What does -z mean in Bash?
bash
Solution
`-z string`: True if the string is null (an empty string)
See https://www.gnu.org/software/bash/manual/bash.html#Bash-Conditional-Expressions
Problem
I'm looking at the following code: ``` if [ -z $2 ]; then echo "usage: ... ``` (The 3 dots are irrelevant usage details.) Maybe I'm googling it wrong, but I couldn't find an explanation for the `-z` option.