regex - Replace string in filename in bash -

so have function

ren_barrow(){     file in *.clu             mv -f $file ${file//release/"$1"}     done }

but when run this, can see everyfile ends in .clu renamed.

i want put if statement around mv says if filename contains release in carry on. if not have if statement errors saying

cannot rename: $file , $file same file.

ren_barrow(){     file in *.clu             # if $file grep "release";             mv -f $file ${file//release/"$1"}         # fi     done }

you can have mv command this:

[[ "$file" != *"release"* ]] && mv -f "$file" "${file//release/$1}"

My