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Remove blank line - SED


 
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# 8  
Mac line endings are Carriage Returns, so just converting CR to LF should make the file Unix-friendly.

Code:
tr '\r' '\n' <oldfile >newfile

Again, I urge you to search this site if this does not work directly; this question gets asked and answered every week in one form or another.
# 9  
To remove DOS-style line breaks:

Code:
sed '/^M$//' oldfile > newfile

Notice, that "^M" is a literal line break: in vi press "<CTRL>-<V>", then hit <ENTER> to enter it. You will notice that it is a single character rather than two chars.

To remove lines which contain any number of whitespace (Tabs and or blanks):

Code:
sed '/^[<tab><blank>]*$/d' oldfile > newfile

Enter a literal TAB-char (press <TAB>) and a blank, i just wrote it that way to make it easier to read.

Finally, to find out which unprintable character is bothering you: open the file in vi, enter command mode (press ":") and enter "set list". You will see all the unprintable characters as control codes now (tab characters are represented by "^I" for instance, etc.). Only a blank is now printed as blank char. Enter command mode again and use "set nolist" to switch that off again.

I hope this helps.

bakunin
# 10  
Or you can use cat with the -v or -A options (somewhat depending on your version of cat), or look at a hex dump with od or xxd or hexdump
# 11  
you can simply remove the blank line by doing
grep . file1 > file2

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