NAME: .......................................... DUE DATE: Jan 19, 1999
1. (10 points)
List the name of each file in the current directory(or any subdirectory of it) which is a regular file, together with the first line of the file.
A regular file is essentially one which is not a directory.2. (10 points)
Write a script which will take text input from standard input, and copy it to standard output with each line preceded by a line number in the same manner as cat -n. Do not use the command cat.3. (10 points)
Write a script called saytime which will print out the current time in words.4. (20 points)
Write a function changedir which will prompt you for a directory name and cd to that directory. Why must you use a function, and not a script?5. (20 points)
Write a script which will every minute display the date and time, but when run in the foreground will terminate if it receives ctrl-C 3 times.6. (30 points)
Write a script called pythagoras which will take two numerical arguments, representing the base length and the height of a right-angled triangle, plus one or two options -a and -h(meaning area and help). With option -a, the area of the triangle will be printed on standard output preceded by the message AREA is, and with option -h a short help message will be printed. With no options, there will be no output; any other option will be ignored, except that a warning message will be output on standard error.