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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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:
Code:
$ command 2>&1 > log | tee -a log log.err
But then in log first the stdout appears, and then stderr.
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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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Jul 3, 2009
I have this expect process:
Code:
spawn -noecho telnet my.host.com
expect {
[code]...
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Apr 5, 2011
For instance, suppose I want to pipe the output of ps -A to a gtkdialog table.
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May 3, 2011
I want to pipe the output of ls in a folder to a file (lets call it test.txt) but when i do so, but when i do ls > test.txt in test.txt there is also test.txt (logical
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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:
Code:
/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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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.
Example:
dd if=/dev/sda bs=1b | gzip -cq > my.sda.raw.gz
the tool can handle different files in a struct array, like:
Code:
enum FilesOpenStatusValue {
FileIsClosed = 0,
FileIsOpen,
[code]....
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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Mar 2, 2011
I've written a simple server in linux used fork to create a FIFO pipe.The server create two FIFO pipe.One for server read data from client and write data to client.Then another pipe for client read data from server and write data to server.When the server read data from a client used server-pipe and then write data to client.But ,if the client no read open the pipe,the server side write will be crashed because of a broken-pipe SIGPIPE. How to check whether the read side is opened?Or,how to catch the SIGPIPE,and then my server will still execute on,not crashed!!
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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:
Code:
#!/bin/bash
echo TR3_1 > printers.txt
snmpget -v 1 -c public 10.168.**.* SNMPv2-SMI::mib-2.43.10.2.1.4.1.1 &>> printers.txt
[Code].....
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Aug 19, 2009
I have a bug where WoW under wine is crashing my computer, and I want to get the data from the console, so I want to put it in a file, but I don't know how! None of the piping tutorials online helped at all.
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Jan 13, 2010
I want to kill a specific program with the kill -9 pid in a hole command. How do I pipe and kill the output from this command? pidof transmission |
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Jul 21, 2011
I need to pipe the output of date command, to form a command like this:
mycommand -f 20110721
where 20110721 is current YearMonthDay.
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Jun 29, 2010
How can I pipe the output of a shell command into a new buffer in Vim? The following obviously wouldn't work, but you can see what I'm getting at:
:!echo % | :newtab
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Mar 20, 2010
I'm trying to use the output from gdialog's input box in another command with no success. code...
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Sep 30, 2010
Is there a way to process the output of a locate command on the spot within bash. The output is 3 lines, ex:
Code:
[root@server confluence]# locate .timestamp
/opt/confluence/confluence-persistent/index/.timestamp
[code]....
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May 25, 2011
In a terminal in OSX I can pipe output to pbcopy and then go into a web browser and paste it. I tried this in Linux with xcopy but when I switch to the browser it just overwrites the clipboard with with whatever was in it the last time the browser was used. What works like pbcopy in Linux?
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Jul 22, 2010
I'm following the "The Perfect Server - Fedora12 x86_64 [ISPConfig 3]" instructions and I am encountering an error when trying to build the rpm for courier-imap (from page 4 of the HOWTO).
The command I run is:
Code:
rpmbuild -ta courier-imap-4.6.0.tar.bz2
The error is below:
Code:
INFO: LOGIN, user=confmdtest, ip=[127.0.0.1], port=[0], protocol=SMAP1
INFO: LOGOUT, user=confmdtest, ip=[127.0.0.1], headers=0, body=0, rcvd=26, sent=610, time=0
sort: fflush failed: standard output: Broken pipe
[code]....
RPM build errors: Bad exit status from /var/tmp/rpm-tmp.85697 (%build)
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Jun 30, 2009
I want to parse my mail log file and reuse the results but I'm having a hard time structuring the syntax. Something like:
Code:
grep hostname /var/log/mail.log |
grep NOQUEUE: |
sed -e 's/hostname postfix/smtpd/[[0-9]*]: //g'
at this point I want to redirect what I have in hand to a file but also ... fork? or split? whatever the term, to continue onward so that I can pipe the results further into wc -l or sort or programX. without having to re-loop through that huge log file.
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Jan 22, 2010
In this example, why does blacklist end up in the file blacklist and $a end up in stdout?
[code]...
The desired result is to have a file containing the results of lsmod which had the first word on the line beginning with snd_ copied into another file preceded by the word blacklist.
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May 12, 2009
I have a little complex Makefile system. A parent Makefile call dozens of Makefiles in subdirctories. And the subdirctory Makefile calles shell script to do real building. I want to grab all output this Makefile system generate. So, i employ "make 2>&1 > make.log". but not all output messages are filed into make.log. The message generated by sub-makefile called shell script cannot be recorded into make.log. And another curiouse thing is, if i launch "make 2>&1 > make.log" in a perl script, all output do be sent into make.log.
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Aug 12, 2010
Why doesn't this work?
Code:
cat | myvar=$(</dev/stdin) <<EOS
This is some content
EOS
echo "$myvar"
i have also tried several variants of cat in place of the redirection.
Code:
$(cat -)
$(cat)
$(cat /dev/stdin)
None of the variants print "This is some content"
I have a version that works:
Code:
myvar=$(cat <<EOS
This is some content
EOS
)
echo "$myvar"
but i don't like the syntax and it doesn't play nice in my editor with code folding.
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Jul 7, 2010
I wanted formated output of all the files under a particular directory. I am trying to use find.Something like find -P ./ -type f -name '*.cpp' -printf "%p "I want all the files with specific extension like .c .cpp .h to be printed out separated by space. One more thing i want is absolute path names instead of relative.
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May 21, 2011
I have a huge database of students, I would like extract these data and write to individual file for each students.
I am running a loop in shell program (.sh file), the output of each run in the loop need to redirected to a file with variable name.
I tried the following line, but it did not work, where BodyMsg is the data and Rollno is the students roll number.
echo $BodyMsg > $RolNo".html"
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Jan 26, 2011
I have wrote a 1 line command that parses a file, locates the IP Address in the file and then trims the output the way I want it, and then sorts numerically and by uniqueness and then >> appends to output.txt
I can get all the IP's into 1 file "output.txt", but what I am really looking for is some type of way to create a text file, for each IP it finds labeled xxx.xxx.xxx.xxx.txt and also put that ip address into that file..
xxx.xxx.xxx.xxx = the ip address it finds
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Jan 17, 2014
I am writing a script that calls a program which writes a lot of lines to stdout continuosly. If the last line in stdout has some regex, THEN, certain variables are updated. My problem is that I don't know how to do that.
A simplified example would be (it's not my exact case, but it I write it here to clarify): suppose I issue a ping command (which writes output to stdout continuously). Every time that the response time is t=0.025 ms, THEN, VARIABLE1=(column1 of that line) and VARIABLE2=(column2 of that line).
I think the following code would work in awk (however, I want the variables in bash and I don't know how to export them)
Code: Select allping localhost |awk '{ if ( $8 == "time=0.025" ) var1=$1 var2=$2}'
In the previous code, awk analyzes each line of the output of the ping command as soon as it is created, so the variables $var1, $var2, ... are updated at the appropriate time. But I need the "real-time" updated values of $var1, $var2 in bash, for later use in the script.
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Oct 26, 2010
To redirect standard output to multiple files:
Code:
echo Test | tee file1 file2
My problem is that the word "Test" still displays to the screen? I want same effect as:
Code:
echo Test > file1
but with multiple file redirection.
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Aug 23, 2010
I am trying to develop a method of reading files generated by other programs. I am trying to find the most versatile approach. I have been trying bash, and have been making good progress with sed, however I was wondering if there was a "standard" approach to this sort of thing. The main features I would like to implement concern reading finding strings based on various forms of context and storing them to variables and/or arrays. Here are the most general tasks:
a) Read the first word(or floating point) that comes after a given string (solved in another thread)
b) Read the nth line after a given string
c) Read all text between two given strings
d) Save the output of task a), task b) or task c) (above) into an array if the "given string(s)" is/are not unique.
e)Read text between two non-unique strings i.e. text between the nth occurrence of string1 and the mth occurrence of string2
As far as I can tell, those five scripts should be able to parse just about any text pattern. I am by no means fluent in these languages. But I could use a starting point. My main concern is speed. I intend to use these scripts in a program that reads and writes hundreds of input and output files--each with a different value of some parameter(s).
The files will most likely be no more than a few dozen lines, but I can think of some applications that could generate a few hundred lines. I have the input file generator down pretty well. Parsing the output is quite a bit trickier. And, of course, the option for parallelization will be very desirable for many practical applications.
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Nov 2, 2010
I have encountered a problem:I have "while" loop; at each run a set of outputs is produced but then I need to shift them into a corresponding folder ; otherwise next run the new outputs will be over-written. Furthermore, I need to pipe what I have on the screen inside a file. I have put my code in the following:
Code:
# !/bin/bash
jf="GeoQuery.jar"
[code]...
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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>
[code]....
The output:
$ ftpmon
Connected to gila-crstest.gilacorp.com (172.16.20.8).
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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