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• Is there a way to prevent output from backgrounded tasks from covering the command line in a shell?

  - by Chris Pick

  I would like to be able to run task(s) in the background of a shell and not have their output to stdout or stderr cover the command line at the bottom. Frequently I need to run other commands to interact with the background processes and would like to do so from the same shell without having to open up another terminal or using multiplexer to split the terminal like screen. Ideally there would be some setting that I just don't know about (I commonly use bash or ksh), but a new or different shell or a script would be fine by me. I'm open to any suggestions and appreciate any help, thanks.

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• An SQLite/STDIN Conundrum, Specific to AIX

  - by mikfreedman

  Hi there! I'm been playing around with SQlite at work, specifically with trying to get the sqlite3 command line tool to accept stdin instead of a file. Sounds easy enough, on linux you can execute a command like: echo 'test' | sqlite3 test.db '.import /dev/stdin test' unfortunately - our machines at work run AIX (5 & 6) and as far as I can tell, there is no equivalent to the virtual file /dev/stdin. I managed to hack together an equivalent command that works on AIX using a temporary file. echo 'test' | cat - > /tmp/blah ; sqlite3 test.db '.import /dev/stdin test' ; rm /tmp/blah Now, does it need to use STDIN? isn't this temporary file thing enough? Probably, but I was hoping someone with better unix-fu had a more elegant solution. note: the data I would like to import is only provided via STDOUT, so that's what the echo 'test' command is all about

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• Bash - Program is writing directly to terminal

  - by Salis

  Valve's dedicated server for the Source Engine (srcds_run) on Linux writes directly to the terminal, not stdout. I want to run it as an /etc/init.d daemon on Debian 6, and I'd like to redirect/capture the output to a file. How can I do that? And better yet, why would they output directly to the terminal, is there any benefit in doing that? I suppose I could start another bash instance just for srcds_run, but that seems like a dirty solution, and I still don't know how to redirect the output.

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• 7zip: how to extract to std output?

  - by Jason S

  I have 7z 4.65 and am trying to extract a single file to standard output. The 7z command-line help says -so is the command-line parameter to extract to standard output, but when I try this: >>> 7z e -so dist\dlogpkg.jar META-INF/MANIFEST.MF 7-Zip 4.65 Copyright (c) 1999-2009 Igor Pavlov 2009-02-03 Error: I won't write data and program's messages to same terminal how can I fix this? There doesn't seem to be a command line param to suppress the normal 7z stdout messages. (edit: the equivalent operation in "unzip" would be unzip -p dist\dlogpkg.jar META-INF/MANIFEST.MF which works fine. But I'd like to use 7z for various reasons.)

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• Limit on WMIC requests from a Windows Service

  - by Anders

  Hi all, Does anyone know if there is limit on how many wmic requests Windows can handle simultaneously if they are originating from a Windows service? The reason I'm asking is because my application fails when too many simultaneous requests have been initiated. I don't get any data back from the application. However, If I compile the Python application and run it as a stand alone application all will work fine. The wmic calls are looking like this: subprocess.Popen("wmic path Win32_PerfFormattedData_PerfOS_Memory get CommittedBytes", stdout=subprocess.PIPE, stderr=subprocess.PIPE) This makes me wonder, is there a limit Windows Services and what they can perform? I mean, if the .exe file can handle all requests, then it must be something to do with the fact that I have compiled it as a Windows service.

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• Python: Check existence of shell command before execution

  - by Gabriel L. Oliveira

  Hi all. I'm trying to find a way to check the existence of a shell command before its execution. For example, I'll execute the command ack-grep. So, I'm trying to do: import subprocess from subprocess import PIPE cmd_grep = subprocess.Popen(["ack-grep", "--no-color", "--max-count=1", "--no-group", "def run_main", "../cgedit/"], stdout=PIPE, stderr=PIPE) Than, if I execute cmd_grep.stderr.read() I receive '' like the output. But I don't have the command ack-grep on my path. So, why Popen is not putting the error message on my .stderr variable? Also, is there a easyer way to do what I'm trying to do?

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• Grep the whole body of a function

  - by dotancohen

  Supposing I know that someFile.php contains the definition for someFunction(). How would I go about displaying the whole body of the function in stdout? If I know that the body is 10 lines long then I would use cat someFile.php | grep -A 10 "function someFunction" [1] but in reality the function could be any arbitrary length. I figured that with sed I could use Vimesque commands such as /function someFunction<Return>/{<Return>% [2] but I can't figure out exactly how to format it. Ideally, the PHPDoc before the function would be output along with the function. Any help or links to the appropriate fine manual would be appreciated. Thanks! [1] I know that the cat is redundant, but I find this format easier to read. [2] Find the function definition, go to the opening brace, go to the close brace

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• gnu coreutils split verbose flushed?

  - by 130490868091234

  When using the GNU coreutils split command with verbose mode, how can I make the lines that appear in the STDOUT be flushed with respect to the time when the file has finally been created? Fore example, running it like this: ~/coreutils/bin/split --verbose -d -u -l 10000000 1>out & tail -f out creating file `x00' creating file `x01' creating file `x02' [...] I would have expected the line creating file 'x00' to have appeared in file out after the file has been completely written, but instead, it seems like nothing is written into out until the whole file has been finally processed. Is there a way to change this behavior?

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• Windows 7 connect to Lion file sharing

  - by McKvack

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• bash pipe construct to prepend something to the stdoutput of previous command

  - by AndreasT

  I want to use sendmail to send me stuff and want to do it in a oneliner. echo "mail content" | sendmail emailataddres.com Sends it without subject. The subject line must come before the Mail content, so I am looking for something along the lines of: echo "mail content" | prepend "Subject: All that matters" | sendmail emailataddres.com sed and awk tend to be really awkward to use and remember. EDIT:Just to clarify: echo "Mail content" is just an illustrating example. I need to be able to prepend stuff to stdout streams from any source. e.g.: ifconfig, zcat, etc..

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• SSH + MysqlDump Remote Backup Script

  - by bundini

  I'm trying to issue a remote mysqldump command, redirect stdout to a dmp file, then tar that up. I'm a bit confused as to how to do the redirection bits over ssh: i.e. ssh [email protected] mysqldump $dbname -u admin -p > dbdump.dmp && tar cvzf dbdump.tar.gz dbdump.dmp Issues: 1) I'm not providing the password because I want it to prompt me. Will an ssh remote command deal with this? 2) What's the deal with the syntax? Do I want to use quotations, or don't I? What happens with the redirects and pipes? Do those have to be escaped or formatted in some special fashion.

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• How can I use a script to control a VirtualBox guest?

  - by TheWickerman666

  Refer to : Launch an application in Windows from the Ubuntu desktop I was wondering if Takkat could elaborate on the actual execution i.e. howto in the script file. This will be greatly helpful. Thanks in advance my script file InternetExplorerVM.sh looks like this, execution is /path/to/InternetExplorerVM.sh "C:\Program Files\Internet Explorer\iexplore.exe" #!/bin/bash # start Internet Explorer inside of a Windows7 Ultimate VM echo "Starting 'Internet Explorer' browser inside Windows7 virtual machine" echo "" sleep 1 echo "Please be patient" VBoxManage startvm b307622e-6b5e-4e47-a427-84760cf2312b sleep 15 echo "" echo "Now starting 'Internet Explorer'" ##VBoxManage --nologo guestcontrol b307622e-6b5e-4e47-a427-84760cf2312b execute --image "$1" --username RailroadGuest --password bnsf1234 VBoxManage --nologo guestcontrol b307622e-6b5e-4e47-a427-84760cf2312b execute --image "C:\\Program/ Files\\Internet/ Explorer\\iexplore.exe" --username RailroadGuest --password bnsf1234 --wait-exit --wait-stdout echo "" echo "Saving the VM's state now" VBoxManage controlvm b307622e-6b5e-4e47-a427-84760cf2312b savestate sleep 2 #Check VM state echo "" echo "Check the VM state" VBoxManage showvminfo b307622e-6b5e-4e47-a427-84760cf2312b | grep State exit My apologies for any mistakes, this is my first time posting on askubuntu.Thanks a ton in advance. This has been very helpful. Need this for BNSF guests, their Mainframe emulator works exclusively on Java enabled Internet Explorer.

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• Windows 7 connect to Lion file sharing

  - by Automaton

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• Why does PsExec hang after successfully running a powershell script?

  - by Matt

  The script is fairly straight forward. Simply tries to start a bunch of windows services. Execution locally works fine when on the target machine. The script is actually executing fine as well when done via PsExec, it just never returns until I hit the "enter" key on my CMD prompt. This is a problem, because this is being called from TeamCity, and it makes the Agent hang waiting for PsExec to return. I've tried the following: Adding an exit and exit 0 at the end of the Powershell script Adding a < NUL to the end of the PsExec call, per the answer in this SF question Adding a > stdout redirect This is how I am actually calling psexec: psexec \\target -u domain\username -p password powershell c:\path\script.ps1 No matter what I do, it hangs until I the locally on the cmd prompt. After I hit enter, I get the message: powershell exited on target with error code 0.

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• VMware vCetner tomcat log files missing

  - by sttaq

  I have upgraded to a trial version of vCenter 5.1 from 5.0. Previous versions used to have tomcat log files inside the tomcat\logs folder. But since I have update I have noticed that tomcat is not writing any new log files. The log files were of the following format: vctomcat-stderr.XXXX-XX-XX.log vctomcat-stdout.XXXX-XX-XX.log I would like to know if there is a way by which we can configure tomcat (which is shipped with vCenter) to produces these log files? Also, VMware seems to have removed that Configure Tomcat application that they used to ship with the older version. Any reasons for this?

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• Error running Solr

  - by Jon H

  I'm trying to install Apache Solr for Plone, via collective.solr. I've followed the instructions above, and extended my buildout with: [buildout] extends = buildout.cfg https://github.com/Jarn/collective.solr/raw/master/buildout/solr.cfg [instance] eggs += collective.solr bin/buildout runs fine, however, when I try bin/solr-instance fg I get the following error: Traceback (most recent call last): File "bin/solr-instance", line 114, in <module> start(False) File "bin/solr-instance", line 43, in start stdout=logfp, stderr=logfp).pid File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1139, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory Graceful stop What am I missing / doing wrong?

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• looping .mpeg dump

  - by Matt Cook

  Need to dump an MPEG2 file in a loop, either to stdout or a named pipe. This works: $ { while : ; do cat myLoop.mpg; done; } | vlc - This works on a text file containing "1234\n": $ mkfifo myPipe $ cat test.txt > myPipe & < myPipe tee -a myPipe | cat - (it correctly loops, outputting "1234" on every line). Why does the following NOT work? $ cat myLoop.mpg > myPipe & < myPipe tee -a myPipe | vlc myPipe I'm primarily interested in re-writing the first statement to remove the improper "cat myLoop.mpg" statement. Will be inputting into VLC, or into FFMPEG and then piped into VLC.

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• Hiding "Syntax OK" from apache2ctl output

  - by Oscar Barrett

  I am checking whether a particular apache module is installed using apache2ctl -M. When listing the modules, apache runs a syntax check on the configuration files which prints out "Syntax OK" if everything is fine. However, this message doesn't seem to be coming from STDOUT or STDERR as it shows even if all output is redirected to /dev/null. i.e. $ sudo apache2ctl -M Loaded Modules: core_module (static) log_config_module (static) ... Syntax OK $ sudo apache2ctl -M >/dev/null Syntax OK How is this being outputted, and is it possible to hide?

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• How to pipe differently the body of the curl answer and the printed output?

  - by Antoine Lizée

  I would like to print in the command line some output of curl, like the http headers, followed by the body of the answer processed by a stdin/stdout program. For instance: Print the status code: curl -s -w "%{http_code} \\n" -o "/dev/null" http://myURL.com And then process the output with a json parsing tool: curl -s http://myURL.com | python -mjson.tool I would like to do both with one command, and I have the feeling that it may be possible thanks to the -o option that makes the difference between the output of curl and the actual answer from the query. The problem is that -o writes directly to a file. Somebody's got a hack?

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• scp -q isn't quiet between different hosts

  - by pythonic metaphor

  So scp -q file host:file and scp -q host:file file are both quiet, i.e. don't give the progress meter. But when I run scp -q host1:file host2:file, I still get the progress meter as well as a Connection to host1 closed. message. The progress meter can be gotten rid of by redirected stdout to /dev/null (although I'd rather not have to), but the connection closed messages comes on stderr, which I definitely want to keep in case there's a real error. How can I make scp quiet? Do I have to run ssh host1 "scp -q file host2:file"?

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• btrfs won't run from cron

  - by Mikkel

  I'm trying to set up a cron job to create a btrfs subvolume snapshot of my root partition. The command works perfectly if I run it from the command line, but nothing happens at the scheduled cron time. I've tried piping to logger and redirecting stdout/stderr to file, and not only is there no content, the file I'm logging to isn't even created. The cron command I have is as follows: 0 0 * * * /sbin/btrfs subvolume snapshot / "/snapshots/$(date +%Y-%m-%d)" I've tried prefixing it with /bin/bash, but that makes no difference. What am I missing?

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• Handling expected supervisord exit codes

  - by Mulkave

  I am using supervisord inside a Docker container to manage my running processes and would like to also use it to trigger certain commands - run them once and expect them to exit with 0. Here's one example: [program:central-seed-posts] command = /usr/bin/php /var/www/app/artisan post autostart = false autorestart = false startsecs = 3 startretries = 0 exitcodes = 0 stderr_logfile=/tmp/central/posts-stderr-supervisor.log stdout_logfile=/tmp/central/posts-stdout-supervisor.log And I'm using nsenter's docker-enter with supervisorctl start central-seed-posts to trigger it but I would also like to handle a successful exit instead of supervisor telling me ERROR (abnormal termination) Does it have to do with supervisor events ?

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• Title: Better logging for cronjob output

  - by Stefan Lasiewski

  I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data to a central Nagios sever. This send_nsca script also prints a single status line to STDOUT, indicating success or failure. 0 * * * * root /usr/local/nagios/sbin/nsca_check_disk This emails the following message to root@localhost, which is then forwarded to my team of sysadmins. Spam. forwarded nsca_check_disk: 1 data packet(s) sent to host successfully. I'm looking for a log method which: Doesn't spam the messages to email or the console Don't create yet another krufty logfile which requires cleanup months or years later. Capture the log information somewhere, so it can be viewed later if desired. Works on most unixes Fits into an existing log infrastructure. Uses common syslog conventions like 'facility' Some of these are third party scripts, and don't always do logging internally.

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• Alternatives to y4mstabilizer; deshaking video

  - by Vi

  "Deshaking" means fixing the video captured from camera hold in hands. Is there open source video deshaker apart from y4mstabilizer from mjpegtools? Patch for mencoder is preferred. My current command line for processing video looks like: mplayer video_from_camera.avi -nosound -vo yuv4mpeg:file=/dev/stdout -really-quiet | y4mstabilizer -n -a 0.8 -r 30 -s 100 | mplayer -cache 1000 /dev/stdin -noconsolecontrols -vf crop=500:380:70:50,denoise3d=3:3:5:5 -vo yuv4mpeg:file=temporary.yuv y4mstabilizer is itself very unstable and often crashes (and it didn't work at all until I have patched memory allocation in it).

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• Improve efficiency when using parallel to read from compressed stream

  - by Yoga

  Is another question extended from the previous one [1] I have a compressed file and stream them to feed into a python program, e.g. bzcat data.bz2 | parallel --no-notice -j16 --pipe python parse.py > result.txt The parse.py can read from stdin continusuoly and print to stdout My ec2 instance is 16 cores but from the top command it is showing 3 to 4 load average only. From the ps, I am seeing a lot of stuffs like.. sh -c 'dd bs=1 count=1 of=/tmp/7D_YxccfY7.chr 2>/dev/null'; I know I can improve using the -a in.txtto improve performance, but with my case I am streaming from bz2 (I cannot exact it since I don't have enought disk space) How to improve the efficiency for my case? [1] Gnu parallel not utilizing all the CPU

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