String Length
${#string}
Substring Extraction
${string:start position[:optional length]}
eg
for file in *.aac; do mv ${file:0:${#file}-4}.aac ${file:0:${#file}-4}.mp3 done
on command line, use tr
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find . -iname \*ilo\* -exec basename {} \;
lon-hcesx24-ilo.cfg
lon-hcesx29-ilo.cfg
lon-hcesx12-ilo.cfg
lon-hcesx19-ilo.cfg
find . -iname \*ilo\* -exec basename {} \; | tr -d '.cfg'
lon-hesx24-ilo
lon-hesx29-ilo
lon-hesx12-ilo
lon-hesx19-ilo