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string_operations

75 Treffer, Zuletzt geändert: vor 17 Jahren

s will just print the error message. export foo="one" for i in foo bar baz; do eval echo \${$foo:?} one bash: bar: parameter null or not set bash: baz: p... ld cards with them -- since dirname takes exactly one argument (and complains if given more) and basename takes one argument and an optional one which is not a filen... umber of arguments is different from the required one: prints an error message and returns with code one; else returns with code zero. mbfl_argv_from... inting messages to the console This module allows one to print messages on an output channel. Various f

test

3 Treffer, Zuletzt geändert: vor 16 Jahren

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 17 Jahren

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