write a bash shell program named L1 as follows . L1 expectsexactly 2 command line arguments. expects $1 to contain onlydigits. expects $2 to have exactly 4 characters (can be anycharacter).
if NOT exactly 2 command line arguments, echo \"need 2 args \" andexit.
otherwise, if $1 and/or $2 have incorrect value(s) (as above),echo \"bad argX\", where X is the first incorrect argument, andexit.
otherwise, echo \"good \". you can use echo,grep, pipe to check ifthe argument have the required characters.
example:
>L1 849474 0-=~
good
>L1 47347 8x
bad arg2
>L1 123abc 8d
bad arg1
