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In one of my shell script, I'm seeing
if [[ ! -d directory1 || ! -L directory ]] ; then
What does -d and -L option mean here? Where can I find information about the options to use in an if condition?
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$? is the exit status of the most recently-executed command; by convention, 0 means success and anything else indicates failure. That line is testing whether the grep command succeeded. The grep manpage states: The exit status is 0 if selected lines are found, and 1 if not found.
The [[ ... ]] part allows to test a condition using operators. Think of it as an if statement.
The if condition is fulfilled if grep returns with exit code 0 (which means a match). The ! exclamation mark will negate this.
You can do help test which will show most of the options accepted by the [[ command.
You can also do help [ which will show additional information. You can do help [[ to get information on that type of conditional.
Also see man bash in the "CONDITIONAL EXPRESSIONS" section.
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