Linux - Change The Hostname in The Cli

Linux - change the hostname in the CLI

you can type "hostname HOSTNAME" where HOSTNAME is the new name you want. The next time you log in / connect via ssh, that's what you'll see.

How to hide the hostname on the terminal on linux?

If you want a temporary solution(since you are talking about a screencast), you can set your PS1 variable to change the prompt.

For example, if you want your prompt to be:

$

Then set your PS1 variable as follows on the terminal:

export PS1='$ '

Likewise, you can have it to whatever you want the prompt to look like. If you want the path to be displayed, set it as:

export PS1='\w '

For a permanent solution, you can set this in your shell configuration script, which is your ~/.bashrc file in case you have bash as your shell.

Change hostname on SSH session

Like Matt said. There is similar question on Unix.stackexchange

And you find some Background
here

Modify PS11

PS1="touch me : "

Bash - PS1 not Updating With Proper Hostname after Hostname Change in Script

There is no way to make Bash to update the value which the \h is translated to. It is read once at startup and is not modified afterwards. So the only options if you need to get an updated prompt are:

• start a subshell — bash
• replace current shell with a new one — exec bash
• update PS1, replacing \h with $(hostname) or a literal string

Now, more into Bash internals. The hostname value is kept in the current_host_name variable, which is defined in shell.h:113:

extern char *current_host_name;

It is used in three places, variables.c:695:

temp_var = set_if_not ("HOSTNAME", current_host_name);

parse.y:6039:

case 'h':
case 'H':
  t_host = savestring (current_host_name);
  if (c == 'h' && (t = (char *)strchr (t_host, '.')))
...

and y.tab.c:8333:

case 'h':
case 'H':
  t_host = savestring (current_host_name);
  if (c == 'h' && (t = (char *)strchr (t_host, '.')))
...

And it is assigned a value only once (besides initialization with an empty string) in the shell_initialize() function in shell.c:1918:

/* It's highly unlikely that this will change. */
if (current_host_name == 0)
  {
    /* Initialize current_host_name. */
    if (gethostname (hostname, 255) < 0)
      current_host_name = "??host??";
    else
      current_host_name = savestring (hostname);
  }

All the line numbers and file names are from the source code from bash-5.1.tar.gz from the mirror at kernel.org.

Change the From: address in Unix mail

In my version of mail ( Debian linux 4.0 ) the following options work for controlling the source / reply addresses

• the -a switch, for additional headers to apply, supplying a From: header on the command line that will be appended to the outgoing mail header
• the $REPLYTO environment variable specifies a Reply-To: header

so the following sequence

export REPLYTO=cms-replies@example.com
mail -aFrom:cms-sends@example.com -s 'Testing'

The result, in my mail clients, is a mail from cms-sends@example.com, which any replies to will default to cms-replies@example.com

NB: Mac OS users: you don't have -a , but you do have $REPLYTO

NB(2): CentOS users, many commenters have added that you need to use -r not -a

NB(3): This answer is at least ten years old(1), please bear that in mind when you're coming in from Google.

Adding host name to /etc/hosts in Linux

dhcpcd has a -c/--script option to run an external script anytime it configures or brings up an interface. You can use this to manually update the hosts file with the configured hostname.

Postgresql - adding hostname / port to commandline

Yes, you can use environment variables PGHOST and PGPORT.

See https://www.postgresql.org/docs/current/libpq-envars.html

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