==
Quelle((http://www.softpanorama.org/Scripting/Shellorama/Reference/string_operations_in_shell.shtml))
===== Length Operator =====
There are two ... it in a function file. We will call it functions.sh, the sh meaning shell scripts.
$ pg functions.sh
#!/bin/sh
# functions.sh
# main script functions
is_it_a_directory()
{
# is_it_a_directory
====== Bash Shell Tests ======
Quelle((http://tldp.org/LDP/abs/html/comparison-ops.html))
===== Other... tring is null ===
<code>
#!/bin/bash
# str-test.sh: Testing null strings and unquoted strings,
#+ bu... is null."
fi # Wrong result.
# Shows $string1 as not null, although it was not init... o output)
# No, that's not it.
# Apparently && and || "short-circuit" while -a and -o do not.
</code>
