a) Write A shell script that takes a command –line argument and reports on whether it is directry ,a file,or something else
b) Write a shell script that accepts one or more file name as a arguments and converts all of thenm to uppercase,provided they exits in the current directory
c) Write a shell script that determines the period for which a specified user is working on the system
echo "Enter a file name:"
if [ -f $f ]
elif [ -d $f ]