Shell/Bash shortcut for bulk renaming of files in a folder

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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.

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