Check out my first novel, midnight's simulacra!
Shell: Difference between revisions
From dankwiki
No edit summary |
No edit summary |
||
| (2 intermediate revisions by the same user not shown) | |||
| Line 6: | Line 6: | ||
* 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: $1" >&2 ; return 1 ; ;; | |||
*) return 0 | |||
esac | |||
} | |||
</syntaxhighlight> | |||
Latest revision as of 05:00, 9 November 2022
IFS
To set IFS to newline, use IFS=$'\n'. This allows find output containing horizontal whitespace to be picked up and used in e.g. for loop.
- If you can use the output with xargs, then just use find's -print0 predicate and xargs's -0 option.
Redirects
- stderr to pipe, without stdout: 2>&1 >/dev/null |
Useful functions
isnumber() {
case "$1" in
''|*[!0-9]*) echo "not a number: $1" >&2 ; return 1 ; ;;
*) return 0
esac
}
