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Full Discussion: extracting lines from a file
Top Forums Shell Programming and Scripting extracting lines from a file Post 89705 by pradeepthanraj on Tuesday 15th of November 2005 08:33:28 AM
Old 11-15-2005
extracting lines from a file

Hi all,

I need to extract some lines from a file based on a condition. For ex:
My file will contain 50 lines and i need to extract line which has "File" in it and then the line which has "date" in it. Which command will be the most efficient way to do it. I have tried two ways
1. reading the file line by line and seperating the line if the line has the filed "File"
2. grep the file for the field "File" .
Since i need to open around 1000 files and perform the operation , can anyone provide me the most optimal way to do it .
 

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UNRAR-FREE(1)						      General Commands Manual						     UNRAR-FREE(1)

NAME
unrar-free -- extract files from rar archives SYNOPSIS
unrar-free [-xtfp?V] [--extract] [--list] [--force] [--extract-newer] [--extract-no-paths] [--password] [--help] [--usage] [--ver- sion] ARCHIVE [FILE ...] [DESTINATION] DESCRIPTION
unrar-free is a program for extracting files from rar archives. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. -x --extract Extract files from archive (default). -t --list List files in archive. -f --force Overwrite files when extracting. --extract-newer Only extract newer files from the archive. --extract-no-paths Don't create directories while extracting. -p --password Decrypt archive using a password. -? --help Show program help. --usage Show short program usage message. -V --version Show version of program. NON-FREE UNRAR COMPATIBLE SYNOPSIS unrar-free [elvx] [-ep] [-o+] [-o-] [-ppassword] [-u] [--] ARCHIVE [FILE ...] [DESTINATION] This syntax should only be used in front-end programs which are using non-free unrar as a back-end. It is recommended to use this program by GNU command line syntax. e Extract files from archive without full path. l List files in archive. v Verbose list files in archive. x Extract files from archive with full path. -ep Don't create directories while extracting. -o+ Overwrite files when extracting. -o- Don't overwrite files when extracting. -p Decrypt archive using a password. -u Only extract newer files from the archive. -- Disable further switch processing. Any switch after the -- are treated as filenames and destination. BUGS
Advanced features of version 3.0 archives are not currently supported. AUTHORS
unrar-free was written by Ben Asselstine based on UniquE RAR File Library by Christian Scheurer and Johannes Winkelmann. This manual page was written by Niklas Vainio <niklas.vainio@iki.fi> for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version pub- lished by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. UNRAR-FREE(1)
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