su (switching to other user)

bjagadeesh · #1 (**permalink**) 05-20-2008

Hi,

what is the use of the double quotes and !! in the following code segment:

su - user1 << ""!! > /dev/null 2>&1
echo "welcome user1"
EOF
!!

also what is the difference between below:

su - user1 << ""!! > /dev/null 2>&1 and
su - $USER << ""!!!> /dev/null 2>&1.

Note: $USER = user2

Jagadeesh.

psiva_arul · #2 (**permalink**) 05-20-2008

Hi,
in UNIX su command used for change the one user account to asnother user account.

in your code change the user1 account into other user account that code will ask the new user login detials and print the new user login details

Regards,
MPS
Bangalore

Yogesh Sawant · #3 (**permalink**) 05-21-2008

duplicate post, proceed here

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