Create-Special-User-on-Ubuntu

Create a User WithOut Login through GUI
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User "-r" Option with useradd command

# useradd -s /bin/bash -G sudo -m -r svk
# passwd svk
# su - svk

# mkdir /usr/svk
# chown -R svk: /usr/svk

Create some special Command for that user to Run
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$ cat .profile
...
# set PATH so it includes user's private bin directories
PATH="/usr/svk:$HOME/bin:$HOME/.local/bin:$PATH"
$

$ cat /usr/svk/psql-aws
#!/bin/bash
if [ -z $1 ]; then
    psql -U svk -h odoo-pgsql-xxxxxxxxxx.rds.amazonaws.com
else
    psql -U svk -h odoo-pgsql-xxxxxxxxxx.rds.amazonaws.com -c $1
fi
$
$ chmod +x /usr/svk/psql-aws