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Full Discussion: is grep -i broken?
Operating Systems Linux is grep -i broken? Post 302079962 by tphyahoo on Friday 14th of July 2006 06:51:33 AM
Old 07-14-2006
is grep -i broken?
Is grep -i (case insensitive) broken? If not, can someone explain to me why the third grep fails with no output?
Code:
$ echo DBI DBH | grep DB[IH]
DBI DBH

$ echo dbi dbh | grep -i 'DB[IH]'
dbi dbh

$ echo DBI DBH | grep -i DB[IH]

$ grep --version
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
Dies ist freie Software; in den Quellen befinden sich die Lizenzbedingungen.
Es gibt KEINERLEI Garantie; nicht einmal für die TAUGLICHKEIT oder
VERWENDBARKEIT FÃR EINEN BESTIMMTEN ZWECK.

Last edited by tphyahoo; 07-14-2006 at 08:08 AM..
 

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LEARN ABOUT PLAN9

zgrep

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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