Homework & Coursework Questions

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1. The problem statement, all variables and given/known data:

what these lines of coding are doing?


2. Relevant commands, code, scripts, algorithms:

[ -z "$SMQUEUE" ] && SMQUEUE="$QUEUE"
[ -z "$SMQUEUE" ] && SMQUEUE=1h

3. The attempts at a solution (include all code and scripts):

I know that it is doing something like setting the system mail queue to 1 hour? but i do not understand what the -z and rest of it is doing?

4. School (University) and Course Number:

Bond 131532

The -z is testing to see if the string is empty.

If the test (square braces) fails then the assignment part after && doesn't execute.