General :: Script To Output Both The Stderr And Stdout To The Same Text File?

Aug 5, 2011

Am having issues getting the output from a script to be logged in a file. I need the script to output both the stderr and stdout to the same text file.

At present I have the following script:

echo TR3_1 > printers.txt
snmpget -v 1 -c public 10.168.**.* SNMPv2-SMI::mib- &>> printers.txt


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Software :: Bash Output Stderr To 2 Files And Stdout?

Apr 5, 2011

I want to output the stdout and stderr in a logfile,moreover i do want to log stderr also to a separate logfile, and print str to the screen I searched arround and tried:


$ command 2>&1 > log | tee -a log log.err

But then in log first the stdout appears, and then stderr.

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Programming :: Libxml2: Removing Output On Stdout/stderr - Element CA Does Not Carry Attribute Maxlength

Jul 26, 2010

I'm using libxml2 to handle/manipulate some XML files. In order to check the consistency of a XML file, I have a DTD and I'm using the xmlValidateDtd method to compute the check.

However, when an error occures during the check (for example an attribute is missing in a XML tag), then libxml2 writes the error on the stdout/stderr. For exemple:


/home/XML/FreeFour.xml:18: element CA: validity error : Element CA does not carry attribute maxlength

The method return the right result (true or false depending on the check result), but occurring errors are written on the stdout/stderr, and I actually don't want that.

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Programming :: Cannot Redirect All Stdout And Stderr Into File

May 12, 2009

I have a little complex Makefile system. A parent Makefile call dozens of Makefiles in subdirctories. And the subdirctory Makefile calles shell script to do real building. I want to grab all output this Makefile system generate. So, i employ "make 2>&1 > make.log". but not all output messages are filed into make.log. The message generated by sub-makefile called shell script cannot be recorded into make.log. And another curiouse thing is, if i launch "make 2>&1 > make.log" in a perl script, all output do be sent into make.log.

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Programming :: Redirecting Stdout To File And Terminal And Stderr To File?

Apr 20, 2010

I have a script where I want to redirect stdout to the terminal and also to a log file aswell as redirecting stderr to the same log file but not the terminal.I have the following code which I found on the net which redirects both stderr and stdout to a file and the logfile,

Code: if [ -p $PIPE1 ]
rm $PIPE1


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General :: Redirect Stdout/stderr Of Multiple Commands In One Shot?

Jun 3, 2011

I have several commands in a bash script, and in the middle of the script there are several commands whose output and error streams I want to redirect to a file. I think I could simply add '>> myfile.txt' to the end of every command, but is there a way to set it before that block of commands, then reset the streams to their original state at the end of that block?

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Software :: Get Stderr And Stdout Of A Program Into Separate Env Variables?

May 19, 2010


MY_STDERR=`my-command >&2`

That is, i want to have to run my-command only once and get the same result. I've tried this:


YYY=$(XXX=`{ echo -n 111; echo 222 >&2; }` 2>&1); echo $XXX $YYY

where "{ echo -n 111; echo 222 >&2; }" is my-command. But it gives this output:



instead of "111 222". What's wrong in my script?

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Programming :: Redirecting Stdin / Stdout And Stderr For Program Run As Fork()/execl()?

Nov 24, 2010

I'm trying to write a program that will fork a series of FTP sessions. For each session, there should be separate input and output files associated with stdin and stdout/stderr.
I keep reading how I should be able to do that with dup2() in the child process before the execl(), but it's not working for me. Could someone please explain what I've done wrong? The program also has a 30-second sniper alarm for testing and killing of FTPs that go dormant for too long.

The code: (ftpmon.c)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


The output:

$ ftpmon
Connected to (
220 (vsFTPd 2.0.1)
ftp> waitpid(): Interrupted system call

Why am I getting the ftp> prompt? If the dup2() works, shouldn't it be taking input from my script and not my terminal? In stead, it does nothing, and winds up getting killed after 30 seconds. The log file is created, but it's empty after the run.

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Programming :: Redirecting Stdin / Stdout And Stderr And Finding Files Name And Other Stats?

Aug 8, 2010

I'm working on an application used for backup/archiving. That can be archiving contents on block devices, tapes, as well as regular files. The application stores data in hard packed low redundancy heaps with multiple indexes pointing out uniquely stored, (shared), fractions in the heap.

And the application supports taking and reverting to snapshot of total storage on several computers running different OS, as well as simply taking on archiving of single files. It uses hamming code diversity to defeat the disk rot, instead of using raid arrays which has proven to become pretty much useless when the arrays climb over some terabytes in size. It is intended to be a distributed CMS (content management system) for a diversity of platforms, with focus on secure storage/archiving. i have a unix shell tool that acts like gzip, cat, dd etc in being able to pipe data between applications.


dd if=/dev/sda bs=1b | gzip -cq > my.sda.raw.gz

the tool can handle different files in a struct array, like:


enum FilesOpenStatusValue {
FileIsClosed = 0,


Is there a better way of getting the file name of the redirected file, (respecting the fact that there may not always exist such a thing as a file name for a redirection pipe).
Should i work with inodes instead, and then take a completely different approach when porting to non-unix platforms? Why isn't there a system call like get_filename(stdin); ?

If you have any input on this, or some questions, then please don't hesitate to post in this thread. To add some offtopic to the thread - Here is a performance tip: When doing data shuffling on streams one should avoid just using some arbitrary record length, (like 512 bytes). Use stat() to get the recommended block size in stat.st_blksize and use copy buffers of that size to get optimal throughput in your programs.

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General :: Redirecting Output From Stderr?

Dec 1, 2010

I have seen a post where someone was explaining the virtuality of stdout and stderr and that it can be redirected with e.g. 2>file.txt but this apparently is not working for me!
I have a CUPS filter with fprintf(stderr,...)

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Ubuntu :: Sort The Output To A Text File So That It Prints To The Text File At 1 Process Per Line?

Feb 6, 2011

im trying to output a list of running processes via a shell script. At the moment i got this which outputs the processes to a text file called out.

echo $(ps aux) >>out

The problem is though, the processes are all just one big block of text which makes it hard to read. Does anyone know how to sort the output to a text file so that it prints to the text file at 1 process per line? I know its probably simple but im very new to linux.

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General :: Output A Text File In Proper Format?

Mar 4, 2010

it compares two files using md5... if they are same , a corresponding character is output to a text file .. but the problem is it gets appended by default.. is there any way to output in a normal way because the text is a message and it should be of proper format
here is my script


g=`tail -1 new.txt|head -n 1`
array=( a b c d e f g h i j k l m n o p q r s t u v w x y z )
for((i=1 ; i <$g+1 ; i++))


the message is supposed to be hello , i need to get rid of the endlines somehow..

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General :: Output To A Text File, The Results Of Compound Command?

Jul 28, 2010

How to output to a text file the compound command:

find -type f -print0 | xargs -0 grep -l "desired text"
I have not been able to find the answer.


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General :: Read Data From Text File And Output Into A Table?

Apr 12, 2010

I'm having a slight dilemma on reading data from a text file and outputting it into a table then displaying it. Basically I'm writing a shell script that takes information from text files then outputs the data into a table with 4 headings.he extracting of the data is fine, but creating a table i'm having problems with. I think it is possible to do it using the awk function, but so far i'm having a lot of difficulties.

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General :: Iperf Won't Export All Command Output To Text File?

Oct 18, 2010

I've created a script to test network speeds but I've run in to a little problem. The command outputs this:

Client connecting to, UDP port 5001
Sending 1470 byte datagrams


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General :: Write Expdp Output In A Text File Using A Shell Script ?

Feb 7, 2011

I want to write expdp output in a text file using a shell script

If i write like below:

It will write whatever is there in log file to text file

But, sometimes export fails with out start taking export (without generating log file) because of job already exists error. such times, we dont know about that error until we check manually... so i wrote like below:

But still it is not writing anything in to text file using above stmt...

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Programming :: Pipe Output To 2 Files But Not STDOUT?

Mar 24, 2011

I want to have the output of a program go to 2 different files but not going to standard out. Is there a way to do this in bash? I know that in Z shell its really easy. omething like: Code: echo "test" >> file1 >> file2 Would work. But in Bash it doesn't seem that easy. I know that tee will send the output to 2 files but it also sends it to STDOUT.Something like:Code: echo "test" | tee -a file1 file2 Would put the word "test" in file1, file2, and STDOUT. Is there a way to just send the output to file1 and file2?

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General :: How To Echo The File To Stdout

Sep 26, 2010

I have a process which logs output to log.txt. If I want to see the process's status in real-time, is there a way to echo that output to stdout instead of opening the log in a text editor and constantly reloading?

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General :: Able To Write On Stdout But Not In A File

Aug 16, 2011

I want to keep a trace of the URL I visit, so I use a command line like this:

tcpdump -ien1 -v -X 'tcp port 80' | sed -nl
's/^.0x[0-9a-f]{4}:.{43}(.)$/1/p' |perl |perl -pe


I also tried redirecting stdout and stderr to /tmp/out, it's still empty. The file has write access. I have no idea what it can be. Is there anything else than stdout and stderr?

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Software :: Qt Creater 4 - C++ & Stderr - Use QDebug() To Print Out Stderr Messages?

Jul 27, 2010

Can I use qDebug() to print out stderr messages? If I just use qDebug() << stderr; I get hex output.

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Debian Programming :: Stdout Piped To Awk -> Terminal Output Stutters

May 5, 2013

I'm piping stdout from mplayer to awk, but the output stutters.

Code: Select allmplayer audiofile.m4a 2>&1 | awk -vRS="
" '$1 ~ /A:/ {print $0; fflush();}'

Instead of a steady output of lines to the terminal, output only occurs after a few seconds, between 6 or 12. This happens whether the input is from mplayer or avconv/ffmpeg. This never used to happen (a few years ago) so I wondered whether an awk update caused this to happen.

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Programming :: Expect: Prevent Output From Spawned Process To Appear On Stdout?

Jul 3, 2009

I have this expect process:

spawn -noecho telnet
expect {


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General :: Get Output Of Text File Containing Account Number, Debit Amount, Credit Amount,date Using Shell Script?

Apr 9, 2011

How to get output of text file containing account number, debit amount, credit amount,date using shell script?

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Ubuntu :: Output Data From Text File Into A Table?

Apr 13, 2010

I'm having a slight dilemma on reading data from a text file and outputting it into a table then displaying it. Basically I'm writing a shell script that takes information from text files then outputs the data into a table with 4 headings. The extracting of the data is fine, but creating a table i'm having problems with. My code extracts the data outputs the string to another file which works fineThe text file looks like this

mr smith 1 purchase oct 2007
mrs smith 2 purchase nov 2006
i want it to look like this


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Ubuntu Servers :: Backup-script - Ssh - Output Result To Text File?

Nov 5, 2010

Im using this script to save a backup to a NAS, however i want to print the result to a file that later can be mailed to me.


tar --totals -czf - /var/www | ssh user@host "cat > /backup_path/`date "+%Y-%m-%d"`.tar.gz"

i have tried just adding ">> logfile.txt" at the end of the command, but that obviously does not work. How should i do this?

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Programming :: Eedirect Stderr To File Including Name Of File With Error

Jul 26, 2010

It's kind of pointless imo for the types of errors that Exiv2 reports on to be written to a text file without some reference to the name of the file that prompted the error message in the first place. Is there a way to have bash identify the file that prompts the error and writes its name to the same file as the error (in my case, frencherrors.TX)?I've tried a painfully simple syntax that does something identical to a 2>&1 'suffix", namely 2 $file>>frencherrors.TX. It makes sense to me as written, but I'd like to know why I'm getting nothing on screen and everything directed to the file when what I want to see in the latter are the filenames causing the errors along with the text of the errors.

Is there another level one has to bore down into before they can garner this kind of output? If so, what is it and how does one invoke it in bash?

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Software :: Redirect Stdout To File Produces Blank File

Dec 27, 2008

I cannot redirect output from commands such as iptables, iptables-save, and ifconfig. For example, any of the following DOESN'T work ( as root ):

iptables > tmp
iptables-save > tmp
ifconfig > tmp
The file tmp is ALWAYS blank, that is, 0 bytes in size. Wackier things DO work, such as:

echo "`iptables-save`" > tmp
iptables-save | tee tmp
Other commands like:

ls > tmp
DO work as expected.

Note that this problem happens regardless if I log-in remotely via ssh or locally on the computer in question. I am clueless as to what is causing this. Any ideas?The box is running 2.6.25-14.fc9.i686 and boots to runlevel 3. The modifications I've made to the box since installing the OS are things like compiling/installing latest OpenSSH,OpenSSL,httpd,BerkeleyDB,subversion,zlib etc -- nothing really out of the ordinary I'd say.

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General :: Output The Mirror Image Of This Text?

Mar 3, 2011

I copied and pasted this from someones signature.d/__How did they write that horizontally mirrored 'd' at the end? How do I do that in Linux?

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Programming :: Sed To Output Block Of Text If Specified Text Is Matched?

Feb 13, 2010

I am trying to find sed command combination to print out the "start command" line, the id line and all lines between "details" and "stop command" only if "error" exists. Here's the original output (test.txt):

start command
id 1


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General :: How To Color Part Of Text Of Output To Console

Jun 9, 2011

Is there a way to color particular words printed on console based on user preference? For example I need to color text 'error' when a particular program is compiled.

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