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# parameter expansion

**getting only the file name without extension**\
\*\*\*\*`${FILENAME%.*}`

**getting only the extension**\
\*\*\*\*`${FILENAME##*.}`

**remove first folder (until / )**\
\*\*\*\*`${FILENAME#*/}`

**getting filename**\
\*\*\*\*`${PATHNAME##*/}`

Much more on <https://wiki.bash-hackers.org/syntax/pe#substring_removal>