Feb 20, 2011 · Cjm's answer is correct, but $? can be used in silly ways in shell scripts, and I'd like to warn against that. A lot of bad shell scripts have a repeated pattern of code:

Unix Shell script to delete all traces of itself after execution through crontab. 0. Printing value of a ...

To extend terdon's answer, I found that Unix / Linux - Shell Basic Operators on Tutorials Point also includes file-related operators (as well as other useful ones).-b file Checks if file is a block …

Jul 4, 2018 · In short, the piece of code will source /etc/bashrc file if it exists, and the existence is verified by [command to which -f is an operator/parameter.

The shell command and any arguments to that command appear as numbered shell variables: $0 has the string value of the command itself, something like script, ./script, /home/user/bin/script …

Jun 19, 2015 · POSIX is about a portable OS API. Some Unix and non-Unix systems get POSIX conformance. There are a number of parts that are optional so you can have different levels of …

This question is a sequel of sorts to my earlier question.The users on this site kindly helped me determine how to write a bash for loop that iterates over string values.

yes, and as I said, you're free to code your project the way you like. But, next to stating your preference to using braces, you linked to an article titled "Why You Should Put Braces around …

See this part of the Advanced Bash Scripting Guide. Some of the contents from the link for user reference as below. Some of the contents from the link for user reference as below. && AND

I can read the numbers and operation in with: echo "First number please" read num1 echo "Second number please" read num2 echo "Operation?" read op but then all my attempts to …