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Ubuntu - File - Rename replace all occurrences of string within a filename

Replace spaces in a filename with hyphens

for f in * ; do mv "$f" $( echo $f | tr ' ' '-' ) ; done

Rename all files which contain the old sub-string, replacing it with the replacement sub-string

rename old_value replacement_value directory/filename

Rename all files which contain the sub-string 'foo', replacing it with 'bar'

for i in ./*foo*;do mv -- "$i" "${i//foo/bar}";done

Using perl

rename 's/ /-/g' *

rename --help

rename [-v] [-n] [-f] perlexpr [filenames]