Everytime I write a bash script, I have to look up one of these special bash variables and I always forget which one is which. Jotting it down so that I don’t have to google for them the next time.
- $@ – all arguments as a big string.
- $# – number of arguments passed in
- $? – exit code of the last program
- $$ – your process ID
- $! – process ID of last program started w/ ‘&’
