Bash Match Pattern Examples for Scripting

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1. Bracket expression description [xyz] the "normal" bracket expression, matching either x, y or z [x-z] a range expression: matching all the characters from x to y linuxtopia books – bash guide guide for beginners – pattern matching using bash features from: vikram goyal <viki bol net in> to: redhatlist <redhat-list redhat com> subject: bash pattern matching; date: thu feb 13 08:33:07 2003

2. Bash features this text is a brief description of the features that are present filename expansion: a shorthand for specifying filenames matching patterns 3581 pattern matching any character that appears in a pattern, other than the special pattern characters described below, matches itself the nul character may linuxtopia books – advanced bash shell scripting guide – parameter substitution first match of pattern, within var replaced with replacement

3. The manpage for bash says: ${parameter#word} ${parameter##word} remove matching prefix pattern the word is expanded to produce a pattern just as in pathname i use this script to convert all the png files in a directory to jpg files if i want to convert not just png files, but also tif, gif and bmp files into jpg, how #!/bin/bash # a shell script to backup mysql, webserver and files to tape for example, you can match tar pattern using the following syntax: [tt][aa][rr]

4. #!/bin/bash # param-subsh # whether a variable has been declared # affects first match of pattern, within var replaced with replacement from: vikram goyal <viki bol net in> to: psyche <psyche-list redhat com> subject: bash pattern matching; date: thu, 6 feb 2003 19:39:09 0530 bash case example 2 pattern match in a file this example prints the number of lines,number of words and delete the lines that matches the given pattern

5. Bash pattern matching info catalog bash filename expansion 3581 pattern matching any character that appears in a pattern, other than the hi guys, my script has the 'case' block as shown: case "$env_id" in at10[1-9] | at1[10-99] command-list;; * it matches the pattern in the variable $string, and replace only the first match of the pattern with the replacement $ cat firstmatchsh #! /bin/bash filename="bash

6. I would like to write a simple if/else that checks if a variable holds a pattern from the bash docs it seems you can check if it equals = or not != aside from the =~ operator, almost every major feature is consistent between ksh88, ksh93, mksh, zsh, and bash ksh93 also adds a large number of unique pattern matching i was confused that bash would expand some patterns nicely to match filenames when i was on the commandline, but the same pattern would not work from inside a shell

7. Does anyone know a bash command to check for a pattern match within a string for example, if i have a string "1 2 3 4 5" i need a function bash reference manual 3581 pattern matching any character that appears in a pattern, other than the special pattern characters described below, matches itself extended globbing as described by the bash man page: ?pattern-list matches at the end of the file name is the part that ends up not matching the "!" pattern