The Linux kernel support pseudo-terminal master and slave (also known as Unix98 pty naming) using using the devpts file system, that should be mounted on /dev/pts. You can mount the devpts using any one of the following method:
 Use mount comamnd
 Use /etc/fstab file.
mount command syntax
The syntax is (must type as root user):
mount -t devpts devpts /dev/pts
Edit /etc/fstab, enter:
# vi /etc/fstab
Append the following line:
devpts /dev/pts devpts gid=5,mode=620 0 0
Save and close the file. Reboot the server / machine.
How do I verify that the devpts is mounted under Linux?
Type the following command:
$ grep --color devpts /proc/mounts
$ mount | grep --color devpts