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Full Discussion: deleting text records with sed (sed paragraphs)
Top Forums Shell Programming and Scripting deleting text records with sed (sed paragraphs) Post 302347999 by Festus Hagen on Thursday 27th of August 2009 06:26:52 AM
Old 08-27-2009
deleting text records with sed (sed paragraphs)
Hi all,

First off, Thank you all for the knowledge I have gleaned from this site!

Deleting Records from a text file... sed paragraphs

The following code works nearly perfect, however each time it is run on the log file it adds a newline at the head of the file, run it 5 times, it'll have 5 blank lines at the head of the file.

I have been unable to figure out why or how to prevent it.

Newlines should be after the record, not before.

Also, How big of file can sed handle like this??

The code: (I have made it into a here doc for example)
Code:
#!/bin/sh

matchitem=' Using archive: /mnt/Raid/test/Backup_20090824@051500.tbz'
item2del=$(echo "${matchitem}" | sed 's:[]\[\^\$\.\*\/]:\\&:g')

sed -n '
/Backup started:/ b paragraph
H
$ b paragraph
b
:paragraph
x
/'"${item2del}"'/!p' <<EOF
Backup started: Sat Aug 22 05:15:00 EDT 2009, MyBackup v3.0.8
 Using archive: /mnt/Raid/test/Backup_20090822@051500.tbz
Backup completed: 293,437,440 bytes in 131 seconds at 05:17:11 EDT

Backup started: Sun Aug 23 05:15:00 EDT 2009, MyBackup v3.0.8
 Using archive: /mnt/Raid/test/Backup_20090823@051500.tbz
Backup completed: 224,477,184 bytes in 100 seconds at 05:16:40 EDT

Backup started: Mon Aug 24 05:15:00 EDT 2009, MyBackup v3.1.0
 Using archive: /mnt/Raid/test/Backup_20090824@051500.tbz
 Removed archive: /mnt/Raid/test/Backup_20090817@051501.tbz
Backup completed: 224,307,734 bytes in 99 seconds at 05:16:39 EDT

Backup started: Tue Aug 25 05:15:00 EDT 2009, MyBackup v3.1.0
 Using archive: /mnt/Raid/test/Backup_20090825@051500.tbz
 Removed archive: /mnt/Raid/test/Backup_20090818@051500.tbz
Backup completed: 237,993,204 bytes in 104 seconds at 05:16:44 EDT

EOF

Thanks all

-Enjoy
fh : )_~
 

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LEARN ABOUT REDHAT

nwbpset

NWBPSET(1)							      nwbpset								NWBPSET(1)

NAME

       nwbpset - Create a bindery property or set its value

SYNOPSIS

       nwbpset [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ]

DESCRIPTION

       nwbpset Reads a property specification from the standard input and creates and sets the corresponding property. The format is determined by
       the output of 'nwbpvalues -c'. nwbpset will hopefully become an important part of the bindery management suite of ncpfs, together with

       As another example, look at the following command line:

	 nwbpvalues -t 1 -o supervisor -p user_defaults -c |
	 sed '2s/.*/ME/'|
	 sed '3s/.*/LOGIN_CONTROL/'|
	 nwbpset

       With this command, the property user_defaults of the user object 'supervisor' is copied into the property login_control of the user  object
       'me'.

	 nwbpvalues -t 1 -o me -p login_control -c |
	 sed '9s/.*/ff/'|
	 nwbpset

       This command disables the user object me.

       Feel free to contribute other examples!

       nwbpset looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more information.
       Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons.

OPTIONS

       -h
	  -h is used to print out a short help text.

       -S server
	  server is the name of the server you want to use.

       -U user
	  user is the user name to use for login.

       -P password
	  password is the password to use for login. If neither -n nor -P are given, and the user has no open connection to  the  server,  nwbpset
	  prompts for a password.

       -n
	  -n should be given if no password is required for the login.

       -C
	  By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off
	  this conversion by -C.

AUTHORS

       nwbpset was written by Volker Lendecke. See the Changes file of ncpfs for other contributors.

nwbpset 							     8/7/1996								NWBPSET(1)
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