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In order to memorize a command, it is usually a good idea to learn where it's name comes from. For example, cp comes from copy. usermod means "User Modifiy" (at least I guess so).

Where does chmod come from, what does it mean?

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    Wikipedia is your friend for these: en.wikipedia.org/wiki/Chmod. Believe it or not there are topics for most of the commands. – slm May 9 '14 at 2:09
  • You are right, it's say so right in the beginning – felknight May 9 '14 at 2:23
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    Consult the man pages, there is a wealth of information given in them. In your case, "man chmod". – delta24 May 9 '14 at 3:18
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change mode

It is the full form of the command. So basically you are changing the mode set as something to some other thing.

Read only permission to Read/Write permission, revoking read/write permission to just read only permission etc.

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    You're not IMO changing read to write or anything like that. You are just modifying the permissions for read/write/execute. – Pavel Šimerda May 9 '14 at 7:39
  • @PavelŠimerda, Thanks for pointing it out. I have edited the answer :) – Ramesh May 9 '14 at 14:34
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    When thinking about the terminology, it may also be helpful to know that permissions are stored together with file type (regular-file, directory, pipe, char-device, block-device, etc.) in a single integer field which is usually called the "mode" of the file. (struct stat's st_mode in userspace; struct inode's i_mode in the kernel). – user41515 May 10 '14 at 13:44
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CHange MODe.

[root@localhost /]# apropos -e chmod -s 1
chmod (1)            - change file mode bits
[root@localhost /]#

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