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- linux - What does $@ mean in a shell script? - Stack Overflow
What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@
- 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
- 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 $(date +%B) txt -rwxr-xr-x 1 Noob Noob 867 Jul 2 11:09 July txt ${parameter} is “parameter substitution” A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter
- shell - How to concatenate string variables in Bash - Stack Overflow
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 distros), or certain other shells like the bin sh provided on FreeBSD
- How do I get into a Docker containers shell? - Stack Overflow
docker debug <container or image> It allows you to get a shell (bash fish zsh) into any container It also works for stopped containers and images Essentially it's a replacement of docker exec -it <container> sh but with more features and less constraints (eg the debug shell has an install command to add further tools)
- How to check if a string contains a substring in Bash
The -- argument is pure POSIX paranoia, used to protected against input strings similar to options, such as --abc or -a Note: In a tight loop this code will be much slower than using internal Bash shell features, as one (or two) separate processes will be created and connected via pipes
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
Shell equality operators (=, ==, -eq) Asked 11 years, 7 months ago Modified 3 years, 1 month ago Viewed 634k times
- How do you run multiple programs in parallel from a bash script?
To run multiple programs in parallel: prog1 prog2 If you need your script to wait for the programs to finish, you can add: wait at the point where you want the script to wait for them For example: prog1 prog2 # (do other things while 'prog1' and 'prog2' carry on # in the background) # (Now we need the results of 'prog1' and 'prog2' # before continuing, so let's wait for them to
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