There is another question about testing command substitution for a particular string. I want to test if a command outputs anything in a single statement, i.e., the equivalent of:
if [[ -n "$(foo)" ]]
in bash. Fish doesn't recognize [[]], and
if [ -n "(foo)" ] # No good, "(foo)" is literal.
if [ -n (foo) ] # Passes only if (foo) == "\n" because of test semantics.
Won't work meaning I have to
set check (foo)
if [ -n "$check ]
Is there a possibility I've missed here?
This should work:
if count (foo) > /dev/null