Linux – What’s the difference between “su” and “su -“

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In a UNIX machine, what is the difference between su and su -?
Is there even a difference?
I know that su - is the standard.

Best Answer

Well the su - "Username" or su -1 "username" or su --login "username" (all the same) will give you a login screen, and change paths, home directory, etc..

The su "username" command only chances user, and not home directories (this does not apply to "su no username" because you login has Root / SuperUser, and you will given the root's default environment, including path to executable file changes. You will also land into the root's home directory.) so to answer your question to make sure they are in the right place with the right user?

Ref link : https://www.tecmint.com/difference-between-su-and-su-commands-in-linux/

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Linux – Path difference between ../ and ./

./ means the current directory

../ means the parent of the current directory, not the root directory

/ is the root directory

myfile.text is in the current directory, as is ./myfile.text

../myfile.text is one level above you and /myfile.text lives in your root directory.

Linux – the difference between &> and >& in bash

From the bash man page:

There  are  two  formats  for  redirecting standard output and standard
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          &>word
   and
          >&word

   Of the two forms, the first is preferred.  This is semantically equiva-
   lent to

          >word 2>&1

Read the redirection section of the bash man page.

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