Shell: Difference between revisions
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* stderr to pipe, without stdout: <tt>2>&1 >/dev/null |</tt> | * stderr to pipe, without stdout: <tt>2>&1 >/dev/null |</tt> | ||
==Useful functions== | |||
<syntaxhighlight lang="sh"> | |||
isnumber() { | |||
case "$1" in | |||
''|*[!0-9]*) echo "not a number: $1" >&2 ; return 1 ; ;; | |||
*) return 0 | |||
esac | |||
} | |||
</syntaxhighlight> | |||