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May 19, 2015 - A Look At The New Commandlinefu
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Re-emerge all ebuilds with missing files (Gentoo Linux)

Terminal - Re-emerge all ebuilds with missing files (Gentoo Linux)
emerge -av1 $(for e in `qlist -I --nocolor | uniq`; do for f in `qlist -e $e`; do if test ! -e $f; then echo $e; echo $e: missing $f 1>&2; fi; done; done)
2010-07-04 18:23:59
User: and3k
Functions: echo test
1
Re-emerge all ebuilds with missing files (Gentoo Linux)

This loops through all installed ebuilds and checks if every file that should be installed is still there and if not adds it to emerge. It includes a verbose output to stderr too.

If you have packages installed that have whitespace in their filenames you have to change the IFS to "newline".

Alternatives

There are 3 alternatives - vote for the best!

Terminal - Alternatives
emerge -av1 `qlist --installed --nocolor | uniq | while read cp; do qlist --exact $cp | while read file; do test -e $file || { echo $cp; echo "$cp: missing $file (and maybe more)" 1>&2; break; }; done; done`
2010-07-04 19:55:42
User: Flameeyes
Functions: echo read test uniq
3

Revised approach to and3k's version, using pipes and read rather than command substitution. This does not require fiddling with IFS when paths have whitespace, and does not risk hitting command-line size limits.

It's less verbose on the missing files, but it stops iterating at the first file that's missing, so it should be definitely faster.

I expanded all the qlist options to be more self-describing.

emerge -a `qcheck -aCB`

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