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 votes166 views1 answer
Ubuntu delete from ssh known hosts
Shell/Bash
0 vote142 views2 answers
How to move file using move command cmd
Shell/Bash
0 vote139 views2 answers
Get string after character shell script
Shell/Bash
9 votes138 views1 answer
How to install vscode on manjaro linux
Shell/Bash
0 vote147 views1 answer
Linunx reload shell
Shell/Bash
0 vote154 views1 answer
Install sapper
Shell/Bash
1 vote143 views1 answer
Installing star aligner in macOS
Shell/Bash
0 vote168 views1 answer
Linux command print only odd columns
Shell/Bash
0 vote143 views1 answer
How to zip a folder in ubuntu 20.04
Shell/Bash
11 votes147 views1 answer
Install intellij linux command line
Shell/Bash