mkdir -p over SSH bash

Question

I have a small test script as follows;

TESTDIR="$HOSTNAME"
ssh [email protected] "\$TESTDIR"
mkdir -p ~/$TESTDIR/test
exit

the output with bash -x is;

+ TESTDIR=ndx
+ ssh [email protected] '$TESTDIR'
+ mkdir -p /home/user/ndx/test
+ exit

Yet on the remote server, no directory exists?

Solution 1

The last argument of ssh is command you want to execute on the remote host:

TESTDIR="$HOSTNAME"
ssh [email protected] "mkdir -p ~/$TESTDIR/test"

Solution 2

If you have a pem file to ssh as authentication use the following

ssh -i your-key.pem user@ip_addr "mkdir -p /your_dir_name/test"