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Full Discussion: Looking into file !
Top Forums Shell Programming and Scripting Looking into file ! Post 302138888 by drl on Wednesday 3rd of October 2007 05:12:43 PM
Old 10-03-2007
Hi.

This script creates another script. The new script uses sed, so it is quite fast, and the entire process is data-driven by the lookup file:
Code:
#!/usr/bin/env sh

# @(#) s1       Demonstrate creation of sed script with awk.

set -o nounset
echo

## Use local command version for the commands in this demonstration.

echo "(Versions used in this script displayed with local utility "version")"
version bash awk sed

echo

echo " Input file of lookup tokens:"
cat -tv data1

./a1 data1 > script
chmod +x script

echo
echo " This is the created sed script:"
cat -n script

echo
echo " Results of running script:"
./script data2

exit 0

You notice that there is an "a1" script. It's in awk, because awk facilitates handling text fields. However, the quoting is a bit complicated:
Code:
#!/usr/bin/awk -f

# @(#) a1       Demonstrate creation of sed script from lookup file.

echo

BEGIN { print "sed \\" }
        { print "-e 's/" $1 " /" $1$2 " /' \\" }
END     { print " data2" }

When s1 runs, it then produces:
Code:
% ./s1

(Versions used in this script displayed with local utility version)
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
GNU Awk 3.1.4
GNU sed version 4.1.2

 Input file of lookup tokens:
6589 7879
8787 0909
4343 4576

 This is the created sed script:
     1  sed \
     2  -e 's/6589 /65897879 /' \
     3  -e 's/8787 /87870909 /' \
     4  -e 's/4343 /43434576 /' \
     5   data2

 Results of running script:
6767879898009965897879 65656576687878
7887576576757687870909 88787878756446
3232476568769843434576 42341242542345

Best wishes ... cheers, drl
 

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LEARN ABOUT LINUX

shtoolize

SHTOOLIZE.TMP(1)					      GNU Portable Shell Tool						  SHTOOLIZE.TMP(1)

NAME

       shtoolize - Build individual GNU shtool scripts

VERSION

       GNU shtool 2.0.8 (18-Jul-2008)

SYNOPSIS

       shtoolize [-h] [-v] [-q] [-o script] module [ module ... ]

DESCRIPTION

       The shtoolize program builds individual GNU shtool scripts (written to the default output file "shtool" or to the specified script) out of
       one or more shtool ingredient modules.  Available modules are:

	echo	   Print string with optional construct expansion
	mdate	   Pretty-print modification time of a file or dir
	table	   Pretty print a field-separated list as a table
	prop	   Display progress with a running propeller
	move	   Move files with simultan substitution
	install    Install a program, script or datafile
	mkdir	   Make one or more directories
	mkln	   Make link with calculation of relative paths
	mkshadow   Make a shadow tree
	fixperm    Fix file permissions inside a source tree
	rotate	   Rotate a logfile
	tarball    Roll distribution tarballs
	subst	   Apply sed(1) substitution operations
	platform   Platform identification utility
	arx	   Extended archive command
	slo	   Separate linker options by library class
	scpp	   Sharing C Pre-Processor
	version    Generate and maintain a version information file
	path	   Deal with program paths

       Additionally there is a pseudo-module ``"all"'' which can be used as a short-hand for ``"echo mdate table prop move install mkdir mkln
       mkshadow fixperm platform arx slo scpp version path"'', i.e. to build a shtool script with all modules in the standard order. An installed
       shtool is usually built this way via ``"shtoolize -o shtool all"''.

       Use the shtoolize program to build individual shtool scripts in case you want a smaller sized script and you don't need all of the
       available shtool functionality.	For instance for the classical Autoconf based free software package a "shtool" script build via
       ``"shtoolize -o shtool install mkdir"'' might be sufficient.

OPTIONS

       The following command line options exist:

       -h  Displays a short help page describing the usage of shtoolize.

       -v  Displays the version number of shtoolize/shtool.

       -q  Displays no processing information.

       -o script
	   Writes the output to file script instead to file ``"shtool"''.

EXAMPLE

       The typical free software package which is based on GNU libtool and GNU shtool one uses a "Makefile" entry like the following:

	#   Makefile entry for upgrading GNU tools
	upgrade-tools:
	    libtoolize -f -c
	    shtoolize -q all

       This upgrades the three files "ltmain.sh", "ltconfig" and "shtool" in the current source tree to the latest versions.

SEE ALSO

       shtool(1).

AUTHOR

	Ralf S. Engelschall
	rse@engelschall.com
	www.engelschall.com

18-Jul-2008							   shtool 2.0.8 						  SHTOOLIZE.TMP(1)
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