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Full Discussion: Help with grep script
Homework and Emergencies Homework & Coursework Questions Help with grep script Post 302798581 by hanson44 on Wednesday 24th of April 2013 06:25:33 PM
Old 04-24-2013
Yes, I would say grep '^\(..\)*.$' file the best solution.

Code:
$ cat file
1

12
123
12345
123456

Code:
$ grep '^\(..\)*.$' file
1
123
12345

 

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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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