Assignment 3

Bash Program

Write a bash program to align the comments in bash source file.

Comments start with an unquoted # which begins a word and end with a newline.

handling quotes is optional and complex – do this last for extra credit

lines without comments should not be changed

lines which begin with # should not be changed

other lines containing comments should have the comments moved

all comments should begin in the same column

2 columns after the end of the longest code (before comments)

example input

# begins with #

# begins with space

A=(foo bar)

B=(bax qux) # comment

C=(aaa bbb) # don't change indentation

echo ${#A[@]} # first # doesn't begin a word

echo " # not a comment"

echo " # comment""

echo \"" # not a comment\""

example output

# begins with #

# begins with space

A=(foo bar)

B=(bax qux) # comment

C=(aaa bbb) # don't change indentation

echo ${#A[@]} # first # doesn't begin a word

echo "" # not a comment""

echo "" # comment""

echo \"" # not a comment\""

Requirements

Use only bash and standard UNIX utilities:

do not use awk or other UNIX programming languages

Read from standard input