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How do I change the file permission of a file to 700 ?

I am using Ubuntu Live CD. I tried sudo chmod 777 abc

It does not change the permission and still shows:

-rw-r--r--  1 ubuntu ubuntu   18 2012-01-14 03:02 abc

Using Latest Ubuntu 11+

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migrated from Jan 14 '12 at 6:13

This question came from our site for professional and enthusiast programmers.

It's hard to tell without knowing where the file is, but, making an educated guess, I'd say the file might be on a read only file system. If that's the case, chmod won't work.

It would also not work of the file is on a non-linux file system like FAT or NTFS. Linux permissions only work on Linux file systems.

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The file is on d: drive. Not on CD of course !! :) I can create files on that drive by can not change file permissions. – shantanuo Jan 14 '12 at 9:00
@shantanuo The output of mount says if the drive is mounted rw or ro (read-write/read-only). – lumbric Jan 14 '12 at 12:34

Are you trying to change file permissions on files in LiveCD? You can't because CD is mounted as read-only.

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