02-28-2009
Exclude Certain Entries from Piped or Redirected Output?
I want to execute a command something like:
find / -name "jni.h"
and I want to direct the output of that command to some type of
filter that will leave out all the lines reporting inaccessible
directories (permission unavailable). Is this a pipe or a redirect?
For example, output like the below is not useful to me:
$ find / -name "jni.h"
find: /.fseventsd: Permission denied
find: /.Spotlight-V100: Permission denied
find: /.Trashes: Permission denied
^C
I have been looking over awk, sed, grep and the like to no avail.
I know this is possible. I did it years ago when I worked in
a command line development environment but I'm having trouble
finding it again.
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ZLESS(1) General Commands Manual ZLESS(1)
NAME
zless - file perusal filter for crt viewing of compressed text
SYNOPSIS
zless [ name ... ]
DESCRIPTION
Zless is a filter which allows examination of compressed or plain text files one screenful at a time on a soft-copy terminal. It is the
equivalent of setting the environment variable LESSOPEN to '|gzip -cdfq -- %s', and the environment variable LESSMETACHARS to
'<space><tab><newline>;*?"()<>[|&^`#$%=~', and then running less. However, enough people seem to think that having the command zless
available is important to be worth providing it.
SEE ALSO
zmore(1), less(1)
BUGS
Zless does not work with compressed data that is piped to it via standard input; it requires that input files be specified as arguments.
To read compressed data from a pipe, you can use ...|gunzip|less instead of ...|zless.
COPYRIGHT NOTICE
Copyright (C) 2006, 2007 Free Software Foundation, Inc.
Copyright (C) 1992, 1993 Jean-loup Gailly
Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a permission notice identical to this one.
Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified
versions, except that this permission notice may be stated in a translation approved by the Foundation.
ZLESS(1)