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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TALK(1) General Commands Manual TALK(1)
NAME
talk - talk to another user
SYNOPSIS
talk person [ ttyname ]
DESCRIPTION
Talk is a visual communication program which copies lines from your terminal to that of another user.
If you wish to talk to someone on you own machine, then person is just the person's login name. If you wish to talk to a user on another
host, then person is of the form :
host!user or
host.user or
host:user or
user@host
though host@user is perhaps preferred.
If you want to talk to a user who is logged in more than once, the ttyname argument may be used to indicate the appropriate terminal name.
When first called, it sends the message
Message from TalkDaemon@his_machine...
talk: connection requested by your_name@your_machine.
talk: respond with: talk your_name@your_machine
to the user you wish to talk to. At this point, the recipient of the message should reply by typing
talk your_name@your_machine
It doesn't matter from which machine the recipient replies, as long as his login-name is the same. Once communication is established, the
two parties may type simultaneously, with their output appearing in separate windows. Typing control L will cause the screen to be
reprinted, while your erase, kill, and word kill characters will work in talk as normal. To exit, just type your interrupt character; talk
then moves the cursor to the bottom of the screen and restores the terminal.
Permission to talk may be denied or granted by use of the mesg command. At the outset talking is allowed. Certain commands, in particular
nroff and pr(1) disallow messages in order to prevent messy output.
FILES
/etc/hosts to find the recipient's machine
/var/run/utmp to find the recipient's tty
SEE ALSO
mesg(1), who(1), mail(1), write(1)
BUGS
The version of talk(1) released with 4.3BSD uses a protocol that is incompatible with the protocol used in the version released with
4.2BSD.
4.2 Berkeley Distribution November 27, 1996 TALK(1)