/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

6 votes350 views2 answers
Linux cp
Shell/Bash
0 vote397 views1 answer
Open gas less example
Shell/Bash
0 vote323 views1 answer
Sed insert multiple lines after match
Shell/Bash
126 votes342 views6 answers
Git remote set-url origin
Shell/Bash
8 votes351 views2 answers
Compress a folder linux zip
Shell/Bash
0 vote363 views1 answer
Batch color escape character
Shell/Bash
17 votes325 views4 answers
Cmd composer
Shell/Bash
0 vote364 views1 answer
Git exclude nested folder
Shell/Bash
0 vote317 views2 answers
Scripting sobre ficheros
Shell/Bash
5 votes353 views6 answers
Npm install webpack
Shell/Bash