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Full Discussion: Convert a bash to ash
Operating Systems Linux Ubuntu Convert a bash to ash Post 302936520 by Scrutinizer on Thursday 26th of February 2015 06:11:09 AM
Old 02-26-2015
That looks a bit garbled, this should be:
Code:
[ ! -z "$PS1" ]

Note the spaces around the brackets...

which is equivalent to
Code:
[ -n "$PS1" ]

or
Code:
[ "$PS1" ]

But the logical counterpart of [ ! -t 0 ] would be [ -z "$PS1" ]

However,
Code:
[ ! -t 0 ]

is part of Posix so this should just work in ash. So I do not think this is a bash vs. ash matter.
If it does not work in a certain application, then it should also not work in the case of bash, unless your ash version has a bug...

Last edited by Scrutinizer; 02-26-2015 at 09:39 AM..
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PCT-SCANNER-SCRIPT(1)					      General Commands Manual					     PCT-SCANNER-SCRIPT(1)

NAME
pct-scanner-script - easy scan and create merged DjVu and PDF documents for archiving SYNOPSIS
pct-scanner-script [--help] DESCRIPTION
pct-scanner-script is a bash script and configuration system to easily scan documents and create a digital archiving. It can create DjVu PDF and JPEG outputs, in merged and individual files. It also has a configuration system where different configurations can be defined, making it easy to switch between configurations. Please use pct-scanner-script --help to find all program options, the complete help, and all examples. Features: - auto archiving in merged and individual DjVu, PDF, and JPEG files - auto and manual resume when scanning somehow fails - cascading configuration system, for easy customizing - easy command-line-style bash program, with useful options - archiving made possible with both adf and flatbed scanners - built for productivity and daily use - uses bash, scanadf and other mainstream processing tools - multilanguage commandline output OPTIONS
-h, --help, -? Show summary of options, help, and examples. DEBUGGING
This program is a helper script to easy scan and automated digital document archiving for normal and adf scanners. You can debug this script by running it as bash -x pct-scanner-script [options]. The script is just a nice wrapper for the scanadf, DjVu and PDF tools. SEE ALSO
scanadf(1), AUTHOR
pct-scanner-script and this manual page are written by: Jelle de Jong <jelledejong@powercraft.nl>. March 31, 2009 PCT-SCANNER-SCRIPT(1)
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