====== BASH - Files - Rename files which contain the old sub-string, replacing it with the replacement sub-string ======

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

<code bash>
rename old_value replacement_value directory/filename
</code>

----

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

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

----

==== Using perl ====

<code bash>
rename 's/ /-/g' *
</code>

As long as you have perl based rename. 

You can check: 

<code perl>
rename --help
</code> 

or 

<code perl>
rename [-v] [-n] [-f] perlexpr [filenames] 
</code>