Hi Bakunin, this is not right. Again, this is mixing up shell keywords ( which [[ ... ]] are) and a shell utility (which is the case with [ ... ]) . There really is no reason to use double quotes here, unless you want to combine whitespace separated fields (which is not the same as field splitting) or prevent pattern matching together with the == operator or regex matching together with the =~ operator (if available).

From man bash

Quote:

Word splitting and pathname expansion are not performed on the words between the [[ and ]]

and man ksh (both 88 and 93):

Quote:

Field splitting and file name generation are not performed on the words between [[ and ]]

This syntax is incorrect and not part of POSIX. Correct POSIX syntax would be:

Code:

while [ -z "$groups" ] || [ -z "$date1" ] || [ -z "$n" ] || [ -z "$email" ]; do