SOLVED
Scenario: I am a beginner in bash script, windows task scheduler and such. I am able to run a local bash script in my Windows Task Scheduler successfully.
Problem: I need to do this on many computers, thus I think storing just 1 copy of the bash script on a remote server may be of help. What my Task Scheduler needs to do is just to run the script and output a log. However, I can't get the correct syntax for the argument.
The below is what I have currently:
Program/Script: C:\cygwin64\bin\bash.exe
Argument (works successfully):
-l -c "ssh -p 222 ME#ME.com "httpdocs/bashscript.sh" >> /cygdrive/c/Users/ME/Desktop/`date +%Y%m%d`.log 2>&1"
Start in: C:\cygwin64\bin
Also had to make sure that the user account under Properties in Task Scheduler is correct, as mine was incorrect before. And need key authentication for ME#ME.com too.
For the password issue, you really should use ssh keys. I think your command would simply be ssh -p 222 ME#ME.com:.... I.e., just get rid of the --rsh stuff. – chrisaycock
Related
I have a bash script lets say test.sh. This script contains the following:
#!/bin/bash
echo "khaled"
ads2 svcd&
This script simply prints my name (just for test purposes) and execute ads-service application in the background. When i run the script on my ubuntu, it works correctly. As a test i checked which programs run on the kernel
As you see. ads2 runs and has 12319 process-id.
Now what I'm trying to do is to run the script on the ubuntu, however remotely from a windows pc.
Therefore i opened command-line on windows and executed the following command:
ssh nvidia#ubuntu ip-address ~/test.sh
And i get the following
As you see the scripts run and prints khaled,however on windows command line and what i want is that the script is executed on the ubuntu. this justify why the lineads2 svcd& doe not do anything, neither on windows (which makes sense, since ads2 is installed on ubuntu) nor on linux.
So how can i execute the script on ubuntu ?
thanks in advance
Use the full path to start ads2. When using remote SSH your environment variables may be different than in a local shell.
#!/bin/bash
echo "khaled"
/home/nvidia/ads2 svcd&
Not sure where ads2 is located.
Try the following to locate it on your Ubuntu local shell.
command -v ads2
You may also need nohup to persist the process beyond the life of the SSH session.
If you have the script on the remote server and you want to run this, you would add back ticks,
ssh user#server './test/file.sh'
The script's output would be sent to your local machine, as if you ran the command from your local machine.
One of my tasks at work is to check the health/status of multiple Linux servers everyday. I'm thinking of a way to automate this task (without having to login to each server everyday). I'm a newbie system admin by the way. Initially, my idea was to setup a cron job that would run scripts and email the output. Unfortunately, it's not possible to send mail from the servers as of the moment.
I was thinking of running the command in parallel, but I don't know how. For example, how can I see output of df -h without logging in to servers one by one.
You can run ssh with the -t flag to open a ssh session, run a command and then close the session. But to get this fully automated you should automate the login process to every server so that you don't need to type the password for every server.
So to run df -hon a remote server and then close the session you would run ssh -t root#server.com "df -h". Then you can process that output however you want.
One way of automating this could be to write a bash script that runs this command for every server and process the output to check the health of the server.
For further information about the -t flag or how you can automate the login process for ssh.
https://www.novell.com/coolsolutions/tip/16747.html
https://serverfault.com/questions/241588/how-to-automate-ssh-login-with-password
You can use ssh tunnels or just simply ssh for this purpose. With ssh tunnel you can redirect the outputs to your machine, or as an alternative, you can run the ssh with the remote commands on your machine then get the ouput on your machine too.
Please check the following pages for further reading:
http://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote-port-forwarding-explained-with-examples.html
https://www.google.hu/amp/s/www.cyberciti.biz/faq/unix-linux-execute-command-using-ssh/amp/
If you want to avoid manual login, use ssh keys.
Create a file /etc/sxx/hosts
populate like so:
[grp_ips]
1.1.1.1
2.2.2.2
3.3.3.3
share ssh key on all machines.
Install sxx from package:
https://github.com/ericcurtin/sxx/releases
Then run command like so:
sxx username#grp_ips "whatever bash command"
What is the best and secure way for a terminal to ping a server for a list of commands to execute every 60 secs? For example, it could download a file (that houses the command) or query a database and then execute what is on there.
Are there more efficient/secure ways to accomplish the above?
Thanks
If you want to make it into a script:
commands.ssh
echo "This will run on the remote machine."
# Do a backup or something...
Then you can execute pass this file to the remote machine using:
ssh user#remote -i id_rsa < commands.ssh
I recommend using an sshkey so that you don't have to keep your login information in the commands file.
Note: make sure the permissions for the commands.ssh file are secure!
chmod 600 commands.ssh
You can use SSH connections which are SSL enabled. If commands are predefined you can depend on a cron job, then you don't need to login to terminal again and again to run it.
i wanted to execute commands on remote linux box from windows and also wanted to collect result of executed command. Basically i have to pass 2 boxes to execute that command here is flow.
Login to a box
ssh to another box
run command
collect output of command locally (in file)
I tried following
F:\xyz>plink xyz#a1.b1.com -i F:\x\y\PRIVATEKEY.ppk -pw xyz
ssh -f root#166.1.8.1 yum upgrade Cyberc
but this is asking for password. I can do it by adding id_rsa.pub value in to authorized_keys but we dont have permission to do. So instead of that i wanted to write EXPECT script to pass user/pass and commands to complete my job.
Any help on EXPECT script would be much appreciated.
Unless the program on the remote linux host is interactive (i.e. it has prompts that the user must respond to), then you probably don't need to use expect - you can simply use plink to connect to the remote Linux host from your windows machine and run the command. You can specify the username and password to authenticate with the remote host in the plink command. See the following links for more info:
http://the.earth.li/~sgtatham/putty/0.58/htmldoc/Chapter7.html
http://stackoverflow.com/questions/12844944/login-syntax-for-plink-using-ip-username-and-password
Ok I'm about to pull my hair out. I have a perl script that just will not run in the crontab however I have a previously written perl script that runs just fine every day on the same box. I have checked all of the given solutions on this site and others around the web and nothing seems to make a difference. Here is my cron and the first part of my script
55 13 * * * su oracle; cd /u02/oraclebackup;./move_em_bkup.pl >> /u02/oraclebackup/move_em_backup.log > move_em_bkup.dbg 2>$1
It touches the .dbg file but does not put anything in there. There are no errors or anything that I can use to go by.
#!/usr/bin/perl
use Strict;
use Archive::Tar;
use Net::SCP qw/ scp /;
use Net::SCP::Expect;
use DateTime;
Can anybody help?
The command you're running is:
su oracle; cd /u02/oraclebackup; ...
su oracle normally launches an interactive shell under the oracle account (assuming you have permission to do so). I'm not sure what that would do in a non-interactive cron environment, but even assuming it works, the cd /u02/oraclebackup and following sub-commands will be executed after that shell terminates, i.e., under the account that owns the crontab. The su oracle will either block the rest of the command or do nothing.
You can use su -c command to run a command as a specified user. In you case, you'd want something like:
su -c oracle sh -c 'cd /u02/oraclebackup; ...'
Or change su to su - if you need the oracle account's login environment.
Better yet, drop the su and put the whole thing in the oracle account's crontab. You might still need to play some more tricks to get the environment right; cron jobs run with a limited set of environment variables by default.