Check Disk Name, Size and FreeSpace of remote Linux Machine
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ssh 10.37.54.166 'df -h / | cat' 2>&1
But, while executing it, this expects same OS user should be available on remote as I have logged on current machine.
Second thing it is asking for password, which i want to input as command argument.
df -h / | cat
You don't need the cat. It doesn't do anything in this situation.
Remember that when running the command ssh without a user set and a command, it will login into the ip address as your current user, then run the command. You must have shell access to run a shell command. You can change the user set by typing ssh username@host rather then just ssh host. You can also set the config in ~/.ssh/config to set hostnames that login with a preset user. A example config to login to Server1 as user admin to ip address 10.37.54.166:
While technically feasible to input a password into ssh when asking for a password, using public keys is significantly more safer and much better practice.