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i edited /etc/sudoers using visudo command so as to grant user sudo privilege without password as following :

userName ALL=(ALL:ALL) NOPASSWD:ALL

but it didn't work for me ,

any suggestions Thanks in advance

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Did you use visudo to edit the file. Are you sure your config is valid? – Zoredache Dec 19 '11 at 2:37
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What does the output of sudo -l look like while logged in as userName? – Kyle Smith Dec 19 '11 at 3:49
@Zoredache i used visudo , what do you mean with valid config ? – Eslam Dec 20 '11 at 0:41
@KyleSmith :Matching Defaults entries for emamdouh on this host: env_reset User emamdouh may run the following commands on this host: (ALL : ALL) NOPASSWD: ALL (ALL) ALL – Eslam Dec 20 '11 at 0:43
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closed as off topic by SvenW, Shane Madden, Bart De Vos, Ward, MDMarra Dec 19 '11 at 20:05

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2 Answers

up vote 8 down vote accepted

Make sure that no rule below your mentioned rule are overriding it. From man sudoers (1.7.2p2):

   When multiple entries match for a user, they are applied in order.
   Where there are multiple matches, the last match is used (which is not
   necessarily the most specific match).
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you are right as output of sudo -l shows that there are two rules applied to that user – Eslam Dec 20 '11 at 0:45
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up vote 0 down vote

try 

userName ALL = NOPASSWD: ALL
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Please expand on your answer (why should they try this? what does it do?) -- See blog.serverfault.com/2011/06/09/press-the-green-button-twice – voretaq7♦ Dec 19 '11 at 3:25
nope, this wasn't the problem, the problem was that there was two rules applied to that user – Eslam Dec 20 '11 at 0:46
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