kindly help me with one or more unix shell program.?

Question

1. to generate squareroot of any number entered through keyboard.

2. to check whether a given file is readable and writeable or both.

3. to check whether a given date is valid or not.(date format ddmmyy)

4. prog. to search multiple words per line.

Answer 1

This is not the right place for lazy students....
Go and get your book,work out,learn..
Have a nice Day

Answer 2

Again, this would best be done by using Perl. A tutorial can be found at http://www.comp.leeds.ac.uk/Perl/basic.html.

I don't know if Perl has a square root function, but you can just use whatever power function (i believe it is **) to raise a number to the 1/2.

2 - you just have to try to open the file for reading, and then for writing and test if its successful or not. you can't rely on the `ls -al` command unless you have which group and user you are readily available to match

3 - there are string manip functions

4 - see 3.

Answer 3

Go through UNIX programming by DASS.
You will find most of these purpose commands. Check it first.