10-16-2012
First: From the way this is worded, I assume it is homework incorrectly filed in a non-homework forum.
Second: I don't see any "comments" in your input; I just see a quoted string.
Third: I'm not sure what you mean by "line spaces". I assume you're talking about empty lines (lines where the only character on the line is the <newline> terminating the line) or blank lines (lines where the only characters on the line are <space> and <tab> characters followed by the <newline> terminating the line). But, while you talk about removing "line spaces", your example adds an empty or blank line in one place and removes one in two other places.
This has probably been sitting here unanswered for almost a full day because we can't figure out what you want.
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uniq(1) General Commands Manual uniq(1)
Name
uniq - report repeated lines in a file
Syntax
uniq [-udc[+n][-n]] [input[output]]
Description
The command reads the input file comparing adjacent lines. In the normal case, the second and succeeding copies of repeated lines are
removed; the remainder is written on the output file. Note that repeated lines must be adjacent in order to be found. For further infor-
mation, see
Options
The n arguments specify skipping an initial portion of each line in the comparison:
-n Skips specified number of fields. A field is defined as a string of non-space, non-tab characters separated by tabs and spaces from its
neighbors.
+n Skips specified number of characters in addition to fields. Fields are skipped before characters.
-c Displays number of repetitions, if any, for each line.
-d Displays only lines that were repeated.
-u Displays only unique (nonrepeated) lines.
If the -u flag is used, just the lines that are not repeated in the original file are output. The -d option specifies that one copy of
just the repeated lines is to be written. The normal mode output is the union of the -u and -d mode outputs.
The -c option supersedes -u and -d and generates an output report in default style but with each line preceded by a count of the number of
times it occurred.
See Also
comm(1), sort(1)
uniq(1)