SHELL - HOW TO CHECK IF A VARIABLE IS SET IN BASH - STACK OVERFLOW
Aug 30, 2010 How do I know if a variable is set in Bash? For example, how do I check if the user gave the first parameter to a function? function a { # if $1 is set ? } From stackoverflow.com
SHELL - HOW TO CONCATENATE STRING VARIABLES IN BASH - STACK OVERFLOW
Nov 15, 2010 A bashism is a shell feature which is only supported in bash and certain other more advanced shells. It will not work under busybox sh or dash (which is /bin/sh on a lot of … From stackoverflow.com
HOW TO CONDITIONALLY DO SOMETHING IF A COMMAND SUCCEEDED OR FAILED
It's probably the most common command to use in an if, which can lead to the assumption that it's part of the shell's syntax. But if you want to test whether a command succeeded or not, use … From unix.stackexchange.com
SHELL - DIFFERENCE BETWEEN SH AND BASH - STACK OVERFLOW
Dec 14, 2024 Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel). There are many shell implementations available, like sh, Bash, … From stackoverflow.com
DIFFERENCE BETWEEN ${} AND $() IN A SHELL SCRIPT - SUPER USER
$(command) is “command substitution”. As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…); e.g., $ ls -ld … From superuser.com
WHAT IS THE PURPOSE OF "&&" IN A SHELL COMMAND? - STACK OVERFLOW
Oct 27, 2021 180 command-line - what is the purpose of &&? In shell, when you see $ command one && command two the intent is to execute the command that follows the && only if the first … From stackoverflow.com
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