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string_operations

624 Treffer, Zuletzt geändert: vor 17 Jahren

est possible match from the right export $foo="this is a test" echo ${foo%%t*is} NOTE While the # and % identifiers may not see... rator Function Example ${foo:-bar} If $foo exists and is not null, return $foo. If it doesn't exist or is null, return bar. export foo="" echo ${foo:-one} one echo $foo ${foo:=bar} If $foo exists and is not null, return $foo. If it doesn't exist or is null, set $foo to bar and return bar expo... :=one} one echo $foo one ${foo:+bar} If $foo exists and is not null, return bar. If it doesn't exist, or is null, return a null. export foo="this is

test

74 Treffer, Zuletzt geändert: vor 16 Jahren

is equal to <code>if [ "$a" == "$b" ]</code> This is a synonym for =. Note The == comparison op... truct. See Example 27-11 for an application of this comparison operator. ---- -z string is null, that is, has zero length <code> String='' # Zero-length ("null") string vari... kets (see Example 7-6) normally works, however, this is an unsafe practice. Always quote a tested string.

monitor

2 Treffer, Zuletzt geändert: vor 17 Jahren

<code> #!/bin/bash # File Monitor # function list () { #ls -l #sleep 1 # more elegant: watch -n 1 "ls -l" } while true; do list | grep $1 done </code>