subst - commandline tool to replace file contents or file names
This script can be used to replace something in a file or filename by using perl
regular expressions. It can also be used to rename files based on regexes.
Usage
Usage: subst [-M ] [-t] -r 's/old/new/' [ -r '...', ...] [ ... | /regex/]
subst [-M ] [-tR] -m 's/old/new/' [ -m '...', ...] [ ... | /regex/]
Options:
-r replace contents of file(s)
-m rename file(s)
-R recursive (only used in conjunction with -m)
-M load additional perl module to enhance /e functionality.
-t test mode, do not overwrite file(s)
Samples:
- replace "tom" with "mac" in all *.txt files:
subst -r 's/tom/mac/g' *.txt
- rename all jpg files containing whitespaces:
subst -m 's/ /_/g' '/.jpg/'
- decode base64 encoded contents
subst -M MIME::Base64 -r 's/([a-zA-Z0-9]*)$/decode_base64($1)/gem' somefile
- turn every uri into a link
subst -M "Regexp::Common qw /URI/" -r 's#($RE{URI}{HTTP})#link#g' somefile
If is -, STDIN will be used as input file, results will be printed
to STDOUT. -t does not apply for STDIN input.
Substitution regex must be perlish. See 'perldoc perlre' for details.