Parameter parsing the $

EX:

#!/bin/sh

echo "number:$#"
echo "scname:$0"
echo "first :$1"
echo "second:$2"
echo "argume:$@"

echo "show parm list:$*"
echo "show process id:$$"

echo "show precomm stat: $?"

 

 

./test.sh aa bb

RESULT:

number:2
scname:./variable
first:aa
second:bb
argume:aa bb

show parm list:aa bb
show process id:24544

show precomm stat:0

 

 

$ # Is the number of parameters passed to the script

$ 0 is the name of the script itself

$ 1 is the first argument passed to the shell script

$ 2 is the second parameter passed to the shell script

$ @ Is a list of all the parameters passed to the script

$ * Is a single string that is displayed all the different parameters passed to the script, and location variables, parameters can be more than 9

$$ script is running the current process ID number

$? Exit status of the last command is displayed, and 0 indicates no error, the other indicates an error code reader is used to exit the shell vinegar