[ $var -eq $val ]
What will be the value of $? after the above condition/test if it fails? Can I assume that it will always be 1?
Edit: After reading answers I realized my question wasn't precise. I meant "will it be always 1 if no error occurs?".
Yes, at least as long as an error doesn't occur (so technically "no" in the general case, I guess?). See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html#tag_20_128_14:
The following exit values shall be returned:
0
expression evaluated to true.
1
expression evaluated to false or expression was missing.
>1
An error occurred.
Or https://www.gnu.org/software/bash/manual/bashref.html#Bourne-Shell-Builtins:
Evaluate a conditional expression expr and return a status of 0 (true) or 1 (false).