/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 vote125 views1 answer
Git get latest
Shell/Bash
0 vote94 views1 answer
Install ansible
Shell/Bash
0 vote130 views1 answer
Check Available SSH Keys on Your Computer
Shell/Bash
0 vote137 views1 answer
Ubuntu remove application icon
Shell/Bash
0 vote224 views2 answers
Git commit with message
Shell/Bash
7 votes170 views2 answers
Pip install urllib
Shell/Bash
6 votes142 views1 answer
Linux unzupgz files
Shell/Bash
0 vote129 views1 answer
Cvauc install package source
Shell/Bash
0 vote127 views1 answer
Head until last line
Shell/Bash
0 vote129 views2 answers
Sed print from match to end of file
Shell/Bash