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Top Forums Shell Programming and Scripting SED to delete last word on line...what's wrong? Post 302444048 by agama on Tuesday 10th of August 2010 08:56:34 PM
Old 08-10-2010
I've used your sed command with two different versions of sed (gnu and AT&T AST's) and both work just fine.

Before looking at your try, I wrote one and did things just a bit differently:

Code:
# newlines only make it more readable
sed   's/[ \t]*$//; 
s/[ \t][^ \t]+$//; 
s/[ \t]*$//;'

The first subs command ditches trailing whitespace upto the end of line. The second, ditches the last word, and a preceding whitespace character. The third ditches any trailing whitespace that might have been left. The biggest difference is that it catches both tabs and spaces. If "data" and "lastdata" are separated by a tab, and not a space, your substitutions will see <space>data<tab>lastdata as the last 'word.'

Don't know if this is what is actually going on, but it's the only way I could explain it.
 

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databases(5)						     GNATS configuration files						      databases(5)

NAME
databases - the known set of GNATS databases DESCRIPTION
The databases configuration file is a site-wide configuration file containing the list of GNATS databases that are available either on the host itself or remotely over the network, together with some parameters associated with each database. It is located in the directory /usr/share/gnats. The file contains one line for each database. For databases located on the host itself, each line consists of three fields separated by colons: database name:short description:/path/to/database The first field is the database name. This is the name used to identify the database when invoking programs such as query-pr or send-pr, either by using the --database option of the program or by setting the GNATSDB environment variable to the name of the database. The sec- ond field is a short human-readable description of the database contents, and the final field is the directory where the database contents are kept. For a database that is located across a network, but which should be accessible from this host, the entry for the database should look like this: database name:short description of database::hostname:port The first two fields are the same as for local databases, the third field is empty (notice the two adjacent `:' symbols, indicating an empty field), the fourth field is the hostname of the remote GNATS server, and the fifth field is the port number that the remote GNATS server is running on. Note that if you add a new local database, you must create its data directory, including appropriate subdirectories and administrative files after adding an entry to databases. This is best done using the mkdb tool. Lines beginning with a # are ignored. The database name default is special; this is the entry used if no database name is specified via a --database option or the GNATSDB envi- ronment variable. SEE ALSO
Keeping Track: Managing Messages With GNATS (also installed as the GNU Info file gnats.info) databases(5), dbconfig(5), delete-pr(8), edit-pr(1) file-pr(8), gen-index(8), gnats(7), gnatsd(8), mkcat(8), mkdb(8), pr-edit(8), query- pr(1), queue-pr(8), send-pr(1). COPYING
Copyright (c) 1993, 2000, 2003, Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be included in translations approved by the Free Software Foundation instead of in the original English. GNATS
August 2003 databases(5)
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