Shell script variable $#,$*,$$,$@,$0,$1,$2,$? meaning __shell Script

Parameter description

1:$# indicates the number of incoming arguments executed by the script

2:$* indicates that the execute script passes in the argument list

3:$$ represents the Process ID

4:$@ indicates that the execute script passed in all parameters

5:$0 to execute script name

6:$1 represents the first parameter

7:$2 represents a second parameter

8:$? Indicates that script execution state 0 is normal, others indicate error experiments and results

#!/bin/sh

echo "Parm number is: $#"
echo "Parm list is: $*"
echo "All Parm are: $@"

echo "process is: $$"

echo "File name is: $"
echo "The" "the" the "the" is: $ "
echo "stat is: $?"

-----------------------------Implementation and Results------------------------------

Execution: Sh shelltest.sh "The" the "the" "The Parm" "The second Parm"

Parm number Is:2
Parm list is:the Parm second Parm
All Parm is:the parm second Parm
Process is:28669
File name is:shellTest.sh
The Parm is:the-A-parm
Stat is:0