/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 vote323 views1 answer
Zsh-autosuggestions
Shell/Bash
0 vote318 views1 answer
Add user to dialout group
Shell/Bash
8 votes317 views5 answers
We no longer support global installation of Create React App
Shell/Bash
0 vote311 views1 answer
Turn redis off
Shell/Bash
0 vote319 views1 answer
Change nohup name
Shell/Bash
0 vote291 views1 answer
Clear error log apache2
Shell/Bash
4 votes298 views1 answer
Mv folder linux
Shell/Bash
2 votes330 views2 answers
The type initializer for 'SkiaSharp.SKImageInfo' threw an exception.
Shell/Bash
1 vote313 views1 answer
2 layer high resolution linux
Shell/Bash
0 vote300 views1 answer
Screen
Shell/Bash