SSH - Remote executing program from host failed?

Question

I need to run this command from Ubuntu machine: ssh user@hostip "which mvn" to show excutable path of Maven , but it show nothing

root@~: ssh user@hostip "which mvn"
root@~:

I check command which mvn on remote host it show me :

root@~: which mvn
/usr/share/mvn
root@~:

I try to sourcing .bashrc when excute ssh command but no luck:

root@~: ssh user@hostip ". ~/.bashrc;which mvn"
root@~:

In ./bashrc also have nothing about maven PATH configure

So , what i have to do ?

Answer 1

root@~: ssh user@hostip "which mvn"

When you run ssh and specify a command to invoke on the remote system, ssh by default doesn't allocate a PTY (pseudo-TTY) for the remote session. Shells like bash will detect that they're running without a TTY, and this will alter how the shell process initializes itself.

In your case, whatever command adds "/usr/share" to your remote PATH is probably not running for non-interactive sessions (sessions without a TTY). You can probably solve this by telling ssh to request a TTY for the remote session:

ssh -tt user@hostip "which mvn"

The -t option tells ssh to request a TTY for the remote session. This would cause your remote shell instance to initialize itself for an interactive session. Refer to the ssh manual for details on the -t option.

If this doesn't solve the problem, you will need to find the point in your shell configuration files on the remote server (.bash_profile, .bashrc, etc.) where /usr/share is being added to your PATH, and make sure that step is performed for non-interactive sessions.