11-26-2007
grep within certain part of file
Hi,
Is it possible to grep only on a certain part of a file? Say I have file in.txt which contains below:
11/16 13:07:19.5436 --- ERROR 123 detected.
11/16 13:08:19.5436 --- Generating a <reading> event
11/16 13:08:19.7784 ---- Sending a <writing> event
11/16 14:08:37.4516 --- Generating a <reading> event
11/16 14:08:37.9199 ---- Sending a <writing> event
11/16 14:09:19.5436 --- ERROR 123 detected.
11/16 14:09:49.8452 --- Generating a <reading> event
11/16 14:09:50.0868 ---- Sending a <writing> event
11/16 16:10:51.6707 --- Generating a <reading> event
11/16 16:10:52.3232 ---- Sending a <writing> event
11/16 16:08:19.5436 --- Generating a <reading> event
11/16 16:08:19.7784 ---- Sending a <writing> event
11/16 16:08:19.9436 --- ERROR 123 detected.
11/16 16:08:37.4516 --- Generating a <reading> event
11/16 16:08:37.9199 ---- Sending a <writing> event
11/16 16:09:49.8452 --- Generating a <reading> event
11/16 16:09:50.0868 ---- Sending a <writing> event
11/16 16:10:51.6707 --- Generating a <reading> event
11/16 16:10:52.3232 ---- Sending a <writing> event
Now, I only want to get a certain part on the file.. say the part
11/16 14:09:49.8452 --- Generating a <reading> event
11/16 14:09:50.0868 ---- Sending a <writing> event
11/16 16:10:51.6707 --- Generating a <reading> event
11/16 16:10:52.3232 ---- Sending a <writing> event
11/16 16:08:19.5436 --- Generating a <reading> event
11/16 16:08:19.7784 ---- Sending a <writing> event
which is after the 2nd "ERROR 123 detected." line. Then put it in a file.
Also, is it possible to cut this file into chunk. The delimiter would be the "ERROR 123 detected."
Each chunk of file will be put into a new file. Im just new to unix and still learning and I have many ideas in mind that I could not execute due to insufficient knowledge in the language. Thanks.
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)