$? in shell script

$? it give the exit status of last command

$$ in shell script

$$ is the process ID (PID) of the script itself.

$BASHPID is the process ID of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result.

Source: unix.stackexchange.com

Similar codes

-1 vote101 views1 answer
Install protobuf windows
Shell/Bash
0 vote97 views1 answer
Default side-by-side NDK installation is not found.
Shell/Bash
0 vote101 views1 answer
React native run android shows deprecated items
Shell/Bash
-1 vote107 views1 answer
Docker install in centos u7
Shell/Bash
16 votes111 views3 answers
Ubuntu navigate to directory in windows
Shell/Bash
0 vote100 views1 answer
Git ignore folder except one file
Shell/Bash
2 votes100 views1 answer
ModuleNotFoundError: No module named 'libs.resources'
Shell/Bash
1 vote96 views1 answer
How to download github code in terminal
Shell/Bash
0 vote102 views1 answer
Why lubuntu 20.04 freezes
Shell/Bash
5 votes99 views3 answers
Install chromedriver linux command line
Shell/Bash