The Unix operating system was pioneered by Ken Thompson and Dennis Ritchie at Bell Laboratories in the late 1960s. One of the primary goals in the design of the Unix system was to create an environment that promoted efficient program development.

1-Write the grep command to output all lines that begin with an uppercase T.

2-Write the grep command to output all lines that end with a lowercase n.

3-Write the grep command to match and output all lines that have a lowercase p followed by any single character followed by a lowercase o.

4-Write the grep command to match and output all words that contain digits.

5-Write the grep command to match and output a sequence of alphabetic letters that is exactly 9 characters long.

6-Write a command using tr to remove all spaces (all the space characters) from intro.txt

7-Write a command using sed to remove all spaces (all the space characters) from intro.txt