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

21 votes166 views2 answers
What is ssh
Shell/Bash
0 vote146 views1 answer
Xargs parameter
Shell/Bash
12 votes148 views5 answers
Fetch all git branches
Shell/Bash
-2 votes132 views1 answer
Generate rs256 key pair
Shell/Bash
0 vote144 views2 answers
Raspberry pi ubuntu server raspi-config
Shell/Bash
1 vote152 views1 answer
How to download youtube vides on linux
Shell/Bash
1 vote187 views1 answer
If else in mac terminal
Shell/Bash
0 vote294 views1 answer
How to check the version of hyper ledger in ubuntu
Shell/Bash
1 vote148 views1 answer
Raspberry pi scan networks
Shell/Bash
3 votes140 views1 answer
Delete mulitple git branch
Shell/Bash