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I use ${parameter#word} and ${parameter%word} to remove prefix and postfix of string.

$ x=2012-hello.jpg
$ y=${x#*-}
$ z=${y%.*}
$ echo $z

How can I do them at once instead of two.

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I don't think that's possible. – Daniel Beck Jan 7 '12 at 15:24
up vote 4 down vote accepted

It is not possible with parameter expansion, but it is possible with regular expression matching:

[[ $x =~ .*-(.*)\.jpg ]] && echo ${BASH_REMATCH[1]}
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If you are OK with using sed instead of parameter expansion:

$ z="$(sed -e 's/.*-\(.*\)\..*/\1/' <<<"$x")"
$ echo "$z"
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