Re: Getting a text file rid of all superfluous blank lines

From: Tim (ignored_mailbox_at_yahoo.com.au)
Date: 11/30/05

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Thu, 01 Dec 2005 00:23:55 +1030

    Tim:

    >> I used to know of something that did that (something with various
    >> different reformatting options for massaging text files), but I can't
    >> think what it was. Quickly looking at the man file for the cat program,
    >> you could do something like:
    >>
    >> cat --squeeze-blank inputfilename -> outputfilename

    Paul Smith:
    > Thanks, Tim and Paul. Paul's method does not mysteriously work:
    >
    > $ more file1.txt
    > word1
    >
    >
    >
    > word2
    >
    > word3
    > $ more -s file1.txt > file2.txt
    > $ more file2.txt
    > word1
    >
    >
    >
    > word2
    >
    > word3

    Hmm, seems to work for me. Both with the "less" and "more" programs, as
    well as the "cat" program.

    > Tim's way works partially, i.e., many blank lines are in effect
    > erased, but some remain. I suspect that the left blank lines are not
    > blank lines although they look like blank lines. Can one go further
    > with deleting the left "false" blank lines?

    In what way do they remain? Can you provide an actual example? (Rather
    than an explanation of what's happening.)

    What I see is that all consecutive blank lines are replaced by a single
    blank line, on the file I tried it with.

    e.g. Tested on /etc/selinux/targeted/contexts/files/file_contexts

    If you want to remove all blank lines, then perhaps you could use grep. 

    -- 
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