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Top Forums Shell Programming and Scripting sed returns different results while substitution on a pipe delimited file Post 302542654 by alister on Thursday 28th of July 2011 09:42:29 AM
Old 07-28-2011
Quote:
Originally Posted by Shell_Life
You can do it in "sed" using a data mark:

Code:
sed -e 's/|/MyMark/99' -e 's/\(.*|\).*MyMark/\1||/' Input_File

The above will remove the value in the field 99.
The only "data mark" needed is already provided, the field delimiter, "|":
Code:
sed 's/[^|]*|/|/99'

---------- Post updated at 09:42 AM ---------- Previous update was at 09:31 AM ----------

Quote:
Originally Posted by vmenon
My requirement is to replace n positions of a pipe delimited file with a value i specify.
To replace the value of the nth field in a pipe-delimited line, where n=99:
Code:
sed 's/[^|]*|/NEWVALUE|/99'

That will not work for the final field since it is not followed by a pipe. If that case needs to be handled, use a '$' anchor instead of a '|' at the end of the regular expression.

Regards,
Alister
 

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Regexp::Common::delimited(3)				User Contributed Perl Documentation			      Regexp::Common::delimited(3)

NAME
Regexp::Common::delimited -- provides a regex for delimited strings SYNOPSIS
use Regexp::Common qw /delimited/; while (<>) { /$RE{delimited}{-delim=>'"'}/ and print 'a " delimited string'; /$RE{delimited}{-delim=>'/'}/ and print 'a / delimited string'; } DESCRIPTION
Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via Regexp::Common. $RE{delimited}{-delim}{-esc} Returns a pattern that matches a single-character-delimited substring, with optional internal escaping of the delimiter. When "-delim=S" is specified, each character in the sequence S is a possible delimiter. There is no default delimiter, so this flag must always be specified. If "-esc=S" is specified, each character in the sequence S is the delimiter for the corresponding character in the "-delim=S" list. The default escape is backslash. For example: $RE{delimited}{-delim=>'"'} # match "a " delimited string" $RE{delimited}{-delim=>'"'}{-esc=>'"'} # match "a "" delimited string" $RE{delimited}{-delim=>'/'} # match /a / delimited string/ $RE{delimited}{-delim=>q{'"}} # match "string" or 'string' Under "-keep" (See Regexp::Common): $1 captures the entire match $2 captures the opening delimiter (provided only one delimiter was specified) $3 captures delimited portion of the string (provided only one delimiter was specified) $4 captures the closing delimiter (provided only one delimiter was specified) $RE{quoted}{-esc} A synonym for $RE{delimited}{q{-delim='"`}{...}} SEE ALSO
Regexp::Common for a general description of how to use this interface. AUTHOR
Damian Conway (damian@conway.org) MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be). BUGS AND IRRITATIONS
Bound to be plenty. For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be. LICENSE and COPYRIGHT This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail. This module is free software, and maybe used under any of the following licenses: 1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD Licence. See the file COPYRIGHT.BSD. 4) The MIT Licence. See the file COPYRIGHT.MIT. perl v5.18.2 2013-03-08 Regexp::Common::delimited(3)
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