AnonSec Shell

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Current File : /usr/share/doc/less/LESSOPEN

From the man page:
       You  may  define an "input preprocessor" for less.  Before
       less opens a file, it first gives your input  preprocessor
       a  chance  to  modify the way the contents of the file are
       displayed.

What this means is that less(1) can automatically open up tar files,
uncompress gzipped files, and even display something reasonable for
graphics files.

You just need to put the following in your
.zlogin/.login/.bash_profile/whatever:

eval $(lesspipe)
or
eval $(lessfile)

lesspipe will toss the contents/info on stdout and less will read them
as they come across.  This means that you don't have to wait for the
decoding to finish before less shows you the file.  This also means that
you'll get a 'byte N' instead of an N% as your file position.  You can
seek to the end and back to get the N% but that means you have to wait
for the pipe to finish.

lessfile will toss the contents/info on a file which less will then
read.  After you're done, lessfile will then delete the file.  This
means that the process has to finish before you see it, but you get nice
percentages (N%) up front.

If you have some additional tests for binary files that I don't handle, go
ahead and send them to me.  Note that I will never integrate commands
for text files.  If you want to add man-ifying or html-izing commands to 
your copy of lesspipe, go ahead, they just won't be integrated in the
main distribution.

Here are two additional tests that you might like to use but aren't in
the lesspipe script due to speed or principle of least surprise.

    # Decode directories:
    if [ -d "$1" ]; then
	echo "$1:"; ls -l $1
    else

    # view strings inside of an executable
    if [ -x "$1" ]; then
        type=$(file "$1")
        case "$type" in 
          *executable* )
            echo -e "$type\n"
            strings "$1"
            ;;
        esac
    fi

These two entries courtesy of Adrian Bridgett <adrian.bridgett@poboxes.com>.
Please send in your entries as well.

If you have any questions, send me e-mail at <torin@daft.com>.
Mentioning less in the subject line will help.

Anon7 - 2022
AnonSec Team