4. The default rm command will not con?rm before it deletes any regular ?les. Write a short script called safe rm, such that it will make a copy before deleting a single ?le (that is, we do not use wildcard expressions for this problem) by do the following: Take one and only one argument at the command line (hint: search for an expression representing the number of arguments in the shell scripts). Print out an error message if no argument or more than one arguments are provided (hint: use echo). Create a directory safe rm recycle in the current one if it is not already created. Copy the ?le indicated by the ?rst argument to this safe rm recycle folder. Remove this ?le in the current working directory. Hint: you can try using the commands (such as mkdir, cp commands) at the command line before you put them into the scripting program. In UNIX -d anyName will check if anyName is a directory. You may use this as the condition in an if statement. Example: if [ ! d anyName ] then Echo anyName is not an directory else Echo anyName is a directory fi

It's in unix/C-code