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string_operations
154 Treffer, Zuletzt geändert:
If $foo exists and is not null, return $foo. If it doesn't exist or is null, return bar. export foo... If $foo exists and is not null, return $foo. If it doesn't exist or is null, set $foo to bar and ret... } If $foo exists and is not null, return bar. If it doesn't exist, or is null, return a null. export... message"} If $foo exists and is not null, return its value. If it doesn't exist or is null, print the
test
9 Treffer, Zuletzt geändert:
[ ... ] # If a string has not been initialized, it has no defined value. # This state is called "nul... ng result. # Shows $string1 as not null, although it was not initialized. echo # Let's try it again. if [ -n "$string1" ] # This time, $string1 is quo... one detects whether the string is null. # However it is good practice to quote it (if [ "$string1" ]).
 
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