What are $PS1 - 4 in linux

PS1    The value of this parameter is expanded and used as the primary prompt string.  
PS2    The value of this parameter is expanded as with PS1 and used  as
       the secondary prompt string.  The default is ``> ''.
PS3    The value of this parameter is used as the prompt for the select
       command 
PS4    The value of this parameter is expanded  as  with  PS1  and  the
       value  is  printed  before  each command bash displays during an
       execution trace.  The first character of PS4 is replicated  mul-
       tiple  times, as necessary, to indicate multiple levels of indi-
       rection.  The default is ``+ ''.

@Zenonymous

Similar codes

2 votes101 views1 answer
Bash generate random number between
Shell/Bash
33 votes100 views6 answers
How to install chocolatey on windows 10
Shell/Bash
39 votes72 views3 answers
Chmod 777
Shell/Bash
0 vote136 views1 answer
Too many security failures vnc
Shell/Bash
0 vote105 views1 answer
I wrongly deleted code , can i retrieve through git command
Shell/Bash
0 vote106 views1 answer
You need to install postgresql-server-dev-X.Y for building a server-side extension or libpq-dev for building a client-side application.
Shell/Bash
0 vote128 views2 answers
Telnet test port udp
Shell/Bash
0 vote148 views1 answer
Reading state information... Done E: Unable to locate package docker-ce
Shell/Bash
22 votes108 views6 answers
Git untrack file
Shell/Bash
0 vote123 views1 answer
Dd write iso to usb linux
Shell/Bash