Perl RegEx in Mac terminal: grep -p “^([^\t]*\t){2}thepattern\t” textfile.txt doesn’t work

I found on another website the following command

$ sudo perl -MCPAN -e 'CPAN::Shell->notest(install => CPAN::Shell->r)'

This updated all my perl modules and all is back to normal. Not sure why or what, but don't care that it is working now.

You could save the script as ~/Scripts/weasels.sh with any text editor, and run it with bash ~/Scripts/weasels.sh ~/Documents/input\ file.txt. Or if you use TextMate, you can run the script with just ⌘R.

If you want to run the script with weasels instead of bash ~/Scripts/weasels.sh, you can make it executable and add its folder to the path:

mv ~/Scripts/weasels.sh ~/Scripts/weasels
chmod +x ~/Scripts/weasels
echo 'export PATH=~/Scripts:$PATH' >> ~/.bash_profile
. ~/.bash_profile
weasels ~/Documents/input\ file.txt