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  • How to use parallel execution in a shell script?

    - by eSKay
    I have a C shell script that does something like this: #!/bin/csh gcc example.c -o ex gcc combine.c -o combine ex file1 r1 <-- 1 ex file2 r2 <-- 2 ex file3 r3 <-- 3 #... many more like the above combine r1 r2 r3 final \rm r1 r2 r3 Is there some way I can make lines 1, 2 and 3 run in parallel instead of one after the another?

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  • Can Ruby access output from shell commands as it appears?

    - by Ciryon
    My Ruby script is running a shell command and parsing the output from it. However, it seems the command is first executed and output saved in an array. I would like to be able to access the output lines in real time just as they are printed. I've played around with threads, but haven't got it to work. Any suggestions?

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  • What is the role/responsibility of a 'shell'?

    - by Rune
    Hi, I have been looking at the source code of the IronPython project and the Orchard CMS project. IronPython operates with a namespace called Microsoft.Scripting.Hosting.Shell (part of the DLR). The Orchard Project also operates with the concept of a 'shell' indirectly in various interfaces (IShellContainerFactory, IShellSettings). None of the projects mentioned above have elaborate documentation, so picking up the meaning of a type (class etc.) from its name is pretty valuable if you are trying to figure out the overall application structure/architecture by reading the source code. Now I am wondering: what do the authors of this source code have in mind when they refer to a 'shell'? When I hear the word 'shell', I think of something like a command line interpreter. This makes sense for IronPython, since it has an interactive interpreter. But to me, it doesn't make much sense with respect to a Web CMS. What should I think of, when I encounter something called a 'shell'? What is, in general terms, the role and responsibility of a 'shell'? Can that question even be answered? Is the meaning of 'shell' subjective (making the term useless)? Thanks.

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  • how to run multiple shell scripts in parallel

    - by tom smith
    I've got a few test scripts, each of which runs a test php app. Each script runs forever. So, cat.sh, dog.sh, and foo.sh, each run a php script, and each shell script runs the php app in a loop, so it runs forever, sleeping after each run. I'm trying to figure out how to run the scripts in parallel, and at the same time, see the output of the php apps in the stdout/term window. I thought, simply doing something like foo.sh > &2 dog.sh > &2 cat.sh > &2 in a shell script would be sufficient, but it's not working. foo.sh, runs foo.php once, and it runs correctly dog.sh, runs dog.php in a never ending loop. it runs as expected cat.sh, runs cat.php in a never ending loop *** this never runs!!! it appears that the shell script never gets to run cat.sh. if i run cat.sh by itself in a separate window/term, it runs as expected... thoughts/comments

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  • How to secure svn+ssh checkout users?

    - by vvanscherpenseel
    All our SVN repositories are hosted on a dedicated machine on which all the developers have access. Every now and then we need to checkout a repository on a machine we don't own or operate ourselves. Currently we all use our own system (SSH) account for this, but instead I would like to use some generic 'checkoutsvn' user that can be used for this. This user is only used for checking out from a repository, but should not be allowed to log in to the system (no shell access). I tried to do this by setting the default shell of that account to /sbin/nologin but then SVN fails, as apparently svn+ssh requires shell access. How do you do this? Is there a good solution for this?

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  • How to write scripts that can run in bash and csh?

    - by Victor Liu
    I'm not sure if this is even possible, but is there a way to write shell scripts that can be interpreted by both the Bourne shell as well as C shell? I want to avoid simply checking for the shell and running a shell-specific code. If this is possible, are there any guides on how to do it? I have always written my scripts for Bourne shell syntax, and I know next to nothing about csh, so this may be a stupid question. I have Google'd for the differences between shells, but there is little information (as far as I can tell) on its implications for scripting.

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  • ip namespace non-root shell

    - by user2730940
    I am trying to run ssh command to another ip namespace. I can do it right now, but it runs as root. I want to run it as a normal user. I want to know if there is a way to enter a non-root shell in another network namespace. I know you can use this to enter a root shell in another namespace: sudo ip netns exec <namespace> bash Alternatively, is there a way to run single commands as a non-root user? I know you can run commands as root with this: sudo ip netns exec <namespace> <command>

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  • iPhone Shell - is there any?

    - by alee
    While working on iphone security architecture, i came to know that i can run applications from other applications in iphone. referring to the following url http://iphonedevelopertips.com/cocoa/launching-other-apps-within-an-iphone-application.html for example, i can put a link in a website with following hyperlink skype:// will result skype to run and call at particular number. Now i have few concerns here. is there a shell running in background in iphone, so that it allows other application to run basic app commands. if the above statement is true then how can i enable or run commands directly into iphone shell? if above statements are false, then could you please explain how these commands are being executed? is this part of iPhone SDK? or this funcationality is iPhone OS

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  • Confusion over terminology SSH, Shell, Terminal, Command Prompt and Telnet

    - by byronyasgur
    I don't usually use SSH if I can get away with it, but if I have to I do of course, and I've seemingly done this for years while still managing to remain slightly confused about these different terms ... from my basic research, this is my understanding, could someone verify/correct this? Telnet ... before SSH, not secure SSH ... ( secure shell ) the general name of the system/protocol Shell ... short name for SSH Command Line/Command Prompt ... the windows version Terminal ... the Unix version, also used by apple. Two further questions: What is the Linux version commonly called, is it just called SSH ? What is bash ?

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  • How to execute with /bin/false shell

    - by Amar
    I am trying to setup per-user fastcgi scripts that will run each on a different port and with a different user. Here is example of my script: #!/bin/bash BIND=127.0.0.1:9001 USER=user PHP_FCGI_CHILDREN=2 PHP_FCGI_MAX_REQUESTS=10000 etc... However, if I add user with /bin/false (which I want, since this is about to be something like shared hosting and I don't want users to have shell access), the script is run under 1001, 1002 'user' which, as my Google searches showed, might be a security hole. My question is: Is it possible to allow user(s) to execute shell scripts but disable them so they cannot log in via SSH?

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  • chroot'ing SSH home directories, shell problem.

    - by Hamza
    Hi folks, I am trying to chroot my SSH users to their home directories and it seems to work.. in a strange way. Here is what I have in my sshd_config: Match group restricthome ChrootDirectory %h The permissions on the user directories looks like this: drwxr-xr-x 2 root root 1024 May 11 13:45 [user]/ And I can see that the user logs in successfully: May 11 13:49:23 box sshd[5695]: Accepted password for [user] from x.x.x.x port 2358 ssh2 (with no error messages after this) But after entering the password the PuTTY window closes down. This is a wild guess, but could it be because the user's shell is set to /bin/bash and it can't execute because of the chroot? If so, could you give me pointers on how to fix it? Would simply copying the bash binary into user's home directory and modyfying the shell work? How would I deal with the dependencies, ldd shows quite a few of those :) Comments/suggestions will be appreciated. Thanks.

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  • jZip isn't integrating with Windows 7 shell

    - by Aayush
    I installed jZip in my new windows 7 64 bit OS. but it doesn't seem to integrate with the shell. It doesn't appear in the right click menu on any file(not even zip files). To zip a file I have to open jZip go to file-new and browse for the files and to extract compressed files I have to open the file in jZip then click on extract, there is no right click menu integration what so ever, although It used to have when I had jZip on the Windows 7 RC. I reinstalled checking the settings incase I made a mistake but I checked shell integration while installation. Don't know what it wrong? anyone know how I should solve this. Help..? Thanks!

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  • Alternative shell apps for OS X

    - by Joseph Silvashy
    This might sound ridiculous, but my eyes are tired of looking at the crappy font rendering in OS X's Terminal.app, is there anything you guys recommend? I know it's like one of those things that you can easily say, "It's shell! what more can you ask for!" but really, all these great methods for rendering fonts and anti-aliasing, and we developers haven't even integrated that into our most trusty tool... at least that I know of. Anyhow, let's discus shell alternatives, thoughts?

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  • linux shell, keep task alive for specified time

    - by liori
    Hello, I am looking for a tool to keep a task alive (restarting if necessary) for a specified amount of time (in seconds), and then kill it and stop. For example: keep_for 3600 rsync foo bar:faz should for try to synchronize a directory (restarting rsync in case of f.e. dropped connection), but explicitly kill rsync and stop respawning it after an hour. I tried to write a shell script for that, but it was surprisingly difficult to write, with lots of edge cases (like child process not getting killed, or shell escaping issues). So... maybe there already is a tool for that?

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  • something strange about Win-XP's command shell

    - by user1762055
    I wrote the following command in windows XP's command shell and something strange happened: C:\Folder1> copy sample.txt : Because of my typing mistake, I wrote ":" instead of "D:" ... but it copied the sample.txt to somewhere I cant find! I searched my whole HDD for sample.txt but the only instance of this file is the original one which is in C:\Folder1. Do you know where ":" path actually is in Win-XP command shell? You might say ":" is current path and the file has been copied onto itself but look at this: If you run that command for the first time, this will be the result: 1 file copied. but the next time you run that command it will ask you: overwrite sample.txt? (yes/no/all) So if it were writing the file onto itself, both results would have to be the same but they aren't. Thanks in advance for your help.

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  • Shell script only executes partially when run with CRON

    - by binaryorganic
    I've written a shell script that does the following: Retrieve mail from a POP3 account (using GetMail) Save a copy of that email to S3 (using AWS CLI) Email me the filesize of the email The script runs fine manually, and technically runs from CRON, but it only seems to be sending the email. The getmail and S3 bits don't seem to run. Everything I've read seems to hammer home the message that I need to be careful about relative paths and the like when using CRON, but I think I'm using absolute paths everywhere I need to be, so I'm stumped as to what the issue could be. My Shell Script is here: #!/bin/bash # Run GetMail getmail -r /PATH/TO/EMAIL/getmail.email # Save to S3 aws s3 cp /PATH/TO/SCRIPT/email-backup.mbox s3://XXXXXXXXXX/email-backup.mbox # Send Confirmation Email SUBJECT="EMAIL SUBJECT" EMAIL="[email protected]" # Get current filesize FILENAME=/PATH/TO/SCRIPT/email-backup.mbox FILESIZE=$(stat -c%s "$FILENAME") # Email Content EMAILMESSAGE="/tmp/emailmessage.txt" echo "EMAIL BODY" >$EMAILMESSAGE echo "" >>$EMAILMESSAGE echo "Current File Size: $FILESIZE bytes" >>$EMAILMESSAGE # Send the Mail /bin/mail -s "$SUBJECT" "$EMAIL" < $EMAILMESSAGE

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  • Auth failed running command from shell script

    - by CSchulz
    I try to run following command from shell script: svn checkout http://url/ --username user --password password --non-interactive --no-auth-cache . It fails always with following error: svn: OPTIONS of 'http://url/': authorization failed: Could not authenticate to server: rejected Basic challenge (http://url) Here the call out of my script: $(svn $command $url $auth --non-interactive --no-auth-cache .) Running the same command from the terminal works fine. What is the difference between running from shell script and terminal? EDIT: Here some version information: OS: Porteus 1.0 based on Slackware 13.3 Subversion: subversion-1.6.16-i486-1

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  • Windows Shell Programming book suggestion

    - by Lijo
    Hi, I am a web developer using C#. I would like to experiment with Windows shell programming in C#. Many people suggests that using managed applications for shell program, is dangerous. (Creation of separate instances for each process versus in process shell. Also version dependency) Frankly speaking, I am totally new to shell. Is there a book available, that will treat these topics; both through managed code and unmanaged code (but mostly towards managed code)? It would be great if that book is concise , for beginner and giving theoretical background of the shell. Please suggest…. Thanks Lijo

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  • How To Run A Shell Script Again And Again Having X Interval Of Time?

    - by Muhammad Hassan
    I have a shell script in my Ubuntu Server 14.04 LTS at ./ShellScript.sh. I setup /etc/rc.local to run the shell script after boot but before login using below code. Run this: sudo nano /etc/rc.local then add following and save. #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. #!/bin/bash ./ShellScript.sh exit 0 Now I want to run/execute this shell script again and again having 15min of time interval between every run after boot but before login. So Can I do it? Update 1:) When I run crontab -e then I got the following. Now What to do? no crontab for root - using an empty one Select an editor. To change later, run 'select-editor'. 1. /bin/ed 2. /bin/nano <---- easiest 3. /usr/bin/vim.basic 4. /usr/bin/vim.tiny Choose 1-4 [2]: After selecting 2, I got crontab: "/usr/bin/sensible-editor" exited with status 2 UPDATE 2:) Update ShellScript.sh like below... #!/bin/bash # Testing ShellScript... while true do echo "ShellScript Start Running..." ********************************** All My Shell Script Codes/Script/Commands ********************************** echo "ShellScript End Running..." exit 0 sleep 900 done Then Run this: sudo nano /etc/rc.local then add following and save. #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. sh ./ShellScript.sh & exit 0

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  • Gnome-Shell panel disappeared - How to get it back?

    - by Arindom
    I am on Gnome-Shell and using Ubuntu 11.10. The problem is after a recent update and also after installing a few extensions, when I logged in to Gnome Shell, I can't find the top panel or AWN. Only the wallpaper is showing and then Conky is displaying. It also seems to me that for some reason the display effects are not working and that is why AWN is not showing. Need your help to get back the panel.

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  • Run shell script using fabric and piping script text to shell's stdin

    - by Peter Lyons
    Is there a way to execute a multi-line shell script by piping it to the remote shell's standard input in fabric? Or must I always write it to the remote filesystem, then run it, then delete it? I like sending to stdin as it avoids the temporary file. If there's no fabric API (and it seems like there is not based on my research), presumably I can just use the ssh module directly. Basically I wish fabric.api.run was not limited to a 1-line command that gets passed to the shell as a command line argument, but instead would take a full multi-line script and write it to the remote shell's standard input.

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  • Open an Emacs buffer when a command tries to open an editor in shell-mode

    - by Chris Conway
    I like to use Emacs' shell mode, but it has a few deficiencies. One of those is that it's not smart enough to open a new buffer when a shell command tries to invoke an editor. For example with the environment variable VISUAL set to vim I get the following from svn propedit: $ svn propedit svn:externals . "svn-prop.tmp" 2L, 149C[1;1H ~ [4;1H~ [5;1H~ [6;1H~ [7;1H~ ... (It may be hard to tell from the representation, but it's a horrible, ugly mess.) With VISUAL set to "emacs -nw", I get $ svn propedit svn:externals . emacs: Terminal type "dumb" is not powerful enough to run Emacs. It lacks the ability to position the cursor. If that is not the actual type of terminal you have, use the Bourne shell command `TERM=... export TERM' (C-shell: `setenv TERM ...') to specify the correct type. It may be necessary to do `unset TERMINFO' (C-shell: `unsetenv TERMINFO') as well.svn: system('emacs -nw svn-prop.tmp') returned 256 (It works with VISUAL set to just emacs, but only from inside an Emacs X window, not inside a terminal session.) Is there a way to get shell mode to do the right thing here and open up a new buffer on behalf of the command line process?

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