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Strange output from grep
Post 57656 by Bab00shka on Thursday 4th of November 2004 09:48:57 AM
11-04-2004
Strange output from grep
Hi,
I am getting different output for grep depending which directory I am in.
The following is a transcript of my session, I am using egrep but have also used grep -E. The directory names have been changed for security:
$pwd
/dir1/dir2/dir3/dir4
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
$echo $?
1
$cd ..
$pwd
/dir1/dir2/dir3
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
000000
$echo $?
0
$cd ..
$pwd
/dir1/dir2
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
$echo $?
1
$
It appears the output from egrep when run in directory /dir1/dir2/dir3 is the opposite of what I would expect
/dir1/dir2/dir3 and /dir1/dir2/dir3/dir4 are on the same volume.
I have checked and there is only one instance of egrep on the whole server.
The permissions of the directories are as follows
drwxr-xr-x /dir1/dir2
drwxrwxrwx /dir1/dir2/dir3
drwxr-xr-x /dir1/dir2/dir3/dir4
We can't work out why this is happening. Can anyone help?
Many thanks
Helen
I am getting different output for grep depending which directory I am in.
The following is a transcript of my session, I am using egrep but have also used grep -E. The directory names have been changed for security:
$pwd
/dir1/dir2/dir3/dir4
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
$echo $?
1
$cd ..
$pwd
/dir1/dir2/dir3
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
000000
$echo $?
0
$cd ..
$pwd
/dir1/dir2
$echo 000000 |egrep -v [0-1][0-9][0-5][0-9][0-5][0-9]
$echo $?
1
$
It appears the output from egrep when run in directory /dir1/dir2/dir3 is the opposite of what I would expect
/dir1/dir2/dir3 and /dir1/dir2/dir3/dir4 are on the same volume.
I have checked and there is only one instance of egrep on the whole server.
The permissions of the directories are as follows
drwxr-xr-x /dir1/dir2
drwxrwxrwx /dir1/dir2/dir3
drwxr-xr-x /dir1/dir2/dir3/dir4
We can't work out why this is happening. Can anyone help?
Many thanks
Helen
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LEARN ABOUT CENTOS
dirname
DIRNAME(1) User Commands DIRNAME(1) NAME
dirname - strip last component from file name SYNOPSIS
dirname [OPTION] NAME... DESCRIPTION
Output each NAME with its last non-slash component and trailing slashes removed; if NAME contains no /'s, output '.' (meaning the current directory). -z, --zero separate output with NUL rather than newline --help display this help and exit --version output version information and exit EXAMPLES
dirname /usr/bin/ -> "/usr" dirname dir1/str dir2/str -> "dir1" followed by "dir2" dirname stdio.h -> "." GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report dirname translation bugs to <http://translationpro- ject.org/team/> AUTHOR
Written by David MacKenzie and Jim Meyering. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
basename(1), readlink(1) The full documentation for dirname is maintained as a Texinfo manual. If the info and dirname programs are properly installed at your site, the command info coreutils 'dirname invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 DIRNAME(1)