Special variables for Linux shell programming

$ A This is the path to the script file itself (relative path)

If there is an execution script file under the current directory, you cannot write an absolute path for execution.

$# this variable to record the number of input parameters

6 is the number of arguments that are entered when the command is executed.

$* This variable remembers all the input parameters.

[email protected] This variable also remembers all the input parameters.

So what's the difference between [email protected] and $*? [email protected] is to synthesize three parameters into a string, while $* is three arguments as three strings

Special variables for Linux shell programming