发个更长的
sed "/^\([0-9]\{17\}\)[0-9xX]*$/{s/^\([0-9]\{6\}\)\([0-9]\{4\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/\2-\3-\4/};/^\([0-9]\{15\}\)$/{s/^\([0-9]\{6\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/19\2-\3-\4/};/^\([0-9-]\{10\}\)$/!d" test.txt
sed "/^\([0-9]\{17\}\)[0-9xX]*$/{s/^\([0-9]\{6\}\)\([0-9]\{4\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/\2-\3-\4/};/^\([0-9]\{15\}\)$/{s/^\([0-9]\{6\}\)\([0-9]\{2\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/19\2-\3-\4/};/^\([0-9-]\{10\}\)$/!d" test.txt