How to Switch User Given a UID in Linux

linuxsusudouser-accounts

I only know the UID of a user, is it possible to switch user using UID in linux distribution like we do using username like su -u someuser?

Look up the username with the id command, e.g.:

id -un 1003

Then put it together with command substitution:

su - $(id -un 1003)

Yes, this is possible.

In /etc/sudoers the item immediately following the equals is the user that the command will be allowed to execute as.

tom  ALL=(oracle) /bin/chown tom *

The user (tom) can type sudo -u oracle /bin/chown tom /home/oracle/oraclefile

As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:

du -hs * | sort -h

If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:

brew install coreutils
du -hs * | gsort -h

From sort manual:

-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)