sudo yum update and sudo yum update -y

what is effect of running above command ?
aasheeAsked:
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farzanjConnect With a Mentor Commented:
sudo is used if you are not root.  It gives you root privileges

update would update the packages you want to update.

-y option is for 'yes'.  If you don't have it, it asks you whether you want to incorporate the changes, install the packages, etc.
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farzanjCommented:
To run yum, your yum repository should be properly configured.
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torimarCommented:
'sudo' will only be available if the sudo command has been properly installed and configured. Not on every system will that be the case.

But you can use the 'su -c' command to replace it. This should work on practically every system for elevating your privileges. The above commands would then read:

su -c 'yum update'
su -c 'yum update -y'

More on the 'yum' command can be found in the manuals: http://www.centos.org/docs/5/html/yum/
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