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Full Discussion: sed error: unescaped newline
Top Forums Shell Programming and Scripting sed error: unescaped newline Post 302426924 by alister on Thursday 3rd of June 2010 09:34:48 AM
Old 06-03-2010
You cannot have an unescaped newline in sed replacement text ($new_license in your example). sed scripting uses the newline just like the shell does, to terminate a command. If you need a newline in the replacement text, you need to precede it with a backslash. Alternatively, if you're using gnu sed and do not care about portability to other sed implementations, you can replace a newline with a \n, in the replacement text (all posix-compliant seds allow this in the regular expression, but not in the replacement ... it is a gnu extension).

This approach is also vulnerable to sed metacharacters in both the regular expression and the replacement text. If old_license and new_license can contain characters that are special to sed, you need to rethink what you are doing. Perhaps use awk's string functions to accomplish the replacement without using regular expressions, or use perl, whose syntax supports quoting interpolated values in regular expressions.

Regards,
Alister
 

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LEARN ABOUT DEBIAN

pct-scanner-script

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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