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That is not true. If getopts is configured to allow "+" to precede option letters, then the opt parameter that comes back during the processing loop has a "+" sign in front of it. So, I just hadn't...

I think I did supply most of the info you mention. I posted script snippets and explanations of how the scripts are used. There are no error messages, and OS and version are, I think, irrelevant,...

I use the "getopts" ksh built-in to handle command-line options, and I'm looking for a clean/standard way to "unset" an option on the command line. I don't know if this is a technical question about...

Right, and variables explicitly declared with "typeset" can't escape their function. For example:

x="outside f"
function f
{
typeset x="inside f"
}
f
print $x
outside f

----------...

Well, I'm in a function here, and I don't want to name clash, so I use typeset. The function is a widely-used utility function. I suppose I could follow some naming convention to help prevent...

Even if I unset the parameter the "Version M 93t+ 2009-05-01" ksh insists on telling me the value is 0:

$ typeset -i x
$ print $x
0
$ unset x
$ print $x
0
$ set |grep x=
x=0

Yeah, but I'm looking to portably implement the other behavior, where an unset parameter is empty.

That was my intention in this case. I wasn't actually looking to format the variable. I'm just using it as a binary flag. If the flag is not empty then my code was assuming that it had been...

I'm getting different behaviors for "typeset -i" on different systems. In one case unset parameters are 0, and in another case they're empty. Is one of these behaviors correct, or is the behavior...

That sounds promising. So:

# losetup /dev/loop0 /path/to/dev_sda.17-Mar-2012
# parted /dev/loop0
...
(parted) p
Model: ...

Linux.

mount -t ext3 -o loop /path/to/dev_sda.17-Mar-2012 /mntI've tried that (actually, -t ext4), but:

mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage...

I backed up my 320GB hard drive to a file with dd:

dd if=/dev/sda of=dev_sda.17-Mar-2012 bs=1048576The main idea was to be able to be able to completely replace my hard drive from this backup if...