exit_codes.md

# Exit Codes

• Every command returns an exit code
• 0 = successful
• Non-zero = unsuccessful
• The last command executed in the function or script determines the exit status
• $? = exit code of last command

### Examples

filename

filename

filename

#### Demo

bash ./examples/exit_codes/successful.sh 
echo $?

bash ./examples/exit_codes/explicit_unsuccessful.sh
echo $?

bash ./examples/exit_codes/implicit_unsuccessful.sh
echo $?

### References

• https://www.tldp.org/LDP/abs/html/exit-status.html