04-16-2015
Yes, sed writes the results it produces to its standard output. If you want the output saved in a file, you can redirect its output.
What operating system and shell are you using?
All of your sample files have some lines containing <carriage-return> characters. Some (maybe all) of your sample files have some lines that do not contain <carriage-return> characters. If these lines did not contain <carriage-return> characters, the standards would call these blank lines. Are you trying to create output files in DOS format (with all lines terminated by <carriage-return><newline> or are you trying to create output files in UNIX format (no <carriage-return>, just <newline> as the line terminator)?
What is your definition for empty line? The standards define an empty line to be a line that only contains one character (the <newline> character that terminates that line). Some of your files contain lines that only contain lots of <tab> characters terminated by a <carriage-return><newline> character pair. Do you consider that to be an empty line? Some of the DOS format blank lines appear as line 2 or 3 and are followed by other lines that still appear to be part of your headings. Some of your DOS format blank lines appear after what seems to be that file's heading and before that file's data.
Do you want add an empty line to your output file between the 5th and 6th input lines from your input files and also suppress copying all blank lines from your input (after removing <carriage-return>s)?
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gets(n) Tcl Built-In Commands gets(n)
__________________________________________________________________________________________________________________________________________________
NAME
gets - Read a line from a channel
SYNOPSIS
gets channelId ?varName?
_________________________________________________________________
DESCRIPTION
This command reads the next line from channelId, returns everything in the line up to (but not including) the end-of-line character(s), and
discards the end-of-line character(s). If varName is omitted the line is returned as the result of the command. If varName is specified
then the line is placed in the variable by that name and the return value is a count of the number of characters returned.
If end of file occurs while scanning for an end of line, the command returns whatever input is available up to the end of file. If chan-
nelId is in nonblocking mode and there is not a full line of input available, the command returns an empty string and does not consume any
input. If varName is specified and an empty string is returned in varName because of end-of-file or because of insufficient data in non-
blocking mode, then the return count is -1. Note that if varName is not specified then the end-of-file and no-full-line-available cases
can produce the same results as if there were an input line consisting only of the end-of-line character(s). The eof and fblocked commands
can be used to distinguish these three cases.
SEE ALSO
file(n), eof(n), fblocked(n)
KEYWORDS
blocking, channel, end of file, end of line, line, nonblocking, read
Tcl 7.5 gets(n)