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Operating Systems Linux Gentoo cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post 302221664 by era on Tuesday 5th of August 2008 02:02:36 AM
Old 08-05-2008
Another couple of notes about the use of a temporary file.

First off, if you will never use the first few lines of the temp file, might as well throw them away already at the start.

Code:
top -b -n 1 | tail -n +8 > /tmp/salidatop

Secondly, when you are done, you should remove your temporary file. Better yet, remove it even if you are interrupted.

Code:
trap 'rm -f /tmp/salidatop; exit $?' 0
trap 'exit 127' 1 2 3 5 15

Put those lines near the beginning of the script.

Properly speaking, you should probably use something like mktemp to generate a unique, unpredictable temporary file name. There are security issues with using predictable names, and having a static file name means you can't run two instances of the script at the same time.
 

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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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