General :: Only Execute 2nd Command On Successufl Execution Of 1st Command?
Aug 19, 2009
I have a script which builds a project and then runs junit tests. However, if the build fails, the junit tests fail with the same error message.Therefore the command which runs the junit tests should only be executed if the build was successful.
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Jun 7, 2010
Bash's command history is great, especially it is useful when adding the history -a command to the COMMAND_PROMPT.However, I'm wondering if there is a way to log the commands to a file as soon as the Return key is pressed, e.g. before starting the command and not on completion of the command (using the COMMAND_PROMPT option would save the command once the prompt is there again).
I read about auditing programs like snoopy and session recorder like script but I thought they're already too complex for the simple question I have. I guess that deactivating that script logs all the output of the command would lead already in the right direction but isn't there a quicker way to solve that probelm?
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May 9, 2011
Up until now I've been using plink to remotely compile a project I'm working on. But recently the administrator from the remote server updated the distribution and messed up some configurations. My project has a lot of scripts written for tc shell (tcsh), and now the default shell is bash. There is no way to change this. Another problem is that now I need to run newgrp to change my default user group.
So... to work around this problem I've changed my .bashrc to run newgrp and then tcsh. If I do a normal connection using SSH, everything works as expected, but when using plink, or SSH to remotely execute commands, the shell gets stuck on the newgrp command. I think it's because both applications need a return value from newgrp to send the command I need to execute. Remotely running scripts that call a shell also get stuck like newgrp (newgrp also opens a new shell and that's why it gets stuck) my .bashrc is as follows:
Code:
user_grp=`id -g`
if [ $user_grp != 4919 ]; then
newgrp new_group_id
else
[code]....
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Dec 1, 2008
Is there a way to execute some command and then after the command completes utomatically reboot the system and then after the system reboots execute another command ? For example look at the sequence shown below(1) Execute command-1(2) After the command-1 in (1) is completed,reboot the system (3) Execute command-2(4) After execution of command-2 reboot the sytemIs there a way i can automate this process so that i need not reboot the system manually
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Oct 13, 2010
I have seen command like $rm aa dd cc bb ee then something like $ >> zz // it removes zz also Where aa dd cc bb ee zz are the files in my directory. Do not know exactly.
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Jun 18, 2010
Code: cmd='date | wc'
$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?
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Aug 13, 2009
I want to use ssh to execute a command and to wait endlessly to log everything (in file) that comes as a stream of the connected server. But unfortunately, in the manual its written "If command is specified, it is executed on the remote host instead of a login shell"
So what happens is that when I specify my command:
ssh user@server "my_command"
It executed the command and the flow of execution returns to bash shell. So basically my session ends right after the command is executed. This happens only in case I specify command in the command line. If I login into ssh manually and then type "my_command", then the session doesn't end. I want the ssh not to exit, because after "my_command" executes, I want to capture everything in the session.
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Mar 19, 2010
I have a big bash script ,its goal is to download movie one by one . But I often get into a problem: if this script is executed in cron,it often does not completely download the movie.I often find the movies it downloaded are several KB while the movie is actually 20MB.So I think it is because it did not wait for finishing one task ,and jump to download another.So I want to know ,is there a way to force the bash script to wait until one movie downloaded completely and then start to download another movie ?
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Aug 27, 2010
I want a quick and simple way to execute a command whenever a file changes. I want something very simple, something I will leave running on a terminal and close it whenever I'm finished working with that file. Currently, I'm using this: while read; do ./myfile.py ; done And then I need to go to that terminal and press Enter, whenever I save that file on my editor. What I want is something like this: while sleep_until_file_has_changed myfile.py ; do ./myfile.py ; done
Or any other solution as easy as that. BTW: I'm using Vim, and I know I can add an autocommand to run something on BufWrite, but this is not the kind of solution I want now. Update: I want something simple, discardable if possible. What's more, I want something to run in a terminal because I want to see the program output (I want to see error messages).
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Oct 3, 2010
How do I set up SSH so I don't have to type my password? i execute the following command ssh -l admin hostname command but each time i execute it, it ask me to enter password.how i can give it password as default because i'm going to put in bash file ?
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May 4, 2011
I am working in a CentOS environment with numerous CentOS machines. Currently there are multiple developers that each have their own login/home directory and then for various admin tasks we all share a single super user account.
The problem
I have a number of aliases, variables, functions, and settings that exist in my personal login's .bash_profile. None of these are available in the shared super user's .bash_profile. My current work around is that everytime I sudo in as the super user and I re-execute my .bash_profile from my personal user's home directory. I am not allowed to edit the init stuff for the super user
The Question
Is there any way I can automate my sudo sequence such that it will execute my personal .bash_profile after I've executed sudo without requiring me to edit the super user's bash init stuff?
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Jun 30, 2011
When i click in one icon (for example), this icon executes "java -jar ...". In another words: Make a .exe on linux.
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Jul 29, 2010
Top: error while loading shared libraries: libproc.so.2.0.6: cannot open shared object. I am not able to execute top and ps command.
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Jan 6, 2010
Is there a way to execute top command once and exit...i.e. stop refreshing window and continue console without pressing 'q' or 'ctrl+c'...
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Mar 25, 2010
My problem is:
sub init() {
$Test->description("Establishing the connection to the client");
eval {
$Host = host($CLIENT) or die($@);
$Conn = connect("#ssh") or die "Client connection Failed" . $@;
};
if ($@) {
$Log->error("Unable to instantiate the Objects for the Test" .
[Code]...
Here I'm trying to connect windows machine using connect object which is working fine. But when I tried to execute the command on Windows machine from Linux machine by using:
[Code]...
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Jun 15, 2011
I am having trouble getting the while loop to execute in the ssh command:ssh $USERID@serverX "while read line do echo $line done<$list_dir/cost_feed.lst.old"Error:bash: -c: line 1: syntax error: unexpected end of fileI have managed to use simpler commands with ssh like:ssh $USERID@serverX "pwd; cp x y"I expect that I need to add some combination of escape characters or semicolons
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May 20, 2010
My laptop has a dead battery. Even when it's fully charged, if the power cable is pulled out it only lasts for about 4 minutes before it dies. I'm running Ubuntu Lucid Lynx 32-Bit. What I want to do is create some sort of script or program that will immediately set my computer to go into hibernation once it detects that the power cable has gone dead. I'm willing to look into all ways of doing this. I can program in C, but I'm not familiar with the API used to manage Power Management in Linux.
[Code]...
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Jan 24, 2010
On my ubuntu I have a command pm-suspend, which puts the computer to sleep. It has to be run with sudo. Since it is inconvenient to be forced to type the password every time I want my computer to sleep, I thought maybe there's a way around it. Naively I thought that if I'd create a script as root, that invokes pm-suspend, and then let anyone execute that script, I could run that script as my own user and then that script would be considered run by root and hence be allowed to run pm-suspend. Obviously that didn't work. The root-check procedure in pm-suspend still found out that the original executor was someone different from root.
Still I think something similar (although slightly more elaborate) should work.I'm thinking about the process that allows the user to mount hard drives for example. Normally root is required, but it is somehow bypassed by the gnome utility mounting.
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Apr 14, 2011
How can I give execute permission to chmod command from run level 3.Because in GUI mode we have the execute option in the properties of file. E.g. I gave following command
chmod -x chomod
After that I want to give the execute permission (x) to chmod command again but how from command prompt?
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Apr 23, 2010
within my bobje directory, I have many directories and some log files . I want to delete those log files without traversing the subdirectories. so i performed these commands and getting the mentioned errors.
[Code]....
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Jan 8, 2010
Problem started after installing a new firewall in my network. originally after installing the firewall there would be a 10 second delay after entering a command before it was processed, the command would be executed however there would be an error, i forget what it said, something about not being able to resolve my domain name (and it would give my domain name). i realized this was a problem with my NAT, so i configured DNS forwarding on my firewall so that any attempt to access my server using my domain name from inside the network would point back at my server. after setting up the DNS forwarding i no longer receive the error about my domain name being unreachable, however there is approximately a 30s delay between entering a command and its execution.
the problem is hardly critical i do not see any more serious problems, it is just a pain to do any work when every time i try to do something i have to wait for it to execute.
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Mar 14, 2011
How do I create a command to launch a program and then have the terminal wait for a specified time and then move on to the next command?I'm wanting to create a startup script, and I need program B to wait until program A has finished loading up.
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Jun 14, 2010
I have the following command:
Code:
(systool -c fc_host -v && systool -c fc_remote_ports -v) | grep -E '+Class Device path = "/sys/class/fc_host/host[0-9]+"$|+node_name.*= "0x[0-9a-f]{16}"$|+Class Device path = "/sys/class/fc_remote_ports/rport-[0-9]+:[0-9]+-[0-9]+"' | sed -e 's#.*host([0-9]*).*"#scsi-qla1-adapter-node=#' -e 's#.*rport-([0-9]*):[0-9]*-([0-9]*).*#scsi-qla1-target-2=#' -e '$!N;s#
##' -e 's#=.*node_name.*= "0x#=#g' -e 's#"$#;#g' | sort
and I want it to execute via ssh on a remote machine through a script. Therefor I need to escape it properly. Because of the massive use of regular expressions and commandline options, this is not an easy task. Is there any (online) utility that will escape that for bash use? I suppose pasting the code in vi and doing some search and replaces should do the trick. But for that I would need a list of characters to escape...
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Jul 13, 2011
Is possible (by root of course) to run a command from console, that will be executed on X-session owned by another user on the same linux box/machine ? Example: Can root open xclock for another local user logged into X11 ?
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Apr 12, 2010
I'm not quite sure what's up with this, but when I change the title of a terminal away from the default (e.g. to represent which project that terminal is to be used for), it changes back to the default (user@host:path), but only on the task bar at the bottom of the screen, listing the open windows.
If I change tabs in the terminal and then change back, it displays again at the bottom of the screen, but as soon as I execute another command (e.g. ls), then it resets again. That's quite annoying, as I like to have a few terminals open, each with a set of tabs pertaining to a particular project. The fact that I can't see from the title on the taskbar which is which means I have to guess/remember/check them all...
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Jun 21, 2010
I have a script:
Quote:
# Call mail script to send an email
if [ -f /tmp/report.txt ]; then
/usr/local/scripts/mail.pl
sleep 10
rm /tmp/report.txt
else
exit
fi
What I need to do is, I want to check if file exists, if file exists call other script (mail.pl) and then delete the file (assuming mail.pl script executed). If file not exists just exit out of the script. I'm not sure how I can see that other script execution completed or not before I delete the file even though I put sleep command. And also it seems like its not that good, even though it is working. I wanted to see if we can write in more efficient way.
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May 3, 2010
Is it possible to allow a group/user to execute a command, where one of the parameters of the command is a group as well? example that does not work as intended:
Code:
Cmnd_alias SU=/bin/su -l %group1 This example works sortof, it treats the "%group1" literally. I know I can list out the "/bin/su -l <eachuser>", but as you can imagine that is impractical. In this example, I want people in group2(not shown for brevity sake) to be able to su to someone in group1
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Aug 8, 2011
I am working at a client who has a project where code is a mixture of different source control systems. So a layout might be like this
project/a/.svn
/a/subfolder/.svn
/b/.hg
/c/subproject/.svn
/d/.hg
So I am trying to put together a simple command that when executed from the project folder will run the appropriate hg/svn command in each project i.e:
[Code]...
Since the client has many such projects, Instead I am looking for a solution similar to find -exec where the svn/hg commands are automatically executed on each first level of match (i.e. svn up is run in the project/a folder but not in project/a/subfolder). How can such a command be constructed ?.
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Jun 23, 2010
I just want to know that how can I execute my scripts (example.sh) files like other normal commands from command-line. Please describe the full method
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Jan 5, 2011
I am trying to setup a system to allow normal users to execute a command without using sudo. Is this possible?
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