General :: Bash Script Works In Terminal But Not In Cron?
Feb 17, 2011
I'm really running into a wall trying to figure this out. I have a Bash script and narrowed down the one command that doesn't seem to work via cron and it's my pgp decrypting line. Works fine if I run the command via terminal but if I run it via cron it doesn't output anything.crontab -e shows the cronjob and it runs, creates the log file with no output. Is there maybe something I need to run as well? Permissions look set, unless the cron is running as a different user(was under the assumption if it showed up under crontab while logged into that user, then it would run as that user.
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Sep 24, 2010
I have a script that pops up a jpg file several times a day as a reminder. The script is called up by crontab and it works perfectly.The issue is that I want the script to also perform a system "beep" in addition to popping up the jpg file. When I test it on the command line everything works but when I run it in cron the jpg file pops up but the beep doesn't beep. I'm thinking the problem is in the "echo -e \a" part. I must be missing something.Here is my script:
#!/bin/bash
echo -e \a
sleep01; echo -e \a
[code]....
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Jul 1, 2011
I am frustrated by running a script on the Fedora 14 computer as a cron job. I paste the code:
Code:
#!/bin/bash
#a backup script to copy data from sda to sdc
ROOTVOL=`blkid -U ea210a08-6212-4dc8-be1c-23fce3b965bc`
[code]....
So when I run this as root, for example:
Code:
# /root/myscript
the result is what I expect:
Code:
Jul 1 13:41:16 svn root: ADMIN: Executing backup-svn
Jul 1 13:41:16 svn root: using blkid ea210a08-6212-4dc8-be1c-23fce3b965bc as /dev/mapper/vg_svn_backup-lv_root
[code]....
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Jul 25, 2011
I have the following bash script...
Code:
#!/bin/bash
#Set filename for links
FILE=/home/andrew/scripts/links.txt
#pkill chrome
pkill firefox
[Code]...
When run it compares the public ip address against a file (ipAddress.txt) to basically determine if I am on my VPN or not. If I am not, i.e. it finds my public ip in the ipAddress.txt file it is supposed to exit otherwise it launches firefox with the given URL.
I have tested this by running from cmd line and running from the crontab. Running from the cmd line I can start the script, let it launch the first URL, then i disconnect from the VPN and the next time it goes through the loop it detects that my VPN has disconnected and kills the script. However, from the cron job if I have disconnected from the vpn I have found that it even though it finds my public ip address within the ipAddress.txt file it still marches right through to the next step in the script and launces the browser and will do this over and over.
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Aug 21, 2010
I don't quite understand how pipes work in bash. I know that it takes an output from one command as the input in another command. What an output is I can get because it's what the command prints out to the screen. But how do I know what input a command will take? Here is an example I thought would work:
Which gem | rm
Unfortunately it didn't.
Which gem prints out "/usr/bin/gem" so that must be the output right? I thought that was given to rm so it would be "rm /usr/bin/gem" but I was wrong. How do I know what input a command takes?
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Oct 8, 2010
I have a PGP script that for whatever reason if I let linux's cron run it automatically, it sends out the final email with attachment with a blank file. If I come in and run in manually everything works fine and the file is populated in the file. So the only real difference is that i'm running it manually through cron, rather than letting cron run it at a set time.Below is a sumary of my script.
Code:
#! /bin/bash
#PGP Decryption Bash Script
[code]...
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Aug 28, 2010
I've made a bash script to do scp a file from another server and tested it successfully by executing it manually. However, when I scheduled it by cron, I received a mail from root saying permission denied.
The script is at:
It's supposed to secure copy a file from a remote host to:
The script's content is (No need to supply password as I've done the ssh-keygen thing):
Code:
From what I can make out of the mail, it appears that it has problem saving it to the /home/backup directory.
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Mar 18, 2010
Im used to using nautilus within centos but have recently just got a VPS and quickly realising that using a KDE is unacceptable in this environment. Although I do find it so much quicker doing things like folder permissions in KDE rather than typing it all out in the terminal? Everyone I speak to says, use the terminal and I should learn this way as opposed to using the KDE, but theres certain things I just dont get
How is it possible to make quick changes to scripts and viewing them in a browser etc , without a mouse or using KDE? and only using a terminal?? I am wondering how to develop websites just using the terminal?
How can it be quicker to type out/view permissions etc in the terminal when its instant and just a few clicks in the KDE?
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Jun 5, 2010
I have a very simple gawk script to add commas to numbers to make them more readable:
It works perfectly from the command line, but when run from cron it doesn't add the commas.
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Jun 23, 2011
I want to be able to time how long I spend in front of a terminal. I'm thinking the best way will be to have some sort of timer that starts and stops when the terminal gains/loses focus. And it will have to work with multiple terminals...
I'm using GNOME.
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Sep 10, 2010
I open up 2 xterms on my desktop, A(/dev/pts/0) and B(/dev/pts/1).I can write from A to B using redirection e.g. echo "test" > /dev/pts/1How do I run a command from A on B? e.g. "clear"Basically I'm putting the 2 terminals side by side, and using terminal B to display the contents of the current working directory, by running the following in A:export PROMPT_COMMAND="ls -a > /dev/pts/1"but this fills up the screen pretty fast. I was actually looking for a way to clear up the second terminal.
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Mar 25, 2010
I have an rsync script I wrote that I have tested and it works perfectly when I run it manually. Now I am working on a server setup script and I have gotten my setup script to create the rsync script in /etc/cron.hourly and restart crond. To spite the fact that the script is in /etc/cron.hourly and I have restarted crond, the script does not run. With that said, how can I script adding the rsync script to run hourly as a cron job?
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Feb 29, 2016
I mainly use debian jessie , recently i have installed daragora as my second os to get a feel of gnu/linux . the problem is that dragora uses bash , and it's commands are different from debian jessie terminal is there a way that i can use the same commands here in dragora?
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Dec 10, 2010
Linux-goers. I did some research on this, but I am still fairly new to Linux. In Ubuntu 10.10 (Maverick), I accidentally overwrote my "/bin/bash" file. Dude, using "sudo" with a small typo can work disasters. Bash is now broken in the Terminal (gnome-terminal). Terminal itself still works fine, technically, but bash is still hosed/broken. Here is what I did to try to fix it: Booted from Ubuntu 10.10 live CD. Mounted my Ubuntu partition and manually copied the good/fresh "bash" file onto my hard drive. Verified copy was successful. Didn't help, as you see. Reinstalled "gnome-terminal" using synaptic package manager. Tried to reinstall bash via synaptic, it failed with error, "E: /var/cache/apt/archives/bash_4.1-2ubuntu4_i386.deb: subprocess new pre-removal script returned error exit status 2"
In Terminal, all basic commands work as far as I can tell. ("ls", "pwd", navigation, etc.) Here are some problems:My "username@computername" does not display in the prompt; only the $ sign. Bash keyboard shortcuts such as uparrow and tab do not work. Instead, each inserts a key code. I can't even move the cursor left/right. Aliases (a function of bash and .bashrc) are broken, of course. My sanity level decreases when I use Terminal now. For what it's worth, even with "sudo" I get a "permission denied" error when trying to run Google Chrome! I read something about a ".bashrc" file being a possible problem, but I don't know how to make it work, or the file's proper locations in Ubuntu 10.10. Is there something I can do with a "make" or "apt-get install" command or something?? Could this simply be a permissions problem? Is the link to "/bin/bash", "/bin/sh", or a ".bashrc" file broken? Guide me, oh Linux gurus.
P.S. I always wondered what exactly bash was and how it was different from the basic terminal. LoL, this is an excellent way to demonstrate the difference, and I WANT IT BACK!
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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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Feb 27, 2011
Is there a way to get colored output when using tab completion in a terminal? My colors are fine everywhere else so I know that I've enabled a color terminal successfully. Using bash in Ubuntu (10.10).
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Sep 12, 2011
Is there a way to catch or stop a Linux shut down after a reboot, halt or shutdown command has been entered?sudo shutdown -r +10 I should now have 10 minutes before the computer shuts down. If I change my mind and decide that I still want to continue running, how could I stop the shut down?
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Jan 19, 2010
This code:
Code:
#! /bin/bash
echo Okay.
echo
Does not do it....
P.S. I want to show my parents what happens when I do:
Code:
sudo make me a sandwich
and have it say "Okay."
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May 11, 2011
My terminal is showing bash-2.3-$ instead of Username@computename.
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Feb 19, 2010
I've got a bash script that uses rsync via SSH to back up data from a remote webserver.
This script works fine when I run it myself but when it runs as a cron job I get the following error:
Code:
2010/02/20 08:15:01 [6786] Unexpected remote arg: user@www.server.com:~/www
2010/02/20 08:15:01 [6786] rsync error: syntax or usage error (code 1) at main.c(1219)
[code]....
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Oct 26, 2010
I know how to redirect the output of a terminal to a file. For example, if I want to list all the files in ~/Documents and output to a file called test.txt, I would do this: ls ~/Documents > test.txt The question is, can I copy the output to test.txt AFTER I have carried out the command? This would mean that I wouldn't have to know in advance whether I want to copy the output to file. I want to do something like this: ls ~/Documents Then this: <bash command for copying standard output to test.txt>
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Jan 2, 2011
How to select text in BASH terminal using the keyboard without mouse? I'm using Ubuntu 10.10
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Jun 25, 2011
I want to be able to synchronise files between 2 remote computers in both directions. Say for example that I want to synchronize my /home/Documents directory with <username>@example.com:/home/Documents What's the easiest way to update the folders in both directions, so that new/updated files on my home computer get transferred to the remote computer, and new/updated files on the remote computer get transferred to my home computer?
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Jan 12, 2010
i want to delete some say 10 previous commands in bash shell!
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Nov 13, 2010
Code:
#!/bin/sh
chown -Rc steven:users "/home/steven"
I have more lines in the script but each line does the same error. This is run in a cron job but it always returns.
Code:
chown: cannot access `/home/steven
': No such file or directory
But it is a valid directory I have even tried adding an / and even a space on the end and still same error.
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May 4, 2011
I have a personal server and a dynamic IP address, so I wrote a script to check the currently assigned IP address and compare it to the one stored in a file from the last check, and visit the update URL if it's different.
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Jan 8, 2009
I have a script that that is supposed to send me an e-mail when a host is not responding to ping:
The script works fine when I execute it directly but when cron executes it, the ping error is never picked up by the script so the if statement is ignored.
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Mar 13, 2011
$ execute_some_long_command <command is executing> <Accidently press middle button that inserts bunch of garbage (including, for example, `rm -Rf ~/*`) into console>
How to let execute_some_long_command finish, but not execute inserted things?
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Mar 18, 2010
Script programming question for the experts. I have written a bash script that works fine if I execute from the shell interactively. However, once I schedule it to be executed via cron, it just wouldn't work. I believe this has to do with cron running in a different environment than the one I am in when I putty in.
The bash shell script does refer to environment variables in the .cshrc file. I guess these aren't available to the cron? How can I load them into the script if I want them to be available to the cron locally within the script?
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Apr 20, 2011
I have script which does file locking via flock and then writing it's pid into that file. It perfectly works being run by hand in terminal, running under cron on Debian, but somehow fails being run under cron on Centos 5.6. Script part and straced outputs are below.
bash code:
#setting lock
mylog "setting lockfile $LOCKFILE"
exec 200<> $LOCKFILE
[code]....
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