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Full Discussion: Another sed question
Top Forums Shell Programming and Scripting Another sed question Post 75138 by STiVo on Wednesday 15th of June 2005 02:18:11 PM
Old 06-15-2005
Another sed question

I'm trying to process some files using sed but I'm running into a problem. Let me first show an example- this isn't the actual data I use but it will simplify the problem..

For my example, this is the contents of input.txt.
Code:
Name: Bob Smith
Address: 123 Main Street
City: Anytown, USA 010101

Item: Coffee Mug
Item: Baseball Hat
Item: Keychain

Here is the sed command I run to parse the information I need to capture.
Code:
cat input.txt | sed -e 's:Name\: \(.*\).*:\1:p' -e 's:Address\: \(.*\).*:\1:p' -e 's:City\: \(.*\), \(.*\) \(.*\).*:\1, \2 \3:p' -n -e 's:Item\: \(.*\).*:\1:p'

And finally, here is the output...
Code:
Bob Smith
123 Main Street
Anytown, USA 010101
Coffee Mug
Baseball Hat
Keychain

The sed command prints all of the 'Items'. What I want is a way to print only the first occurrence of the Item field.

So the output would look like this...
Code:
Bob Smith
123 Main Street
Anytown, USA 010101
Coffee Mug

I've simplified the data and the output for my question. I would really like to do it all in a shell script with no sed command files. I don't want to use tail or head either.

Any ideas? I've looked and looked but can't really find the answer. Thanks in advance for any help you may provide! Smilie
 

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SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME
shtool-subst - GNU shtool sed(1) substitution operations SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext] [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...] DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files. OPTIONS
The following command line options are available. -v, --verbose Display some processing information. -t, --trace Enable the output of the essential shell commands which are executed. -n, --nop No operation mode. Actual execution of the essential shell commands which would be executed is suppressed. -w, --warning Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution operations resulted in no content change on all files. -q, --quiet Suppress warning on substitution operation resulting in no content change. -s, --stealth Stealth operation. Preserve timestamp on file. -i, --interactive Enter interactive mode where the user has to approve each operation. -b, --backup ext Preserve backup of original file using file name extension ext. Default is to overwrite the original file. -e, --exec cmd Specify sed(1) command directly. -f, --file cmd-file Read sed(1) command from file. EXAMPLE
# shell script shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch] # RPM spec-file %install shtool subst -v -n -e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' -e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' `find . -name Makefile -print` make install HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications. SEE ALSO
shtool(1), sed(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)
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