nounset.md

Nounset option

• set -u or set -o nounset
• By default, unset variables are just evaluated as if they were the empty string.
• With this option, BASH stops and fail if you try to use an unset variable.

#### Without Nounset

filename

bash ./examples/options/options_without_nounset.sh

#### With Nounset filename

bash ./examples/options/options_with_nounset.sh

#### DON'T TRY AT HOME rm -rf "$DIRECTORY/*"

### References

• https://www.tldp.org/LDP/abs/html/options.html
• https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
• https://jvns.ca/blog/2017/03/26/bash-quirks/