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Top Forums UNIX for Beginners Questions & Answers Unable to execute the comand on the remote Linux hosts Post 303046020 by JackKerrnal on Tuesday 21st of April 2020 06:44:11 PM
Old 04-21-2020
Unable to execute the comand on the remote Linux hosts

I have multiple hosts ( More than 20) and need to execute the command but it is not working as expected.


1. This snippet of the code runs on multiple hosts and gives me the process id on the host where i am running .

Code:
      for hsts in `cat /a/b/c//hsts.txt`  # hsts.txt file contains all the hosts
         do
         ssh ${id}@${hsts} "cat /z/y/x|tail -1" | awk '{print $30}'
        done

2. I need to modify the above command where i need to see the process which is running based on the process id which i am getting from above snippet of the code.


The below snippet runs on individual hosts and it is displaying me the process but if i incorporate the above in the for loop it is not working . Appreciate your help

on this.
Code:
   ps -ef |grep `cat /z/y/x|tail -1 |awk '{print $30}'`

Moderator's Comments:
Mod Comment
Please use code tags to improve readability and follow the forum rules.

Last edited by Peasant; 04-22-2020 at 01:12 AM..
 

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on(1)							      General Commands Manual							     on(1)

NAME
on - execute command on remote host with environment similar to local SYNOPSIS
| host [command [argument] ... ] DESCRIPTION
executes a command on a remote host, using an environment similar to that of the invoking user where: host specifies the name of the host on which to execute the command. command specifies the command to execute on host If command is not specified, starts a shell on host. argument ... is a list of arguments for command. The user's environment variables are copied to the remote host, and the file system containing the user's current working directory is NFS mounted on the remote host (see nfs(7)). The command is executed on the remote host in the user's current working directory. Commands using relative path names that reference file system objects within the user's current working file system have the same behavior as running the command on the client. The behavior of commands using relative path names that cross the file system boundary or commands using absolute path names depends on the organization of the remote host's file system. Implicit and explicit use of environment variables may also cause a command's behavior to be dependent on the organization of the remote host's file system. For example, the environment variable usually contains absolute path names. Standard input, output and error of the remote command are connected to the appropriate file descriptors on the client. The remote execution daemon does not allow to execute a remote command. The signals and are propagated to the remote command. and are ignored by the remote command. All other signals are delivered to the com- mand. In order to execute a remote command, the remote host must be configured to execute (see rexd(1M)). Options recognizes the following options: Interactive mode. This option is required for commands that must communicate with a terminal such as or Terminal mode changes are propagated to the server. The standard input for an interactive command must be a tty device. The and options are mutually exclusive. Debug mode. Print diagnostic messages during startup of the command. These messages are useful for detecting configuration problems if the command to a specific host is failing. No input mode. This option causes the remote command to get end-of-file (EOF) when it reads from standard input, instead of connecting the standard input of the command to the standard input of the remote command. The option is required when running commands in the background. The and options are mutually exclusive. DIAGNOSTICS
The host name host was not found in the hosts database. The host host is down, unreachable on the network, or not running A problem occurred trying to find the user's current working directory (current_dir). A problem occurred trying to determine the mount point of the user's current working directory (current_dir). The standard input (stdin) of the command with the option is not a tty device. Errors that occur on the server server are propagated back to the client. These messages are documented in the DIAGNOSTICS section of rexd(1M). AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
exports(4), rexd(1M). on(1)
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