errexit.md

Errexit option

• set -e or set -o errexit
• By default, when a program fails, Bash will just keep running.
• With this option, BASH exits immediately if a simple command, a pipeline or a compound command (loop, conditionals, command groups) returns a non-zero status.
• There are some exceptions.

#### Without Errexit filename

bash ./examples/options/options_without_errexit.sh
echo $?

#### Without Errexit - Alternative filename

bash ./examples/options/options_without_errexit_alternative.sh
echo $?

#### With Errexit filename

bash ./examples/options/options_with_errexit.sh
echo $?

#### With Errexit - Exceptions

• The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of the test in an if statement, part of any command executed in a && or || list except the command following the final && or ||, any command in a pipeline but the last, or if the command’s return status is being inverted with !.

filename

bash ./examples/options/options_with_errexit_exceptions.sh
echo $?

Weirdness of -e

filename

bash ./examples/options/options_with_weirdness.sh
echo $?

### References

• https://www.tldp.org/LDP/abs/html/options.html
• https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html