Shell/Bash shortcut for bulk renaming of files in a folder
I would suggest something like this:
for i in *-doc-*.txt; do mv "$i" "${i/*-doc-/doc-}"; done${i/*-doc-/doc-} replaces the first occurrence of *-doc- with doc-.
If you need to do more than one replacement (see comment number 1), you need to use the ${var//Pattern/Replacement} variant. If you need to replace the beginning of the name you need to use ${var/#Pattern/Replacement}, if you need to replace the end (ie: the extension) you need to use the ${var/%Pattern/Replacement} form.
See Shell Parameter Expansion for more details. This expansion is bash specific.
There is prename, that allows you to use REGEX:
prename 's/^.*-doc-(.*\.txt)$/doc-$1/' *.txtUse the option -n to simulate:
prename -n 's/^.*-doc-(.*\.txt)$/doc-$1/' *.txtNote: This is the shipped as rename in many Linux distributions, but not in all of them -- so I'm using the canonical name for the utility that comes with Perl.