Shell: Difference between revisions
Created page with "==IFS== To set IFS to newline, use IFS=$'\n'. This allows <tt>find</tt> output containing horizontal whitespace to be picked up and used in e.g. <tt>for</tt> loop. * If you ca..." |
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To set IFS to newline, use IFS=$'\n'. This allows <tt>find</tt> output containing horizontal whitespace to be picked up and used in e.g. <tt>for</tt> loop. | To set IFS to newline, use IFS=$'\n'. This allows <tt>find</tt> output containing horizontal whitespace to be picked up and used in e.g. <tt>for</tt> loop. | ||
* If you can use the output with <tt>xargs</tt>, then just use <tt>find</tt>'s <tt>-print0</tt> predicate and <tt>xargs</tt>'s <tt>-0</tt> option. | * If you can use the output with <tt>xargs</tt>, then just use <tt>find</tt>'s <tt>-print0</tt> predicate and <tt>xargs</tt>'s <tt>-0</tt> option. | ||
==Redirects== | |||
* 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> | |||