Hi i am working on somoething , i need to create a if statement which will take multiple variables in \'&&\' and \'||\' combination . for now i am trying to this thi
You can't nest [ ... ]
because [
is a shell command, not a separate syntactic construct. In Bash, you can use the [[ ... ]]
syntactic construct which does support nesting, and in portable sh
you can use the ( ... )
parentheses for precedence:
if ([ $pcount -eq 0 ] && [ $ucount -eq 0 ]) || [ $flag -eq 1 ]
Additional remarks:
[test condition]
doesn't make sense, since the [
operator is already an alias for test
. Write either [ condition ]
or test condition
.
Leave a space before [
and the test, otherwise sh
won't recognize the [
as a command name. [
is a command like any other and is not associated with special parsing rules.
In bash, you can do it like this:
if [[ ( $pcount == 0 && $ucount == 0 ) || ( $flag == 1 ) ]]
then
echo "do stuff"
fi
Alternatively:
if [ "$pcount" -eq 0 -a "$ucount" -eq 0 ] || [ "$flag" -eq 1 ]
then
echo "do stuff"
fi
But, I would recommend the first approach.