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Full Discussion: Explain following sed syntax please
Top Forums Shell Programming and Scripting Explain following sed syntax please Post 302413783 by hukcjv on Saturday 17th of April 2010 05:19:22 AM
Old 04-17-2010
Explain following sed syntax please
Thanks to this forum I have managed to work out a solution to my problem and actually understand most of it, but one thing is confusing me and I am sure someone here can explain.

I need to insert a piece of txt into a file. This txt is

awk '{ sub(/$/,"\r"); print }' $JCL_WBB50103_EFTOUT > $JCL_WBB50103_EFTOUT".crlf"

I wrote the following test script

Code:
BLOB="awk '{ sub(/$/,\"\\\r\"); print }' \$JCL_WBB50103_EFTOUT > \$JCL_WBB50103_EFTOUT\".crlf\""
export BLOB


sed "/jcl_ikjeft01 WBB50103/a\\
        $BLOB" /home/iis1/EFTONCR > /home/iis1/tmp

The bit I don't understand is why I need 2 (\\) before the \r statement. I would have thought 1 would have done the trick

Thanks in advance

Chris
 

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LEARN ABOUT DEBIAN

edos-rpmcheck

EDOS-RPMCHECK(1)					      General Commands Manual						  EDOS-RPMCHECK(1)

NAME

       Edos-rpmcheck - Check satisfiability of rpm package dependencies

SYNOPSIS

       edos-rpmcheck [option] ... [package] ...

DESCRIPTION

       edos-rpmcheck  reads  from  standard  input  a set of rpm package descriptions. Packages may appear with multiple versions in this set. For
       instance, an uncompressed hdlist.cz is suitable as input.

       We say that a package is identified in this set by the pair consisting of the package name and of the package version.

       A package (called goal) is called installable with respect to a set of packages if there exists a subset of the packages that
	- contains at most one version for each package name
	- contains the goal package (in any version, or a specific version)
	- all packages of the subset have their dependencies and conflicts satisfied in this subset.

       Edos-rpmcheck checks whether every package given as argument is installable with respect to the input set of  packages.	Specific  versions
       can be specified by following the package name with the sign '=' and the version of the package (for instance, 'xemacs21=21.4.17-1'). If no
       package name is given as argument then all packages of the input set are checked for satisfiability.

       The constraint solving algorithm is complete, that is it finds a solution whenever there exists one, even for multiple  disjunctive  depen-
       dencies	and  deep  package  conflicts. This problem is computationally infeasible in theory (that is, NP-complete), but can in practice be
       solved very efficiently.

OPTIONS

       -explain
	      Explain the results

       -rules Print generated rules

       -failures
	      Only show failures

       -successes
	      Only show successes

       -base file
	      Specifiy an additional file providing packages that are not checked but used for resolving dependencies

       -quiet Supress warnings and progress/timing messages

       -xml   Output results in XML format

       -help, --help
	      Display this list of options

EXAMPLE

       Check which packages in a particular distribution are not installable and why:

	 gunzip -c hdlist.cz | edos-rpmcheck -failures -explain

       where hdlist.cz is the file pertaining to that distribution.

       Check whether version 21.4.17-1 of the xemacs21 package is installable in a distribution described by the file Packages:

	 gunzip -c hdlist.cz | edos-rpmcheck -explain xemacs=21.4.17-1

AUTHOR

       Edos-rpmcheck has been written by Jerome Vouillon for the EDOS project. This man-page has been compiled by Ralf Treinen.

SEE ALSO

       <http://www.edos-project.org> is the home page of the EDOS project.

       edos-debcheck(1) is the analogous tool for debian packages.

EDOS
								    2006-05-20							  EDOS-RPMCHECK(1)
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