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This article is about what $means in linux. The editor thought it was very practical, so I shared it with you as a reference. Let's follow the editor and have a look.

The $in linux, that is, the "command prompt", is where you can enter a command. The command prompt may prompt the current user for some information. Under linux, the user will be prompted for the current directory and the current user.

Attached:

The name of the execution of the $0 program

The nth parameter value of this program, natively 1.. 9

$* all parameters of this program, this option can have more than 9 parameters.

$# the number of parameters of this program

$PID of this program (ID number of the current process in which the script is running)

$! The PID that executed the previous background instruction (the process ID number of the last process running in the background)

$? The return value of executing the previous instruction (displays the exit status of the last command. 0 means there is no error, and any other value indicates an error)

$- displays the current options used by shell, with the same function as the set command

$@ is similar to $*, but can be used as an array

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