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string_operations

72 Treffer, Zuletzt geändert: vor 9 Monaten

wo way to get length of the string. The simplest one is ${#varname}, which returns the length of the v... i%l} already exists else mv $i ${i%l} fi done Substitution Another kind of variable mangling y... r 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 n

test

3 Treffer, Zuletzt geändert: vor 9 Monaten

ing with ! -z, or even just the unquoted string alone within test brackets (see Example 7-6) normally w... # This works fine. # The [ ... ] test operator alone detects whether the string is null. # However it ... Chazelas points out, # if [ $string1 ] has one argument, "]" # if [ "$string1" ] has two arg

monitor

1 Treffer, Zuletzt geändert: vor 9 Monaten

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