The z command is boken due to the null character checks at the begining of
the function.  It limits the command to exactly a one character argument. 
So you cannot specify a page greater than 9, nor prefix a number with + or
- like you're supposed to be able to.

The line in question is 692 of cmd1.c
https://git.sdaoden.eu/cgit/s-nail.git/tree/cmd1.c#n692

I commented the check out and the z command works correctly.  I am not
sure what the check is supposed to accomplish so I can't offer a suggested
fix.

Tim.


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