On 06/02/2014 14:06, Tino Sino wrote:
It has been asked before, but with different answers, e.g.:
1) dpkg-query --list | awk '/^ii +/ { print $2; }'
2) dpkg --get-selections | cut -f 1
3) ... etc ...
Given that the output is the same:
$ diff \
<(dpkg --get-selections | cut -f 1) \
<(dpkg-query --list | awk '/^ii +/ { print $2; }') \
&& echo same-output
same-output
I wonder, what's the golden way to do this and why?
Personaly, I use this:
aptitude search ~i\!~M --disable-columns -F "%p" > aptitude-packages.txt
options:
~i : "installed packages"
\!~M : "not automatically installed", in combination with ~i this means
you'll get a list of packages names you asked to
=aptitude install ...= explicitly (and not their respective
dependencies)
-F "%p" : format output to print only column of (untruncated) packages
names
--disable-columns : disable trailing padd of white-spaces at the end of
lines (in my opinion, this should be better handled
by aptitude, i.e., no padding when only one column
is to be displayed, etc.)
Then restore packages this way:
aptitude install $(cat aptitude-packages.txt)
Why do I use this?
Aptitude stores a flag for packages that were automatically
installed. This is handy since the packages list you have to preserve
is really shorter than the whole installed packages list. It makes
this list human readable and editable.
Nicolas
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