/Shell/Bash/What does the dollar sign mean in bash

What does the dollar sign mean in bash

$1, $2, $3, ... are the positional parameters.
"$@"  is an array-like construct of all positional parameters, {$1, $2, $3 ...}.
"$*"  is the IFS expansion of all positional parameters, $1 $2 $3 ....
$#    is the number of positional parameters.
$-    current options set for the shell.
$$    pid of the current shell (not subshell).
$_    most recent parameter (or the abs path of the command to start the current shell immediately after startup).
$IFS  is the (input) field separator.
$?    is the most recent foreground pipeline exit status.
$!    is the PID of the most recent background command.
$0    is the name of the shell or shell script.

Source: stackoverflow.com

Similar codes

0 vote385 views2 answers
How to remove git from ubuntu 21
Shell/Bash
0 vote350 views1 answer
Git close private repo
Shell/Bash
1 vote364 views2 answers
Xcopy folder to another folder
Shell/Bash
0 vote352 views1 answer
Unistall filezilla ubuntu
Shell/Bash
2 votes407 views2 answers
Batch remove double quotes
Shell/Bash
0 vote381 views1 answer
Get library list linux
Shell/Bash
0 vote391 views1 answer
Stop elasticsearch node
Shell/Bash
10 votes356 views4 answers
Copy ssh key mac
Shell/Bash
0 vote320 views10 answers
What is the different from Git and GitHub
Shell/Bash
0 vote376 views1 answer
Git discard all unpushed commits
Shell/Bash