[Bug 383667] [NEW] provide a 7zcat alias and a way to compress directly from stdin to stdout

[Everthon Valadão]

Public bug reported:

Binary package hint: p7zip

1) Sometimes you just want to "grep" someting in a compressed text file,
but it is too big to be decompressed and then processed. This is why I
love zcat and bzcat: I could decompress and pipe it on the flow to
grep/awk/whatever, but unfortunately I do not see a 7zip cat like. 7zip
command line options are too many and hard to remember, so I put this
alias in my ~/.bashrc:

    alias 7zcat='7za e $@ -so 2> /dev/null'

I wish this alias came pre-installed with p7zip :-)
OBS.: the redirection of stderr to /dev/null is because 7z doesn't have a --quiet option (could you fix this too?)

2) I wonder if there is some way to compress with 7zip exactly like I do with gzip:
    echo "foo" | gzip -c > foo.gz
The 7zip manpage gives this example (with gzip compression):
    echo "foo" | 7za a dummy -tgzip -si -so > foo.gz
but with 7zip compression, the closest I got was
    echo "foo" | 7za a -t7z -si foo.7z
so, how to redirect the output to /dev/stdout when reading from /dev/stdin? I mean, it is this possible via some bash-fu, named pipes, etc?

original source: http://mobilevs.blogspot.com/2009/06/7zcat.html

** Affects: p7zip (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 7zcat alias zcat

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provide a 7zcat alias and a way to compress directly from stdin to stdout
https://bugs.launchpad.net/bugs/383667
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