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General Tech QA/Testing 2 years ago
Posted on 16 Aug 2022, this text provides information on QA/Testing 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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I need to check the existence of an input argument. I have the following script
if [ "$1" -gt "-1" ] then echo hi fi
I get
[: : integer expression expected
How do I check the input argument1 first to see if it exists?
It is:
if [ $# -eq 0 ] then echo "No arguments supplied" fi
The $# variable will tell you the number of input arguments the script was passed.
$#
Or you can check if an argument is an empty string or not like:
if [ -z "$1" ] then echo "No argument supplied" fi
The -z switch will test if the expansion of "$1" is a null string or not. If it is a null string then the body is executed.
-z
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