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Top Forums Shell Programming and Scripting How to remove lines containing strings Post 302536026 by Aia on Monday 4th of July 2011 01:57:00 AM
Old 07-04-2011
Quote:
Originally Posted by jayan_jay
Code:
% grep -v "," input_file

It will leave empty lines behind.

However the humble grep is a strong contender.

Code:
grep '[[:digit:]]' input_file

or little more specific
Code:
grep -E '^[[:digit:]]+$' input_file

 

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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)
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