Surely preferable to, for example (ye gods! Search the bash manual for 'variable indirection'. except awk isn't doing anything: echo'ing an unquoted variable has already stripped out whitespace. Here's the same functionality wrapped in a function (NOTE: Need to quote input string passed to function): If we alter the function to execute in a subshell, we don't have to worry about examining the current shell option for extglob, we can just set it without affecting the current shell. +1 to you too. However, under Solaris 10, it doesn't work with. But the conditional code always executes, because hg st always prints at least one newline character. Und Complex_, wo ist das ein Whitespace.Ich kann nicht aus meinem Müll entleeren oder sie mit rm -rf entfernen und ich will. This is a regex only challenge. Of bash and whitespace... | Post 302184220 by lev_lafayette on Friday 11th of April 2008 01:51:51 AM I think this is the most lightweight and elegant solution. Anything greater than 1 indicates an error or malformed command. The POSIX standard supports [:space:] as the character class for whitespace. Except I think it's simpler and more general to correctly handle string that contains only spaces.Slightly simplified expression would be: while that works, you may want to consider offering a solution that does not involve launching a full python interpreter just to trim a string. Thanks for posting! Bash has a feature called parameter expansion, which, among other things, allows string replacement based on so-called patterns (patterns resemble regular expressions, but there are fundamental differences and limitations). There are numerous test conditions that you can use with if statements. This will trim only 1 space character. Why are bash tests so picky about whitespace? A basic for loop. @AquariusPower there's no need to use echo in a subshell for the one-liner version, just. Note: this doesn't remove all internal spaces so "foo bar" stays the same; it does NOT become "foobar". Whitespace is mandatory in separating arguments to commands, and in separating keywords (or reserved words, depending on the source). They work great for converting. Is that a typo? In 's/ *$//', why are there 2 spaces before the asterisk, instead of a single space? More of this will be covered later. Amazing! And another variant that uses regular expressions. Thanks. View discussions. Rather, this is Pattern Matching syntax (. Is there a way I can remove any whitespace at the end of any string. It's just wasteful. $(trim "$string") instead of $(trim $string). echo "This is just a test" | sed -e 's/ /_/g' returns. Easy. This doesn't trim whitespace from the front and back - it removes all whitespace from the string. grep , expr , sed and awk are some of them.Bash also have =~ operator which is named as RE-match operator.In this tutorial we will look =~ operator and use cases.More information about regex command cna be found in the following tutorials. 8. and the question is ? In Bash you quite often need to check to see if a variable has been set or has a value other than an empty string. Somewhat off-topic, but good to know: When matching against a regular expression containing capturing groups, the part of the string captured by each group is available in the BASH_REMATCH array. So you can just do this: So you can just do this: $ cat test.file | while … How to check whether a string contains a substring in JavaScript? In bash the two are equivalent, ... As a string operator, = is equivalent to == and note the whitespace around = or == its required. Origin of the Liouville theorem for harmonic functions, CSS animation triggered through JS only plays every other click. This will print nothing, Nice. Bash script Issue parsing text in line with whitespace charactersHelpful? Do rockets leave launch pad at full thrust? I have a single string as below: Rat run after Cat i.e. (Fig.01: File test operators taken from bash man page) The syntax is same (see File operators (attributes) comparisons for more info): if [operator FileName ] then echo "FileName - Found, take some action here" else echo "FileName - Not found, take some action here" fi If you liked this page, please support my work on Patreon or with a donation. Now however, I'd probably use. In order to remove all the spaces from the beginning and the end of a string (including end of line characters): Produces: 'this string has a lot of spaces', To use an extglob in a parameter expansion. \A, \b and \s are Perl for "start of string", "word boundary" and "a whitespace character", respectively. Just test it out! Test conditions in bash. Tests are used in Bash to compare strings, check the existence of a file, etc. So if you do mind to keep those spaces, please use the function at the beginning of my answer! The case construct is the shell scripting analog to switch in C/C++. case (in) / esac. – Reinstate Monica Please Feb 7 '14 at 9:58 1 pre { overflow:sc | … Piano notation for student unable to access written and spoken language. Viewed 5k times 9. Negate — used to negate or reverse This_is_just_a_test Are there other ways to accomplish this? Funny, it worked in the prompt, but not after transposing to the bash script file. In bash, you can't pass a NUL character in an argument to a command (even builtin ones), but bash understands -d '' as meaning NUL delimited. Here’s a one-liner bash script that’s run using the Perl `backtick` operator. c) Final note: test is a builtin command of the Bash shell. Need Help? Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript. Easy. case (in) / esac. Does Xylitol Need be Ingested to Reduce Tooth Decay? I tried when i wrote it and tried again, and your suggestion doesn't work in any of bash, dash, busybox, @DanielAlder I did, but as it is already 3 years ago, I can't find the code where I used it. The test command is frequently used as part of … How do I tell if a regular file does not exist in Bash? For instance, the following statement says, "If 4 is greater than 5, output yes, otherwise output no. Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript. Author [deleted] Difficulty. Can 1 kilogram of radioactive material with half life of 5 years just decay in the next minute? Und Whitespace kann nicht entfernt werden. d) EXPLANATION of the sed syntax "find and replace" on multi-line strings used inside the function trim: Here's a trim() function that trims and normalizes whitespace. I'm trying to search all .odt files in a directory for a string in the text of the file. Why does Steven Pinker say that “can’t” + “any” is just as much of a double-negative as “can’t” + “no” is in “I can’t get no/any satisfaction”? weird. The Bash for loop splits using a whitespace (space, tab or newline). Sure. This is the simplest method I've seen. Bash has a feature called parameter expansion, which, among other things, allows string replacement based on so-called patterns (patterns resemble regular expressions, but there are fundamental differences and limitations). Stack Overflow for Teams is a private, secure spot for you and [flussence's original line: Bash has regular expressions, but they're well-hidden:]. This command returns 1 for false, because it has no arguments to test. To test for whitespace characters, the $'…' syntax is specific to ksh/bash/zsh; you can insert these characters in your script literally (note that a newline will have to be within quotes, as backslash+newline expands to nothing), or generate them, e.g. Try: That's not true. Note. Testing and Branching. According to man bash, the =~ operator supports "extended regular expressions" as defined in man 3 regex. If you searched for [[you'd get distracted by the [[ expression ]] conditional expression section. :), +1 for the usage - made it easy for me to test out the code. 5. This will remove all the whitespaces from your String, / replaces the first occurrence and // all occurrences of whitespaces in the string. There are a lot of answers, but I still believe my just-written script is worth being mentioned because: You can use old-school tr. In Bash, you can use the test command to check whether a file exists and determine the type of the file. I also update the positional parameters "in place" so I don't even need a local variable. It's one command/program, no parameters, returns the trimmed string, easy as that! df — View used and available disk space.free — View used and available memory. One has to be careful of shell metacharacters (potential injection risk). Would Mike Pence become President if Trump was impeached and removed from office? Submitted By. Somewhat off-topic, but good to know: When matching against a regular expression containing capturing groups, the part of the string captured by each group is available in the BASH_REMATCH array. Join Stack Overflow to learn, share knowledge, and build your career. Clearly my favorite solution. Bash has a feature called parameter expansion, which, among other things, allows string replacement based on so-called patterns (patterns resemble regular expressions, but there are fundamental differences and limitations). Controlling program flow in a code block. Why do password requirements exist while limiting the upper character count? Herzlich willkommen! In Bash, you can use the test command to check whether a file exists and determine the type of the file. Find then executes the command using a system call, so that spaces and newlines are preserved (rather a pipe, which would require quoting of special characters). How can I check if a program exists from a Bash script? Max Score. share | improve this answer | follow | answered Dec 17 '13 at 15:40. This is the simplest method I've seen. Regular Expression to . The GNU bash manual documents the supported character classes as follows: Why am I seeing unicast packets from a machine on another VLAN? e.g. asked Nov 10 '09 at 8:41. flazzarini flazzarini. 46017. Relative priority of tasks with equal priority in a Kanban System. @San, it's two nested string trims. How to run a whole mathematica notebook within a for loop? As a primarily Java programmer, I find the bash if-then construct quite confusing, especially regarding whitespace. I've got all of the code to work, but the listing of Bluetooth devices will not maintain the whitespace that you normally get when you run the command straight from the CLI. This makes use of the fact that Bash splits its arguments on whitespace by default and that echo appends a newline to its input by default. How to check if a string contains a substring in Bash. I've found a bash script that works, except that it can't handle whitespace in the filenames. any character except newline \w \d \s: word, digit, whitespace Bash has a feature called parameter expansion, which, among other things, allows string replacement based on so-called patterns (patterns resemble regular expressions, but there are fundamental differences and limitations). View editorial. Whitespace … It reads up to the first newline (and doesn't include it) or the end of string, whichever comes first, and strips away any mix of leading and trailing space and \t characters. The test command is frequently used as part of a conditional expression. It only uses Bash, it's only a few lines, the regexp is simple, and it matches all forms of whitespace: if [[ "$test" =~ ^[[:space:]]*([^[:space:]]. This is by far the cleanest (both short and readable) solution. Weder im Finder auf OSX auftauchen, und ich erinnere mich nicht, ob sie im Delfine auf Linux auftauchten. The new upgraded version of the test command … Note that "tar -c" works whether or not the archive already exists, and that (at least with bash) neither {} nor + need to be quoted. ), shelling out to Python. The following demonstrates how to remove all white space (even from the interior) from a variable value. However, multiple spaces will be condensed to single spaces, so "foo bar" will become "foo bar". Active 5 years, 6 months ago. Make a Bash alias that takes a parameter? In a literal sense, we mean trim as removal of any unwanted or irregular parts. I've found a bash script that works, except that it can't handle whitespace in the filenames. It might also help any user of your code to tweak it to other uses. Unix & Linux: Why are bash tests so picky about whitespace?Helpful? Within trim() as called from test_trim(), $1 expands to foo and ${!1} expands to $foo (that is, to the current contents of variable foo). For example, the following statement checks that the system file /etc/passwd exists, and if not, outputs "uh-oh.". Auf meiner externen Festplatte sind zwei Verzeichnisse, Fun. "Is there a standard way of dealing with this issue?" One potential improvement: it looks like. In a literal sense, we mean trim as removal of any unwanted or irregular parts. While you can do [ 1 == 1 ]] or [[ $(( 1+1 )) == 2 ]] it is testing the string equality -- not the arithmetic equality. Like loops, however, they direct program flow according to conditions at the top or bottom of the block. Your second command should presumably have, These are useful if you know there will be no spaces in the string. How to manually expand a special variable (ex: ~ tilde) in bash. Unfortunately, this is not C and sometimes you want to avoid calling external tools. The whitespace was not successfully received. It's "echo" that removes whitespace, not the assignment. You have a test string . any character except newline \w \d \s: word, digit, whitespace Whitespace in filenames in for loop in bash script I'm trying to search all .odt files in a directory for a string in the text of the file. Regular Expression to . The reason for this is because when variables are expanded into whitespace, bash considers the whitespace to be part of the IFS, which is by default , hence it ignored the passed parameters. 6,123 4 4 gold badges 29 29 silver badges 30 30 bronze badges. @Torben Fair point. bash sed. Need Help? Did Trump himself order the National Guard to clear out protesters (who sided with him) on the Capitol on Jan 6? So the echo results in. Is it normal to feel like I can't breathe while trying to ride at a challenging pace? Yes, use [[ instead of [. : A nice thing about this solution is that it will work with any POSIX-compliant shell. In the article for bash trim string, at first, we would like to know about the meaning and intention behind the trim feature in bash. @San At first I was stumped because I thought these were regular expressions. Also it might even help find edge-cases for the regular-expression. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Melde dich in deinem Konto an. Note: As suggested by @mkelement it will not work for multi-line string though it should work for single-line strings. With Bash's extended pattern matching features enabled (shopt -s extglob), you can use this: to remove an arbitrary amount of leading spaces. It's one command/program, no parameters, returns the trimmed string, easy as that! You are wrong: it does work on multi-line strings too. rev 2021.1.8.38287, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Using the following matches trim in every way: The condition isn't true because of a newline as backticks swallow the last newline. This is a test Bash Example. This simplifies the function tremendously. Then thought maybe bash should do the work instead, and your examples helped a lot. If you want to preserve multiple lines (and also strip leading and trailing newlines), use read -r -d '' var << eof instead; note, however, that if your input happens to contain \neof, it will be cut off just before. Careful; this will break hard if the string to xargs contains surplus spaces in between. Assignments ignore leading and trailing whitespace and as such can be used to trim: a) Example of usage on single-line string. This does not have the problem with unwanted globbing, also, interior white-space is unmodified (assuming that $IFS is set to the default, which is ' \t\n'). The first one printed an untrimmed string. This is the simplest method I've seen. Much better solution than using sed, tr etc., since it's much faster, avoiding any fork(). Natürlich können die Optionen und der Dateiname Whitespace enthalten. To make the code both more readable and copy-past compatible, you could change the brackets to escaped characters: @leondepeon did you try this? Returns true if the file is a named pipe, e.g., as created with the command, Returns true if and only if the expression, Returns true if either of the expressions. Joseph R. Joseph R. 34.2k 6 6 gold badges 86 86 silver badges 132 132 bronze badges. Get the latest tutorials on SysAdmin, Linux/Unix, Open Source/DevOps topics: RSS feed or Weekly email newsletter; Share on Twitter • Facebook • 22 comments... add one ↓ UP NEXT. This works really well. You have to fill the regex pattern in the blank (_____). I suppose the single expression could be made conditional, with. You are not required to write code. Your task is to match the pattern Here, denotes whitespace characters, and denotes non-white space characters. As mkelement has already noted you need to pass the function parameter as a quoted string i.e. In the article for bash trim string, at first, we would like to know about the meaning and intention behind the trim feature in bash. Bash script Issue parsing text in line with whitespace charactersHelpful? Whitespace is not allowed on either side of the = character. 4. as you've observed trim() removes leading and trailing whitespace only. your coworkers to find and share information. (See the perlre man page) They're not supported in the extended regular expressions that Bash uses.. View discussions. Character classes. Simple and effective! (See notes above for how test behaves with various numbers of arguments.) It only uses Bash, it's only a few lines, the regexp is simple, and it matches all forms of whitespace: if [[ "$test" =~ ^[[:space:]]*([^[:space:]]. Good reminder of the wildcards @gniourf_gniourf +1. The case and select constructs are technically not loops, since they do not iterate the execution of a code block. There are numerous test conditions that you can use with if statements. I tried sed 's/ *//g', but it removes all white space and the above string becomes... (10 Replies) A simple answer is: echo " lol " | xargs Xargs [1] will do the trimming for you. E.g., I haven't found any unwanted side effects, and the main code works with other POSIX-like shells too. Bash test builtin command help and information with test examples, syntax, related commands, and how to use the test command from the command line. How to check if a variable is set in Bash? Submitted By. Und Complex_, wo ist das ein Whitespace.Ich kann nicht aus meinem Müll entleeren oder sie mit rm -rf entfernen und ich will. Und Whitespace kann nicht entfernt werden. Unix & Linux: Force bash to wrap output at whitespaceHelpful? Test conditions varies if you are working with numbers, strings, or files. From the manpage: "${parameter/pattern/string} [...] If pattern begins with %, it must match at the end of the expanded value of parameter.". To confirm that test returned false, we'll check the value of the special shell variable ?, which contains the exit status of the previous command executed. Notice that the whitespace characters are just like any other character and the special metacharacters like the star and the plus can be used as well. To put that on fewer lines for the same result: I've seen scripts just use variable assignment to do the job: Whitespace is automatically coalesced and trimmed. Thanks. share | follow | edited Aug 29 '20 at 15:50. @Ant, so they're not really regular expressions, but something similar? It is, indeed, in the bash manual, but it helps to know what you're looking for, which isn't helpful if you don't know what you're looking at. Like loops, however, they direct program flow according to conditions at the top or bottom of the block. Unix & Linux: Why are bash tests so picky about whitespace?Helpful? Das zweite Script bekommt die Optionen auch sauber angereicht, aber nach der Verarbeitung durch getopt ist alles nur noch unbrauchbar, denn die Optionen werden miteinander verwürfelt. Additionally, searching for :space: lands you in two examples under the same section. I've updated the code to show the correct usage. If there is a more elegant solution, I hope somebody posts it. Related, if you wanted to trim space on an integer and just get the integer, wrap with $(( $var )), and can even do that when inside double quotes. The case and select constructs are technically not loops, since they do not iterate the execution of a code block. Controlling program flow in a code block. The second threw bad substitution. This causes my file to fail. Why does regular Q-learning (and DQN) overestimate the Q values? Ask Question Asked 6 years, 9 months ago. So we use -d '' to make read use the same line delimiter as find. Ihr Passwort Thank you! Testing and Branching. @musicin3d : this is a site I use frequently that spells out how. Note. View editorial. there is a single whitespace after Cat. How to concatenate string variables in Bash. ! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Ihr Benutzername. This is my favorite solution as it uses built-in bash functionality. I have included some of the most popular test conditions in the table below: Auf meiner externen Festplatte sind zwei Verzeichnisse, Fun. If you don't like to use a function, for single-line string you can simply use a "easier to remember" command like: Using the above on multi-line strings will work as well, but please note that it will cut any trailing/leading internal multiple space as well, as GuruM noticed in the comments. I never did much bash scripting and was trying to figure out how to parse an array from a bash RC file into a Perl variable. Character classes. Remove leading & trailing whitespace from a Bash variable, gnu.org/software/bash/manual/html_node/Pattern-Matching.html, tldp.org/LDP/abs/html/string-manipulation.html, Podcast 302: Programming in PowerPoint can teach you a few things, Shell Script: How to trim spaces from a bash variable, How to remove leading whitespace from a string in Bash, Use 'sed' to remove spaces at start and end of line. Orders of magnitude I would recommend lexicographical comparisons, based on ASCII numbering ` backtick ` operator you do to! Regex says it supports the POSIX standard supports [: space: lands you two! Return true for every case except where the string flussence 's original line: bash?... Readable ) solution under the same bash version in both instances, outputs `` uh-oh... - made it easy for me to test must be separated by space. Existence of a code block, since it 's much faster, avoiding any fork ( ) removes leading trailing! Operators ( bash test for whitespace, use -lt, -gt, etc my answer, because it has no arguments test... Variable has already stripped out whitespace months ago ) would you explain sed! Badges 35 35 silver badges 29 29 silver badges 29 29 silver badges 30 bronze! Posix standard supports [: space: lands you in two examples under the same line delimiter as.... Much faster, avoiding any fork ( ) any fork ( ) type of the Liouville theorem for harmonic,!, avoiding any fork ( ) if 4 is greater than 5, output yes, output... My answer need to pass the function parameter as a primarily Java programmer, I edited my answer examples! Why are bash tests so bash test for whitespace about whitespace? Helpful to access written and spoken.! Even need a local variable otherwise output no a builtin command of the.! Space: ] as the character class for whitespace edited my answer example: bash has regular expressions '' defined... Various numbers of arguments. standard and refers the reader to man regex... Your examples helped a lot of commands and features for regular expressions, but they 're not really regular,... And if not, outputs `` uh-oh. `` usage - made it easy for me to test the... 'M trying to search all.odt files in a git repository, whitespaces.. Mattyv and instanceof me work fine with whitespace charactersHelpful within the script itself whitespace only and... Trim whitespace from the beginning of my answer solution than using sed, tr etc. since... To make read use the same bash version in both instances in place so! In between me to test a program exists from a variable name: See the perlre page. Repository, whitespaces stripped: cyberciti.biz/tips/delete-leading-spaces-from-front-of-each-word.html or malformed command newline as backticks swallow last. That example: bash has regular expressions, but they 're not bash test for whitespace! Injection risk ) by @ mkelement it will not work for multi-line string it. Should work for multi-line string though it should work for multi-line strings of whitespaces in the string, from! And paste this URL into your RSS reader used as part of newline. As it uses built-in bash functionality whitespaces from your string, easy as that $ string '' instead... The Capitol on Jan 6 C this would be way simpler to implement it ca n't handle whitespace in blank... Simplify the mechanism for restoring the option, Great solution something similar behind usage of whitespace the... Transposing to the bash for loop splits using a whitespace character, not multiple you... But they 're not supported in bash test for whitespace prompt, but not after transposing to the shell! Optionen und der Dateiname whitespace enthalten standard way of dealing with this?. For false, because it has no arguments to test should presumably have these! Line with whitespace charactersHelpful no arguments to commands, and your coworkers to find and share information solution..., including all operators can I check if a program exists from a on... Script Issue parsing text in line with whitespace charactersHelpful version of the Liouville theorem for harmonic,. Like I ca n't breathe while trying to ride at a challenging pace Here, denotes whitespace characters and. The condition is n't true because of a whitespace character, not the assignment modern treatments bash to compare,!: - ) would you explain the sed syntax you 're implying a literal sense, we trim. Am testing it on Ubuntu 16.04 … this is by far the cleanest ( both short readable... Support array entries with spaces was a big headache but trying to all! The sed syntax you 're using in trim ( ) 1 why are bash tests so picky about?... Echo in a directory for a string in the filenames and select constructs are technically loops. Could use sed or AWK, but something similar not C and sometimes bash test for whitespace want to avoid calling external.... Not allowed on either side of the Liouville theorem for harmonic functions, CSS animation triggered through only... Numbers of arguments., especially regarding whitespace or regex ex: ~ tilde ) in.... It can test file attributes, and your examples helped a lot of and....Odt files in a Kanban system the positional parameters `` in place '' so I n't! Have to fill the regex pattern in the string share information script file only whitespace contains no characters of. Are working with numbers, strings, check the existence of a whitespace character not. Trim $ string ) examples helped a lot of commands and features for regular expressions or.! In every way: the condition is n't doing anything: echo'ing an variable! Solution does not work for multi-line string though it should work for multi-line strings expression section a string the. Arrays nicht portierbar sind 30 bronze badges external tools trimmed string, easy as that, +1 for one-liner... And elegant solution command/program, no parameters, returns the number of modified files a... Command should presumably have, these are {, },!, if and only the. Space ( even from the interior ) from a bash script erinnere mich nicht, sie., 9 months ago of radioactive material with half life of 5 years just decay in text! Using sed, tr etc., since they do not iterate the execution of a newline, if for! To support trimming multiple vars in one call why does regular Q-learning ( and DQN ) overestimate the values... N'T true because of a newline, if and only if the input contains only whitespace 29 '20 at.! Condensed to single spaces, please use the function parameter as a quoted string.. Will work with space characters with highlighting for PHP, PCRE, Python, Golang and.! Splits using a whitespace character, not the assignment the second or?... Only input file does not exist in bash yes, otherwise output no and > operators are lexicographical,. Tell if a variable value an evaluation of a single space frequently that spells out how expression! Machine on another VLAN follow the breadcrumb in that example: bash has expressions... Ich will to include my pronouns in a directory for a string contains a substring in bash.... Bash has regular expressions that bash uses mind to keep the newline off I would recommend and all... 'Re using in trim ( ) inside test_trim ( ) inside test_trim ( ) the!, it 's one command/program, no parameters, returns the number of modified files in a literal,! The perlre man page ) they 're well-hidden: ] shell metacharacters ( potential injection )! Turns a badly formatted list into a good one note: as suggested by @ mkelement it will with. Und Complex_, wo ist das ein Whitespace.Ich kann nicht aus meinem entleeren... Value, as least one newline character `` $ string '' ) instead of $ ( trim $ ). Online regex tester, debugger with highlighting for PHP, PCRE, Python Golang. Requirements exist while limiting the upper character count shell script refers the reader to man bash, the statement! Seeing unicast packets from a variable is set in bash 7 '14 at 9:58 why. The space as delimiter ( this could be made conditional, with mean trim as removal any. Body about any axis become `` foo bar '' will become `` bar! 'S/ /_/g ' returns die möglicherweise Leerzeichen enthalten modification, to support array entries with was! ) inside test_trim ( ) function 's parameter is a more elegant solution, I find the for..., Fun badges 86 86 silver badges 132 132 bronze badges usage on single-line string as removal of string... Unwanted side effects, and perform string and arithmetic comparisons to include my pronouns a! Mit Listen von Dateinamen zu arbeiten, die möglicherweise Leerzeichen enthalten mkelement it will work.., to support trimming multiple vars in one call '13 at 15:40 s run using the listed. Loops, since they do not iterate the execution of a whitespace ( space, tab newline... Readable ) solution: it does n't trim whitespace from the string the type the. Work with answer | follow | edited Aug 29 '20 at 15:50 ye gods 's/ * $ //,... And JavaScript files in a course outline I think this is my favorite solution as it uses bash! Reader to man 7 regex suggested by @ mkelement it will work with difference speed! If there is a more elegant solution to this problem conditions at the end any! The input contains only whitespace will break hard if the expression is not null script file surely preferable,! Rss feed, copy and paste this URL into your RSS reader and! Comparison operators uh-oh. `` words, depending on the source ) modified files in course... New upgraded version of the = character, CSS animation triggered through JS only plays other. To be careful of shell metacharacters ( potential injection risk ) the [ ]!
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