Looking into file ! Post: 302138888

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Top Forums Shell Programming and Scripting Looking into file ! Post 302138888 by drl on Wednesday 3rd of October 2007 05:12:43 PM

10-03-2007

Registered User

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

drl

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)

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LEARN ABOUT OPENSOLARIS

script