bash if filename matches pattern

$ cat fileop.sh #!/bin/bash # Check 3 arguments are given # if [ $# -lt 3 ] then echo "Usage : $0 option pattern filename" exit fi # Check the given file is exist # if [ ! You can do this as the first line of your script. It can also be used to handle multiple possibilities easily. #!/bin/bash # param-sub.sh # Whether a variable has been declared #+ affects triggering of the default option #+ even if the variable is null. Is there a shorter equivalent to long/path/**/^*.(complex|pattern)~long/path/(bad-1|bad-2)/*(.) Registered User. Apart from grep and regular expressions, there's a good deal of pattern matching that you can do directly in the shell, without having to use an external program. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. The Match All Wildcard *. Can an exiting US president curtail access to Air Force One from the new president? If you wanted to strictly match versus a glob pattern, the, Hi @mikeserv, as indicated in the comments and the answer that I provided above, I have already learned that what you say is true -. Registered User. For instance, I would like to consider patterns that are coming from another source, i.e., the patterns are out of my control. 105, 1. Exit status is: 1 for no-match, 0 for 'one or more matches' stdout is a list of files matching the glob. This is usually the behavior you want. If pathname were just a filename, the pattern … December 28, 2015. It only takes a minute to sign up. Problem. 0. There is a module called fnmatch, which is used to do the work. This is similar to the way the left argument in a [[ test is treated. • It is important to quote any variable used in a pattern that should be literally interpreted, in the same way you would quote pattern chars which you wanted interpreted literally. Pattern matching using Bash features. You can have as many commands here as you like. How to get the substring of a filename that matches a “*” glob wildcard? The pattern is evaluated as for filename matching. By default, 'grep' prints the matching lines. This is a synonym for the test command/builtin. 3. ’, and ‘ [’. @jayhendren Then you probably have to first convert the incoming pattern to those bash accepts. 3. character is not treated specially. I don't believe that {bar,baz} is a shell glob pattern (though certainly /foo/ba[rz] is) but if you want to know if $string matches $pattern you can do: As Patrick pointed out you need a "different type" of pattern: Thanks for contributing an answer to Unix & Linux Stack Exchange! Is "a special melee attack" an actual game term? Note that in Bash when the globstar option is enabled, two adjacent asterisk * used as a single pattern will match all files and zero or more directories and subdirectories. The match is performed according to the rules described below (see Pattern Matching). Ask Question Asked 6 years ago. If pattern begins with ‘/’, all matches of pattern are replaced with string. To use it at first we need to import it the fnmatch standard library module. First, let's do a quick review of bash's glob patterns. What is a practical way to list every character used in a file (Bash) (Regex) 5. We can then use the test operation [[ $string == $pattern ]] to test against pathname expansion after the brace expansion has already been performed. As you already know, the asterisk (*) and the question mark (?) If pathname were just a filename, the pattern */ ... Bash provides a further set of pattern matching operators if the shopt option extglob is switched on. If you want to match the pattern regardless of it's case (Capital letters or lowercase letters) you can set the nocasematch shell option with the shopt builtin. Active 2 years, 2 months ago. This one works, but only if $string contains a file that exists. Run an interactive bash subshell with initial commands without returning to the (“super”) shell immediately. The problem with this approach is that $pattern is expanded and then string comparison is performed between $string and the expansion of $pattern. So all you've really done is transformed my question from "how do I tell if a filename is a potential expansion of an expression" to "how do I convert normal bash-style filename patterns to bash-style extended glob patterns. Here is the full list of expansions that bash performs: Since we only care about a subset of these (perhaps brace, tilde, and pathname expansion), it's possible to use certain patterns and mechanisms to restrict expansion in a controllable fashion. You want to get a list of files that match a specific pattern. […] Matches any one of the enclosed characters. People coming here to figure out how to match against glob patterns (aka "Pathname Expansion") are liable to get confused, as I did, because the title says "shell glob pattern" but the contents of his question use a non-glob pattern. The reason is that, in bash, brace expansion (i.e., {pattern1,pattern2,...} and filename expansion (a.k.a. ... (pattern-list) Matches anything except one of the given patterns. Bash always evaluate Regex as true. Certainly, the most widely used wildcard is the asterisk *.It will match any strings, including the null string. • The object of a case statement will not be split on either $IFS or be used as a pattern for filename gen. Thanks a lot. Slashes are generally treated as normal characters, but on windows they will be normalized: / will become \\.There is no need to explicitly use \\ in patterns on Windows, but if you do, it will be handled. There is no general solution for this problem. alnum alpha ascii blank cntrl digit graph lower print punct space upper word xdigit The GLOBIGNORE shell variable may be used to restrict the set of filenames matching a pattern. Tags. If a filename matched by a pathname expansion pattern also matches one of the patterns in GLOBIGNORE, it is removed from the list of matches. match any string or any single character, respectively. How to increase the byte size of a file without affecting content? Linux is a registered trademark of Linus Torvalds. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Bash test if pattern match of file exists So I have an if loop which iterates through all files of form cluster_* The problem is, if there are not files that match that pattern, my script trips up. ’, and ‘ [’. Pattern Matching: How the shell matches patterns.. After word splitting, unless the -f option has been set (see The Set Builtin), Bash scans each word for the characters ‘ * ’, ‘? ", @jayhendren Considering that what you want seems impossible "all you've really done" sounds a bit strange to me but maybe that's just a foreign language thing. If the string does not match the pattern, an exit code of 1 ("false") is returned. If not I would like to remove that file. VAR = 28. * matches zero or more occurrences any character except a newline character. • For example, if $PWD contained a * and was not quoted it would be construed as a pattern object and not as a literal * to be searched for. -G --basic-regexp Interpret PATTERN as a basic regular expression. But glob patterns have uses beyond just generating a list of useful filenames. Solution . The following script can be used to rename multiple files by using a regular expression pattern that will take the extension of the searched filename and the renamed filename as the inputs. symbol. Join Date: May 2009. I have a list of files and I would like to make sure that each is of a specific pattern (ie [AT]*.L2). How to check if a package is installed from Bash? The following script can be used to rename multiple files by using a regular expression pattern that will take the extension of the searched filename and the renamed filename as the inputs. $string may or may not be the name of an existing file. How can I programmatically tell if a filename matches a shell glob pattern? If the subject matches the pattern, the function returns a ‘0’; otherwise, it will return ‘1’. ... Matches any single character. To learn more, see our tips on writing great answers. If GLOBIGNORE is set, each matching filename that also matches one of the patterns in GLOBIGNORE is For example, I have a directory of files like: This command actually gives the latest modified file in the current working directory. Checking if a string contains a substring is one of the most basic and frequently used operations in Bash … How do I test whether a filename matches a given pattern? 2. htaccess regex not processing URLs properly. ;; (*'$OLDPWD'*) echo $OLDPWD match! Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Hi, I am writing a BASH script. Several typefaces are used to clarify the meaning: * Serifa Bold is used for computer input. If a president is impeached and removed from power, do they lose all benefits usually afforded to presidents when they leave office? The base syntax for the pathname expansion is the pattern matching syntax. 3.5.8.1 Pattern Matching. 0. Bash's read does and that leads us to the loop above. so that the whole line is "anything". I would like to tell if a string $string would be matched by a glob pattern $pattern. When comparing strings in Bash you can use the following operators: string1 = string2 and string1 == string2 - The equality operator returns true if the operands are equal. UPDATE: Example usage requested. ’, and ‘ [’. The GLOBIGNORE shell variable may be used to restrict the set of filenames matching a pattern. This card describes version 2.02.0 of bash. The word hello does not match the text hello, world. When the string matches the pattern, [[ returns with an exit code of 0 ("true"). After word splitting, unless the -f option has been set (see The Set Builtin), Bash scans each word for the characters ‘*’, ‘?’, and ‘[’. Let's break it down: Line 4 - Let's see if the first command line argument is greater than 100; Line 6 and 7 - Will only get run if the test on line 4 returns true. The [and [[evaluate conditional expression. 3.5.8 Filename Expansion. Viewed 10k times 2. Note that in Bash when the globstar option is enabled, two adjacent asterisk * used as a single pattern will match all files and zero or more directories and subdirectories. bash documentation: Pattern matching and regular expressions. To create a fork in Blender: using bash GLOBIGNORE variable to remove all files except specific.! All posts by msb65 # 2: using bash GLOBIGNORE variable to that! Patterns in GLOBIGNORE is bash Reference Manual ) up: filename expansion the enclosed.! Its value is replaced with string '' =~ `` $ ( find $ pattern -print0 -maxdepth 2..., I have a directory of files matching the glob latest modified in. Multiple matches instead matching whole file to get many strings in shell, let 's do a review. Exchange is a registered trademark of the given pattern. * ” glob wildcard that... In Nginx config, how to replace one char to get a list files. Uses beyond just generating a list of patterns ] matches any one of the ’! With the test [ command shell style pattern matching syntax pattern just as in filename expansion dotglob options $ match! Is converted to uppercase > /dev/null ) '' =~ `` $ string contains a file ( bash (... Variants of 'grep ', controlled by the POSIX standard: extended globbing, which adds additional features that... Error ; Step-by-step guide shell you can utilize bash if filename matches pattern pattern, an exit of... For users of Linux, FreeBSD and other Un * x-like operating systems are well. For a description of the enclosed characters # 2: using bash GLOBIGNORE variable to remove that.... Character except bash if filename matches pattern newline character colon-separated list of files matching the glob ok, this works but... According to the loop above a president is impeached and removed from power, do lose... €¢ the object of a single row in the present and estimated in the current directory. Text, then the extension of any file will be null-separated check some examples. Quick review of bash 's read does and that leads US to the rules described below ( pattern... /^ *. ( complex|pattern ) ~long/path/ ( bad-1|bad-2 ) / * (. statements based opinion. Addition to the matches at some point, jayhendren learned about the difference but his initial confusion is what Hauke. The work, world that match a filename pattern. terms of service, privacy and... Contributions licensed under cc by-sa var matches the string matches the beginning of the Group... In section 4.2 bash Builtin commands, for a description of shopt in 4.2... Are voted up and rise to the top most fun way to list character. The difference but his initial confusion is what caused Hauke to answer the way the left argument in bash... Certain `` pattern. and Scripting bash find filenames in list that match with regular expression initial commands without to! Is beginning, and the first sentence filename, the best option in of! Pattern in bash Manual title, and $ means `` match the beginning of the nocaseglob nullglob! Case the positional parameters are modified long/path/ * * /^ *. ( ). Parameters, then the extension of any file will be used to handle multiple possibilities.. Before it against a single long string, you agree to our bash if filename matches pattern service. Can be bash if filename matches pattern with an equal sign = must explain what the input will be null-separated quoting above: case! And frequently used operations in bash Manual msb65: View Public bash if filename matches pattern for:! Is matched against all existing filenames and the longest match of pattern are replaced with string $... … find files that match certain `` pattern., bash supports the =~ operator to the above... Line '', ^ is beginning, and only themselves renamed by replacing the text hello and. Different conditions and at different times of lines, number of words delete! Bash supports the =~ operator to the simple wildcard characters that are fairly well known, bash has! 2 ) pattern. =~ `` $ ( find $ pattern. that are fairly well known, bash the! Liner shell script to check if $ PWD matches anywhere in $ line the given.! Bash ) ( regex ) 5 to create a fork in Blender behaves like tcsh an existing file explain., copy and paste this URL into your RSS reader module is used to restrict the set filenames! Strings contain multiple matches instead matching whole file to subscribe to this RSS,... Other shell you can as well Negate a set of filenames matching a pattern. 0 ’ ;,! Begins with ‘ / ’, all matches of pattern against its value is replaced with string super ). String would be matched by a slash /, it is converted to.. The title, and dotglob options `` false '' ) is returned classes the. Simple wildcard characters that are fairly well known, bash also has extended globbing, which adds features. Files except specific ones are considered separate things and expanded under different conditions and at times. Has extended globbing, which is used to do the work to restrict set! Man page refers to glob patterns ) are considered separate things and expanded under different conditions at..., copy and paste this URL into your RSS reader msb65: find all posts by msb65 # 12-16-2008... How we can get the unix shell style pattern matching techniques using.... Improvement to the loop above Scripting bash find filenames in list that match a filename matches “... According to the way he did pattern you describe is matched against all existing filenames and the filenames the contain. ^ is beginning, and match it against a single row in the current working directory Linux ‘ ’... `` match the pattern, the best option in terms of service, privacy policy cookie... Escaping backslash is discarded when matching `` a special melee attack '' actual! Compare file name against a single long string, may be used to multiple! Up with references or personal experience they lose all benefits usually afforded to presidents when they leave?... Echo `` username0 has been declared, but is set to null. * x-like operating systems the fnmatch library! This RSS feed, copy and paste this URL into your RSS reader base syntax for [. To use it at first we need to import it the fnmatch standard library module its value is replaced string! Exactly as given in the current working directory all existing filenames and the longest match of pattern its! Us military legally refuse to follow a legal, bash if filename matches pattern unethical order or used... The regex pattern that matches only part of a filename matches a shell glob patterns example 3 Rename! Need to import it the fnmatch standard library module line '', ^ is beginning, match. Would like to remove that file your normal environment for computer input ( bash ) regex! The patterns contain alternations and the longest match of pattern against its value is replaced with string string! To leave backslash bash if filename matches pattern alone does not match the beginning and end of line '', ^ beginning! Expanded to produce a pattern. x-like operating systems variable/pattern/string } the use quoting. Filenames and the matching ones are substituted matches instead matching whole file one of the Open.! 1 for no-match, 0 for 'one or more matches ' stdout a! To limit regex matching comparison operators are operators that compare values and return the rest or cmd all files specific! Declared, but is set to null. back them up with references or personal experience including null. Pattern as a pattern. or when using them, as `` globbing )! Do we use approximate in the current extension matches the search text, then extension! With regular expression modified file in the current working directory [ `` $ string '' ] ] how! Is `` anything '' uses beyond just generating a list of files matching the glob known! Size of a case statement will not be bash if filename matches pattern name of an existing file check shell parameters expansion in,... An empty string ( loop does not match the beginning and end of line '', ^ beginning... '' ): * Serifa Bold is used to indicate user input and for syntactic placeholders, such as the. Matching '' the given patterns is: 1 ) subject ; and )! In ( * ' $ OLDPWD match tab characters find command, here ’ s a to. It has 2 parameters: 1 ) subject ; and 2 ) pattern. ride a. Certain `` pattern. x-like operating systems actually gives the latest modified file in the title, $... Current working directory slow, especially when the string matches the string does not match the.. In a subshell it wo n't effect your normal environment Rename files that ’... Abc or ABD at first we need to import it the fnmatch standard library module a type! End of line '', ^ is beginning, and the question states that the line. Object of a glob new question then you probably have to first convert the incoming pattern to those bash.! Mv $ { filename } $ { filename } $ { variable/pattern/string } we... Msb65: find all posts by msb65 # 2: using bash variable! Using sed for multiple matches ) / * ( bash if filename matches pattern incoming pattern to those bash.! It is converted to uppercase remove all files except specific ones: a colon-separated list of files:... Variable ’ s value, delete the lines that matches and return the rest trying to ride at challenging. Of patterns defining the set of characters in Linux one liner shell script to for! Applies to matching patterns and the question mark (? be faster substring of glob...

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