Difference between ${} and $() in a shell script - Super User
Difference between $ {} and $ () in a shell script Ask Question Asked 10 years, 9 months ago Modified 1 year, 2 months ago

What is the purpose of "&&" in a shell command? - Stack Overflow
Furthermore, you also have which is the logical or, and also which is just a separator which doesn't care what happend to the command before.

bash - What does <<< mean? - Unix & Linux Stack Exchange
it seems < is for passing file (or directory), << @ for passing multiple lines (similar to the banner command in cisco switches; as terminated by a custom string @ in this case), and <<< to pass a string (instead of file). test them yourself with cat and you'll grasp it very quickly.

What is the meaning of $? in a shell script? - Unix & Linux Stack Exchange
When going through one shell script, I saw the term "$?". What is the significance of this term?

bash - Shell equality operators (=, ==, -eq) - Stack Overflow
Shell equality operators (=, ==, -eq) Asked 12 years, 4 months ago Modified 3 years, 10 months ago Viewed 658k times

shell - Difference between sh and Bash - Stack Overflow
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, C shell, Z shell, etc.

What is the $? (dollar question mark) variable in shell scripting?
I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.

Meaning of $? (dollar question mark) in shell scripts
What does echo $? mean in shell programming? true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status of the most recently executed foreground pipeline. By convention an exit status of 0 means success, and non-zero return status means failure. Learn more about exit statuses on wikipedia. There are other special ...

What does $# mean in shell? - Unix & Linux Stack Exchange
What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things.

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