General :: Redirect All Outputs From /dev/console To /dev/pts/0?
Aug 9, 2010
The serial console is for debugging and will physically disappear when product is mature. However, there are many background processes that may print out statuses/results. These go to /dev/console or serial console. Telnet will be the only way to get a console. I tried netconsole (with netcat) and it works, but it is only for kernel printk messages. I tried "program > /dev/pts/0" and it works also. it would be better if I can just change/add the console /dev/pts/0 to the existing /dev/console.
My hardware is the FriendlyArm mini2440 Samsung board. I run our main application from init.d/rcS. It uses printf's to display continuous program debug information that can be seen on the serial ttySAC2 console. I would like to be able to remotely view this information by a telnet connection when needed. What is the best way to accomplish this? The telnet user can possibly activate some script or program. I saw there is a ttysnoop program that I could not get to compile.
There must be a simpler way. There must be several ways. Instead of using printf I could do something else. I do not want to use a normal log file to the flash file system. I had thought of using a ram file in /var directory but it would complicate matters as I would need to limit its size and the telnet user needs to view the program's printfs in a real time fashion.
I'd like to redirect the output to a file and to the console. I know about tee but the issue is that it waits until the first process finishes.e.gecho "hello world" | tee test.txtfirst calls echo and then tee.Is there a way to redirect "on the fly" ?
How system call internals could be known ? I mean for example if i take the example of write system call of linux kernel, where i can find out the code of write() system call in the kernel source tree ? The problem is write() system call directly write on console.If we want to write the data on some web page then write() system call will not do that ? How to redirect out data from console to application like html/web page?
how to update a series of values from multiple grep commands outputs to be appended to a single row of a csv file? Work on a linux envir. The values from grep output will be numeric values.
Output sold look like:
1,3,4,5,7,0,5
Each of these values will be odtained from multiple grep commands piped with wc -l Is it possible to update a single row of a csv file if so pleas ehelp me with the command to be used to redirect the output into the csv file
I'm on Ubuntu 11.04. I have read around about how to use curl to download a list of URLs from a text file, and everyone says to use Code:curl -K URLlist.txt. This is what the curl man page says as well. However, for even a simple file with one URL, this command outputs a bunch of weird symbols for me instead of downloading the file.For example, I have a text file "test.txt" with one line in the following format:
Code: url = "http://www.example.com/image.jpg" I use the curl command to download this file:
I am trying to grep multiple numbers from file, grep does have the -f option for that.
Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with
Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?
How can I start a program from tty1 console text mode to be executed in tty2 console text mode? Actualy I would like to start a program (chat client cli program) in tty8 automaticaly when linux PC boots.
Since i upgraded to F14 I have been having an annoying problem with compiz: I have twinview and an nvidia 8800GTS. Windows like transmission and pidgin that i put on my second monitor and then hide, have their position reset to the center left side of the screen on the absolute border of the first monitor. this is probably a problem with how compiz is detecting the outputs.
EDIT: Any windows that have their position saved to the second screen will be reset to hug the center left side of the screen.
SOLVED: I manually set the outputs in compiz and the selected use largest output first in Place Windows plugin.
I'm trying to use this thread to set my laptop's resolution to 640x480. To do this, I need to use the addmode command which expects me to list an OUTPUT. What OUTPUT do I list? The "xrandr -q" command doesn't list any outputs.Here is the result of me typing "xrandr -q":
Code: Screen 0: minimum 800 x 600, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm x 0mm
I have been having some fun with the shell but have become a little lost. I want to be able to email (myself and others) outputs from various commands etc. Sometimes people wish to know the contents of my music library etc and it's nice to be able to ssh in and email an ls (or similar) output.
Here is what I have been doing: Code: ls -R /home/simon/mount/sata0/audio > /tmp/musiclist mail -s $(date +%Y%m%d) email@domain.com < /tmp/musiclist The date part works perfectly and I receive an email with a subject suiting my preferential YYYYMMDD format.
But what I'd like to figure out is how to get this into a single line of code, my first attempt was: Code: mail -s $(date +%Y%m%d) email@domain.com < $(ls -R /home/simon/mount/sata0/audio) This generates an error: -bash: $(ls -R /home/simon/mount/sata0/audio): ambiguous redirect But if I simply run the code "ls -R /home/simon/mount/sata0/audio" - the output is exactly what I want.
Is what I'm trying to do even possible? I do realise that I could use something like this Code: ls -R /directory > /tmp/file && mail -s $(date +%Y%m%d) email@domain.com < /tmp/file But this is still running two commands and I'd like to figure out how to be 'cleverer'.
I've been having issues with Devede on my desktop although I used to use it on my laptop back in the day. I click videocd and under advanced options select ISO but can only get the output of a new .mpg. I've also tried to create disc structure but had the same result. I've uninstalled and reinstalled via the software center and still nothing has changed. Currently I'm having to use wine to run ConvertXtoDVD and then burn with K9Copy.
I have sshed into a linux box and I'm using dvtm and bash (although I have also tried this with Gnu screen and bash). I have two terminals, current /dev/pts/29 and /dev/pts/130. I want to redirect the input from one to the other.And then when I type in /dev/pts/29 the characters I type should show up in /dev/pts/130. However what ends up happening is that every other character I type gets redirected.
I have a linux test machine which I would like to run a copy of a production webserver. This is a legacy application which does not use a property file for its server name. Throughout the application, the server name is hardcoded (example: open connection to myServer.myCompany.com).
Is there any linux trick which I can use to redirect all requests for a certain host back to localhost? I know in Windows that I can add an entry to the hosts file and have it redirect back to localhost. How do I do this in linux?
My poblem: At work I have a proxy with some closed ports. I need to connect to an Oracle DB on some DB_IP at port 1521. DB_IP is a public IP. What I Have: At home, I have a Linux machine and a Linksys WRT54G Router. What I need: How can I do to communicate a PC at work with DB_IP:1521?
Although this is a basic stuff, but still i wonder. Consider these two examples. code...
I wonder, why doesn't redirection work in first case? when to use redirect and when to use pipes? I have been Linux for a long time, but still this basic stuff baffles me.
I have a crontab that wgets a PHP page every five minutes (just to run some the PHP code), and I want to send the output to /dev/null. I couldn't find it in the wget manual.
i have installed squid 2.6 on my centos. i have writen a shell script to ping a network and write to a file. write '1' if network up and '0' if network down. After that,a perl script will read the file and do the redirection.Perl will redirect to a fix URL [URL] if the network down and do nothing when it up. i have put my perl script in squid.conf at url_rewrite_program /my_file_path.
below is my shell script for pinging:
Quote:
#!/bin/bash while [ 1 ] do HOST=143.148.137.134
[code]....
My problem is client browser are not redirect to www.google.com even the network is down. It should go to the fix URL when the user click any URL in network down situation.it just appear cannot resolve host.
We installed the apache server on oraapps.yan.com. we are planning to use as a proxy server.we have 4 servers inlcuding oraapps.yan.com. Each of them has 3 or more applications. I would like to redirect them to oraapps.yan.com. is it possible. if its how to do that.
