Get the extension of file

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Extract filename and extension in Bash 35 answers

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You may use awk,

awk -F. '{print $NF}' file

or

sed,

$ echo 'info.tar.tbz2' | awk -F. '{print $NF}'
tbz2
$ echo 'info.tar.tbz2' | sed 's/.*.//'
tbz2

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