Ubuntu :: BASH: Execute Next Command Until Another Command Succeed?
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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Jun 20, 2009
I'm trying to start bash with a command and have it interactive like this:bash -i -c "echo Welcome!"As in, execute the command and allow me to use it as an interactive shell afterwards. (I'm doing something more complicated than echoing, but this doesn't work.)I've tried this from a running gnome-terminal, from one gnome-terminal to a new one withgnome-terminal and from the Alt+F2 program launcher (with "Run in terminal" ticked).
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Mar 24, 2011
I am trying to process a column separated data file, with a few bash command. For example, I have
Code:
file1 aaaa yes
file2 aaaa no
file3 bbbb yes
Let say I want to create new file with the output of first column and do something else with the output of 3rd column. Of course there are many ways to process this data file, but I wish to know by using awk, how could I do it. I'm trying:
Code:
awk '{system("touch $1")}' datafile
but the shell command will not able to get the awk '$1' output. How do I get this done ? And for another question, if the data file contains the variable name of a shell variable, how could I make use of it during a awk output ? For example I have a datafile1:
Code:
server1 yes
server2 no
And in another server declaration data file, I got this datafile2:
Code:
server1=xxx1
server2=yyy1
And in my awk script, I want to achieve something like (the syntax is definitely wrong, just to demonstrate what I assume it will like):
[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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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 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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Mar 29, 2010
I just recently learned about the wonderful little lpr command- and using man -t (bash command) to beautifully print man pages for reference- but is there a way to print both sides of the paper using a printer so equipped?
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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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Mar 20, 2011
Possible Duplicate: What does this cryptic bash command mean? Why this command crashes Linux? :(){ :|:& };:
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May 31, 2010
What's the command to delete bash command history?
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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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Mar 9, 2011
I am trying to grep multiple numbers from file, grep does have the -f option for that.
Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with
Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?
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Sep 14, 2010
I want to start my Ubuntu 10.04 and without logging in I need a command started. The command is setxkbmap .... So, I will not put the command in my .profile, nor in my .bashrc, because I am not going to login.
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Sep 14, 2010
I want to start my Ubuntu 10.04 and without logging in I need a command started. The command is setxkbmap .... So, I will not put the command in my .profile, nor in my .bashrc, because I am not going to login.
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Jul 26, 2010
I've just installed java (jre-6u21-linux-i586.bin) on Red Hat 4.4 AS and issued this command to check the java version: java -versionand got :bash :java: command not found
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Jun 5, 2011
I got a problem with terminal, since i'm really a noob with terminal i don't know how to fix it.Everytime i type in a command it shows for example:
-bash: ls: command not found
Even the basic commands don't work... just cd <directory> and those things works
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Nov 29, 2010
I create a bash script that writes another bash file. But in the generated bash file I want to write a bash command in the file and not executing it.Here's my bash file:
Code:
#!/bin/bash
cat > ~/generateGridmix2data.sh << END
[code]...
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May 13, 2010
I googled around and couldnt find what I was looking for. Maybe I used the wrong search terms, but whatever. I was wondering if there was a possibility to execute a series of terminal commands just by double-clicking an icon. For example, there would be an icon on my desktop, and if I were to doubleclick it, it would execute "cd ~/.wine2" and then "WINEPREFIX="$HOME/.wine2" wine program.exe".
I realise that most of you will probably go "duh, that's simple" or something similar, but I am extremely new to ubuntu, and dont know my way around yet.
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Feb 2, 2011
I need to execute this command after login: gvfs-mount -d /dev/sda1.It works perfectly from terminal but it doesn't if I add it to "Startup Applications" or to rc.local.Is there another way?
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Apr 29, 2011
I use two monitors,my problem is that I want to change the setup,so that the other monitor becomes default.There's no problem with my BIOS settings and I have tried every GUI tool that could help me(to my knowledge).Well I've found this URL...that helps a lot but I want to execute the command every time I boot before the splash screen(so that the login screen appears on the right monitor).I've tried rc.local but had no success.Any ideas on how to execute the command at boot time?
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Jun 13, 2011
i want to execute system command with perlm but it gives me error.
command is wmic client. here it is
#!/usr/bin/perl
open (EP, "/home/user/Templates/domainpc.log");
while (<EP>) {
chomp;
[Code]....
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Jul 12, 2011
kernel 2.6.21.5, slackware 12.0
GNU bash 3.1.17
Code:
As you can see, /usr/local/bin is in the path. However, bash does not look for nasm in /usr/local/bin.
If I am root, things go well:
Code:
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May 4, 2010
i have one executable file (filename : "tet"). i can run this command in other linux os like: "fedora, cent os" using command "./tet", and it's working fine. but this command not working in debian. i don't know how to execute this file.
1. i have tried with 755 and 777 permission
2. i have tried "home/fullpath/tet"
3. i have tried "/tet"
4. i have tried "./home/fullpath/tet"
but above all commands are failed. to run this execute file
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Nov 29, 2010
I would like to have an user that can execute al command with sudo.I configured sudo with yast2 and in the sudoers file actually there is a line with:USER ALL = (ALL) ALLWhere user is my username.But I can't use some command like ifconfig becouse it say that it can't find the command. I think that this is becouse of path, but shouldn't i get root path using sudo?
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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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Dec 25, 2010
I have linux as my host OS and windows as my guest OS on vmware. is there any possible way to execute linux commands from windows the guest OS? for example create new files, view files, ssh, check processes running... etc.
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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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