![]() If the variables contain spaces or other unusual characters it will probably cause the script to fail. The reason for this is explained by 8jean in another answer. Take particular note of the double-quotes used to wrap the variables. # Symbolic link specific commands go here. So symbolic links may have to be treated differently, if subsequent commands expect directories: if then Second, you will need to pass the full path to the perl one-liner, because it might be in a subdir, so it would be better to use find. Will produce the error message: rmdir: failed to remove `symlink': Not a directory 1 Answer Sorted by: 2 There are two minor issues: First, to pipe file names to a perl one-liner in this way, you need to use the xargs command. running this: ln -s "$ACTUAL_DIR" "$SYMLINK" This is similar in nature to the UNIX grep command, but more powerful as the pattern can be any legal perl function. However, as Jon Ericson points out, subsequent commands may not work as intended if you do not take into account that a symbolic link to a directory will also pass this check.Į.g. File::Grep mimics the functionality of the grep function in perl, but applying it to files instead of a list. I am trying to count the matching character using grep command in Perl script. # Control will enter here if $DIRECTORY doesn't exist. Or to check if a directory doesn't exist: if then Jump to: mysql dotnet framework Axapta PowerPoint c moderated PERL money ASP.NET network VC Next 1. # Control will enter here if $DIRECTORY exists. lookahead in grep on macOS - no, you need to install GNU grep - but their extended syntax doesnt support it either - so you need -P to enable Perl-style. 30 Answers Sorted by: 276 Grep is an awkward tool for this operation. ![]() ![]() name '.txt' xargs perl -i -p -e s/one.a/two.a/g. Case-insensitive: perl -neprint if /foo/i file.txt Replace a substring with another (PCRE sed) perl -pe's/foo/bar/g' file.txt Or in-place: perl -i -pes/foo/bar/g file.txt On Windows: perl -i.bak -pe's/foo/bar/g' file. The atom is supported by BSD extended regular expressions ( egrep, grep -E on BSD compatible system), as well as Perl-compatible REs ( pcregrep, GNU grep -P ). In regex language the tab symbol is usually encoded by \t atom. Second, you will need to pass the full path to the perl one-liner, because it might be in a subdir, so it would be better to use find. The GNU grep(1) also supports Perl-compatible REs as provided by the pcre(3) library. To check if a directory exists in a shell script, you can use the following: if then There are two minor issues: First, to pipe file names to a perl one-liner in this way, you need to use the xargs command. ![]()
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