linux - Removing everything but filename extension -

this question has answer here:

let's have string:

x=file.tar.sh

i know how remove last n-characters. (removing last 3 characters:

${x: -3}

but doesn't work files different suffix lengths. (len .tar != len .sh)

i tackle removing until last dot. i've tried this:

${x##.}

this removes longest matching until "." somehow returns full string without removing anything?

try this:

x=file.tar.sh echo ${x##*.}

this print sh

if want tar.sh, then:

echo ${x#*.}

here * matches set of characters before occurrence of .

Braziel