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Full Discussion: sed and grep
Operating Systems Linux sed and grep Post 302792925 by Don Cragun on Thursday 11th of April 2013 10:51:39 AM
Old 04-11-2013
Quote:
Originally Posted by ravisingh
I am stranded with a problem. Please solve.

How will you remove blank lines from a file using sed and grep? ( blank line contains nothing or only white spaces).

I run the below commands of sed and grep but grep isn't giving output as desired. Why?

Code:
sed '/^[ \o11]*$/d' blank

grep -v "^[ \o11]*$" blank

(there is a space before tab in character class)

The above sed command gave desired result but not grep. Why?

Also, I am fix at one more place. As, tab is 011 (octal) but in my system the zero of 011 is accepting as o (alphabetic) instead of numeral zero. If I give numeral zero, it won't work. Is it O.K.? A few days back by mistake a system file got deleted becz of which link count is not showing properly. Can this be a reason for the above problem.

Waiting eagerly for your valuable replies.

Moderator's Comments:
Mod Comment edit by bakunin: please use CODE-tags
I find it hard to believe that either of these commands did what you want. The \o11 needs to be \011 (i.e., digit zero; not lowercase letter oh).

To make it clearer to readers, you could also replace your bracket expression with [[:space:]].
 

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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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