/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 vote160 views1 answer
Bash find text in specific file
Shell/Bash
0 vote170 views2 answers
Show CSF version
Shell/Bash
1 vote192 views1 answer
Install x centos 7
Shell/Bash
0 vote177 views1 answer
Change desktop icon size ubuntu
Shell/Bash
0 vote183 views2 answers
How to sign virtualbox kernel modules
Shell/Bash
75 votes175 views6 answers
Fatal: remote origin already exists.
Shell/Bash
0 vote176 views1 answer
Github fork subdirectory
Shell/Bash
0 vote173 views1 answer
H\nohup out with diffrent name
Shell/Bash
3 votes170 views2 answers
Sass : The term 'sass' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
Shell/Bash
0 vote174 views1 answer
Debian pinning packages
Shell/Bash