pipe grep command Post: 302316312

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Top Forums Shell Programming and Scripting pipe grep command Post 302316312 by cfajohnson on Thursday 14th of May 2009 06:17:25 PM

05-14-2009

Registered User

Quote:

Originally Posted by epro66

Hi all,
Can someone help me with the following problem.
I am executing the following command:
(search for occurences of 'error' in files that match cl-*.log expression)
> grep -cw -i --max-count=1 'error' cl-*.log
this command outputs:
cl-apache.log:1
cl-apache_error.log:1
cl-apache_warn.log:1
cl-apache_2009_05_13.log:1

Than I want to filter the results from this command and exclude lines
that are matching some user entered wildcard (lets say: exclude files
from the result that match 'cf-*err*'). So I tried the following command:
> grep -cw -i --max-count=1 'error' cl-*.log | grep -v 'cf-*err*'

I was expecting that the second command (grep -v 'cf-*err*') will
filter the first command OUTPUT,

That is what it does. Since the search pattern doesn't exist in the output of the first command, the output will be the same as that of the first command. If it's not, you are not posting the command that you actually ran.

Quote:

but instead, it saerch 'cf-*err*'
WITHIN each file Content, instead of fcommand output.

It could not do that; you didn't put any filenames on the command line, only a search pattern. Therefore, it can only search its standard input.

cfajohnson

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LEARN ABOUT OSX

rcs2log

RCS2LOG(1)						    BSD General Commands Manual 						RCS2LOG(1)

NAME

     rcs2log -- RCS to ChangeLog generator

SYNOPSIS

     rcs2log [-c changelog] [-h hostname] [-i indent] [-l length] [-R] [-r option] [-t tabwidth] [-u login<TAB>fullname<TAB>mailaddr] [-v]
	     [--help] [--version] [file ...]

DESCRIPTION

     The rcs2log utility generates a change log prefix from RCS files (perhaps in the CVS repository) and the ChangeLog (if any).

     The options are as follows:

     -c changelog
	     Output a change log prefix to changelog (default ChangeLog).

     -h hostname
	     Use hostname in change log entries (default current host).

     -i indent
	     Indent change log lines by indent spaces (default 8).

     -l length
	     Try to limit log lines to length characters (default 79).

     -R      If no file(s) are given and RCS is used, recurse through working directory.

     -r option
	     Pass option to subsidiary log command.

     -t tabwidth
	     Tab stops are every tabwidth characters (default 8).

     -u login<TAB>fullname<TAB>mailaddr
	     Assume login has fullname and mailaddr.

     -v      Append RCS revision to file names in log lines.

     --help  Output help.

     --version
	     Output version number.

SEE ALSO

     rcs(1), rcsintro(1), rlog(1), rcsfile(5)

AUTHORS

     Paul Eggert <eggert@twinsun.com>

BUGS

     Report bugs to <bug-gnu-emacs@gnu.org>.

BSD
								 February 15, 2003							       BSD