Bash shell find out if a variable has NULL value OR not - nixCraft
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shell script - bash string comparison failure, "command not found" - Unix & Linux Stack Exchange
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Using test Command in Bash Scripts
For this assignment, you will use bash create a | Chegg.com
Bash Variables - Javatpoint
Java String to Int Conversion: Methods and Examples
Unix & Linux: Argument string to integer in bash (4 Solutions!!) - YouTube
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Bash see if an input number is an integer or not - nixCraft
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Convert String to Integer in Bash | Delft Stack
String Manipulation in Shell Scripting - GeeksforGeeks
Shell Script to Validate Integer Input - GeeksforGeeks
Unix & Linux: Argument string to integer in bash (4 Solutions!!) - YouTube
How to Argument String to Integer in Bash? – Its Linux FOSS
Bash variables - Things that you probably don't know about it | Unboxing the Cloud
