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Shell Programming and Scripting
ksh "typeset -i" and Empty Parameters
Post 302804471 by DGPickett on Wednesday 8th of May 2013 03:51:21 PM
05-08-2013
Yes, one should avoid reading what one did not write, or read very critically! 
One shell / O/S I wandered onto had ksh set to nounset => reject reading nonexistent variables. None of my scripts worked! I had to turn that off quick in my .profile ! Talk about well know defaults, isn't "${some_name_never_set}" well known to be "" ?
It makes code more maintainable to not rely on defaults unless they are well known. For a boolean, you might use set and unset, and skip the content entirely.
---------- Post updated at 03:51 PM ---------- Previous update was at 03:50 PM ----------
AIX writes their own ksh?
One shell / O/S I wandered onto had ksh set to nounset => reject reading nonexistent variables. None of my scripts worked! I had to turn that off quick in my .profile ! Talk about well know defaults, isn't "${some_name_never_set}" well known to be "" ?
It makes code more maintainable to not rely on defaults unless they are well known. For a boolean, you might use set and unset, and skip the content entirely.
---------- Post updated at 03:51 PM ---------- Previous update was at 03:50 PM ----------
AIX writes their own ksh?
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LEARN ABOUT V7
let
let(1) User Commands let(1) NAME
let - shell built-in function to evaluate one or more arithmetic expressions SYNOPSIS
ksh let arg... DESCRIPTION
ksh Each arg is a separate "arithmetic expression" to be evaluated. EXIT STATUS
The following exit values are returned: 0 The value of the last expression is non-zero. 1 The value of the last expression is zero. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), set(1), typeset(1), attributes(5) SunOS 5.10 15 Apr 1994 let(1)