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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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from left to right? or vice versa?
example:
If [! -z "$ foo"] && [$ foo2 -eq 0]; then echo "something" fi
What is the evaluation done first?
[! -z "$ foo"]
or
[$ foo2 -eq 0]
thanks!
In a shell script saying
if [ ! -z "$foo" ] && [ "$foo2" -eq 0 ]; then echo 'something' fi
the first test, [ ! -z "$foo" ] (better written as [ -n "$foo" ]), will run first. The second test will only run if the first test succeeded. If both tests succeed, meaning $foo is a value that is not empty and $foo2 has an arithmetic value equal to zero, then the echo will be executed.
[ ! -z "$foo" ]
[ -n "$foo" ]
$foo
$foo2
echo
The && operator works like similar operators in other languages. The shell implements short-circuit evaluation and will only evaluate the right hand side of && if the left hand side is true.
&&
This particular if statement could also be written without using the if keyword, as
if
[ ! -z "$foo" ] && [ "$foo2" -eq 0 ] && echo 'something'
Although using if ...; then ...; fi is IMHO clearer.
if ...; then ...; fi
Again, the echo would only execute if both preceding tests succeeded.
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