/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

3 votes340 views1 answer
How to see all the extension installed in visual studio code
Shell/Bash
14 votes357 views5 answers
Git revert merge commit
Shell/Bash
0 vote321 views2 answers
Nmap os and version detection
Shell/Bash
1 vote302 views1 answer
Enable epel repo centos 7
Shell/Bash
0 vote340 views1 answer
Bluetooth xubuntu activate linux
Shell/Bash
0 vote323 views1 answer
Git rebase based on commit
Shell/Bash
2 votes316 views1 answer
Chmod
Shell/Bash
0 vote344 views1 answer
Install CasaOS
Shell/Bash
0 vote327 views1 answer
Ssh delete folders older than one year
Shell/Bash
0 vote322 views1 answer
How delete wireless connection raspberry pi terminal
Shell/Bash