It's the same: "Each command in a pipeline is executed as a separate process (i.e., in a subshell)". So you have a subshell even with { } | ....
However:
Code:
$ ( exec 3>&1; ls file none 2>&1 1>&3 | tee -a /dev/tty; ) |cat >logfile; cat logfile
ls: impossibile accedere a none: File o directory non esistente
ls: impossibile accedere a nonefile
: File o directory non esistente
In bash, I need to send the STDOUT and STDERR from a command to one file, and then just STDERR to another file. Doing one or the other using redirects is easy, but trying to do both at once is a bit tricky. Anyone have any ideas? (9 Replies)
Friends
I have to redirect STDERR messages both to screen and also capture the same in a file.
2 > &1 | tee file works but it also displays the non error messages to file, while i only need error messages.
Can anyone help?? (10 Replies)
Hi friends
I am facing one problem while redirecting the out of the stderr and stdout to a file
let example my problem with a simple example
I have a file (say test.sh)in which i run 2 command in the background
ps -ef &
ls &
and now i am run this file and redirect the output to a file... (8 Replies)
working on a c sell script
I think I understand the concept of it, which is:
filename >> file.txt (to appaend)
or filename | tee -a file.txt (to append)
The problem is that my shell script is used with several parameters, and these commands don't seem to work with just filename. They... (2 Replies)
Hi
I am not if this is possible: is it possible in bach (or another shell) to redirect GLOBALLY the stdout/stderr channels to a file.
So, if I have a script
script.sh
cmd1
cmd2
cmd3
I want all stdout/stderr goes to a file. I know I can do:
./script.sh 1>file 2>&1
OR
... (2 Replies)
Hi,
I already searched through the forum and tried to find a answer for my problem but I didn't found a full working solution, thats way I start this new thread and hope, some can help out.
I wonder that I'm not able to find a working solution for the following scenario:
Working in bash I... (8 Replies)
I originally wrote my script using the korn shell and had to port it to bash on a another server. My script is working find for backing up but noticed that now after the move, I am not getting any output to my log files.
Using Korn shell, this worked for me for some odd reason. This was sending... (2 Replies)
Dear all,
redirecting STDOUT & STDERR to file is quite simple, I'm currently using:
exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.logBut during script execution I would like the output come back again to screen, how to do that?
Thanks
Lucas (4 Replies)
Hi folks
I need/want to redirect output (stdout, stderr) from an exec call to separate files. One for stderr only and two(!) different (!) ones for the combined output of stderr and stdout.
After some research and testing i got this so far :
(( exec ${command} ${command_parameters} 3>&1... (6 Replies)
Dear all,
redirecting STDOUT & STDERR to file is quite simple, I'm currently using:
Code:
exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.log
But during script execution I would like the output come back again to screen, how to do that?
Thanks
Luc
edit by bakunin: please use CODE-tags like the... (6 Replies)
Discussion started by: tmonk1
6 Replies
LEARN ABOUT LINUX
bootlogd
BOOTLOGD(8) Linux System Administrator's Manual BOOTLOGD(8)NAME
bootlogd - record boot messages
SYNOPSIS
/sbin/bootlogd [-c] [-d] [-r] [-s] [-v] [ -l logfile ] [ -p pidfile ]
DESCRIPTION
Bootlogd runs in the background and copies all strings sent to the /dev/console device to a logfile. If the logfile is not accessible, the
messages will be kept in memory until it is.
OPTIONS -d Do not fork and run in the background.
-c Attempt to write to the logfile even if it does not yet exist. Without this option, bootlogd will wait for the logfile to appear
before attempting to write to it. This behavior prevents bootlogd from creating logfiles under mount points.
-r If there is an existing logfile called logfile rename it to logfile~ unless logfile~ already exists.
-s Ensure that the data is written to the file after each line by calling fdatasync(3). This will slow down a fsck(8) process running
in parallel.
-v Show version.
-l logfile
Log to this logfile. The default is /var/log/boot.
-p pidfile
Put process-id in this file. The default is no pidfile.
BUGS
Bootlogd works by redirecting the console output from the console device. (Consequently bootlogd requires PTY support in the kernel con-
figuration.) It copies that output to the real console device and to a log file. There is no standard way of ascertaining the real con-
sole device if you have a new-style /dev/console device (major 5, minor 1) so bootlogd parses the kernel command line looking for con-
sole=... lines and deduces the real console device from that. If that syntax is ever changed by the kernel, or a console type is used that
bootlogd does not know about then bootlogd will not work.
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
SEE ALSO dmesg(8),fdatasync(3).
Jul 21, 2003 BOOTLOGD(8)
09-07-2012
