Add user as sudoer

1. Open Unix Server

2. Login as root (sudo su)
Type command:

# setenv EDITOR ee
# visudo

3. Add within this line to add new sudoer:
## User privilege specification
root ALL=(ALL) ALL
hassan ALL=(ALL) ALL

Press ESC to save & exit.
Done.

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OR

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Set sudoer permission in admin group:

# nano /etc/group

Change/Add admin
*admin: name1, name2, name3

Ctrl X > Y > Enter

Done.. :)