Shell Programming and Scripting

I need help with a shell script. I have a flat file with lines begining with 'newuser' in it along with other lines which do not have 'newuser' in the begining of the line

newuser (followed by 10 spaces) user1 user2

The script should accomplish following things

a. Ask the user for input of username
b. Scan the file and the lines which begin with 'newuser'
c. If in a line the number of words are less than 35 then it should add the username which the user inputs
d. If the line has more than 35 words then it should add another line beginning with 'newuser' followed by 10 spaces and then the usernames.

Any help is appreciated.

Is this homework? Look up the man page for grep (for searching - though I dont get why you have to do this). The length of a variable can be obtained in the sh family of shells by using

Code:

${#variable_name}