commandliners

Thanks to the short-circuit behaviour of the && operator, if-statements can be replaced by:

[[ test ]] && if_true_do_this || otherwise_do_that

So, instead of writing:

if [[ "$1" == "$2" ]]; then
echo "$1 equals $2"
else
echo "$1 differs from $2"
fi

One can write:

[[ "$1" == "$2" ]] && echo "$1 equals $2" || echo "$1 differs from $2"

Braces can be used to run more than a single command:

[[ test_condition ]] && { true_stuff_1; true_stuff_2; } || { false_stuff_1; false_stuff_2; }

Via | commandlinefu