Write a script set_x_permission.sh that takes a filename as an argument and adds execution permission to the file for the user if the file is a regular file. Make sure that your script checks for error conditions. Use the following pseudocode to develop your script: (write the equivalent in C++. )

#!/bin/bash

if # of arguments is one

then

if file in $1 exists

then

if file in $1 is a regular file

then

add execute permission

else

print message that this is not a regular file

fi

else

print message that the file does not exist

fi

else

print the "Usage" message

fi