What are the exit statuses of ssh command?

What are the exit statuses of ssh command on a Linux or Unix like system when you run ‘ssh host command‘?

[donotprint][/donotprint]SSH client is a program for logging into a remote machine and for executing commands on a remote machine. By default in Linux/UNIX if particular command/shell script is executed, it return two type of values which is used to see whether command or shell script executed is successful or not. This value is know as Exit Status of shell command or script.

The session terminates when the command or shell on the remote machine exits and all X11 and TCP/IP connections have been closed. The exit status of the remote program is returned as the exit status of ssh. You can use bash shell $? Variable to print exit status of shell. For example:
[email protected]: $ ssh [email protected]

Password:
[email protected]: $  exit
[email protected]: $ echo $?

In short,

  1. ssh exits with the exit status of the remote command which can be find with echo $? command.
  2. Or value 255 is return, if an error occurred while processing request via ssh session

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.