$ rpm -qa --qf '[%{PROVIDES}\n]' |grep -Po '^lib[^/()]+[.]so\b[^/()]*' outputs lines that match the soname pattern as well as lines that do not match the pattern; and even empty lines which are not in the input. http://lists.altlinux.org/pipermail/devel/2007-January/041110.html
grep -P is also utterly broken, besides of -o option: $ for i in `seq 1 999`; do rpm -qa --qf '[%{PROVIDES}\n]' |grep -P '^lib[^/()]+\.so' |grep -vc ^lib; done |sort |uniq -c |sort -n 3 2 62 3 934 1 Thats is, looks like grep -P returns semi-random wrong results.
Something odd happens with pipes: replacing rpmquery -a --qf '[%{PROVIDES}\n]' with cat file makes grep -Po happy.
In grep-2.6.3-alt1 the bug is already fixed.
