获取Gentoo Linux中动态集的包名

Question

我想得到一个清单，例如，在我的Gentoo Linux系统上的所有活动包(即版本9999)。这些内容包含在(动态生成的) @live-rebuild包集中。

我可以通过运行emerge -pav @live-rebuild将它们打印到屏幕上；但这也给了我许多其他细节和语法：

zenbookhost ~ # emerge -pav @live-rebuild

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   *] sci-libs/nipy-9999::neurogentoo  PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] app-misc/repositorg-9999::chymeric  PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R    ] dev-python/yahoo-finance-9999::chymeric  USE="{-test}" PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] sci-biology/ants-9999::neurogentoo  0 KiB
[ebuild   R   *] sci-libs/labbookdb-9999::chymeric  PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] dev-python/matrix2latex-9999::neurogentoo  PYTHON_TARGETS="python2_7 python3_4" 0 KiB
[ebuild   R   *] dev-python/tqdm-9999::gentoo  PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] sci-biology/psychopy-9999::neurogentoo  PYTHON_TARGETS="python2_7" 0 KiB
[ebuild   R   *] sci-biology/nilearn-9999::neurogentoo  USE="plot {-test}" PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] sci-biology/dcmstack-9999::neurogentoo  USE="{-test}" PYTHON_TARGETS="python2_7 python3_4 -python3_5" 0 KiB
[ebuild   R   *] sci-visualization/mricron-9999::neurogentoo  0 KiB

Total: 11 packages (11 reinstalls), Size of downloads: 0 KiB

有什么方法可以像我运行category/package那样只获取cat /var/lib/portage/world名称吗？对于上述情况，将是：

sci-libs/nipy
app-misc/repositorg

诸若此类。

理想情况下，我将查找emerge命令的一个参数，该参数只返回包名，或者保存这些集合的某个文件(如/var/lib/portage/world)。

Answer 1

如果您有GNU grep，您可以使用它的-P标志来表示PCRE mode，而对于只匹配的模式使用-o，

emerge -pav @live-rebuild | grep -Po "\[.*\]\s\K[a-zA-Z0-9-]*\/[a-zA-Z]*"
sci-libs/nipy
app-misc/repositorg
dev-python/yahoo
sci-biology/ants
sci-libs/labbookdb
dev-python/matrix
dev-python/tqdm
sci-biology/psychopy
sci-biology/nilearn
sci-biology/dcmstack
sci-visualization/mricron