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Full Discussion: Difference between code page used with grep and vi
Top Forums UNIX for Dummies Questions & Answers Difference between code page used with grep and vi Post 302879746 by bakunin on Saturday 14th of December 2013 06:29:22 PM
Old 12-14-2013
There are several possible reasons for this:

First, how did you issue the grep command? If it was "grep -i", then you switched on case INsensitivity, which is not so easily done in vi (certainly not with a command switch). Make sure you really search for the same string in both cases.

Second, The file might contain some (terminal-) control codes, which are "interpreted away" when you pipe it through cat.

Have a look at the unaltered file with "od -ax" to get even the non-displayable characters.

I hopoe this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT ULTRIX

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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