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What is the difference between $ and # signs in Linux environment? As I started working on Linux and I found that both are different. I mean they do have different set of privileges...?

[root@localhost ~]# and [tom@localhost ~]$.

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In short, if the screen shows a dollar sign ($) or hash (#) on the left of the blinking cursor, you are in a command-line environment.

$, #, % symbols indicate the user account type you are logged in to.

  • Dollar sign ($) means you are a normal user.
  • hash (#) means you are the system administrator (root).
  • In the C shell, the prompt ends with a percentage sign (%).

There are differences on prompts in different Unix or GNU/Linux distributions because of their default settings. For example, the prompt of Debian/Ubuntu is guest@linux:~$, the one of Fedora/CentOS/RedHat is [guest@linux ~]$ and the one of SuSE Linux/OpenSUSE is guest@linux:~>. In general, the prompt usually show the login user name, machine hostname, and current working directory and ended with a dollar ($), percentage (%), or hash (#) sign.

guest@linux:~$ 
  • guest - username: the user account you are logged in to.
  • linux - machine hostname: the machine you are operating.
  • ~ - current working directory: the directory you are in. Tilde (~) means home directory, i.e. the default directory when first logging in.

Reference: wiki.debian.org.hk/w/Basic_Command_Line

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  • @reverseiblean thanks for quik reply.Now i can see $ and # in centos promt.
    – Nagendra
    Dec 5 '15 at 10:39
  • for root user # and for tom or other users it is $
    – Nagendra
    Dec 5 '15 at 10:40
  • @GayanWeerakutti What does dollar sign do in this command chattr +i "$(realpath /etc/resolv.conf)" I found it on another question and I need clarification. Thanks.
    – Shayan
    Aug 23 '19 at 18:07
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    @GayanWeerakutti It makes sense because /etc/resolv.conf was a symlink in pre-systemd days to /run/resolvconf/resolv.conf file. Not entirely sure how it's used now, though. And chattr apparently doesn't work on symlinks Aug 24 '19 at 8:05
  • 1
    In fact, there's actually a whole question about it Aug 24 '19 at 8:07

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