awk
http://akiniwa.hatenablog.jp/entry/2014/04/08/220430
http://hydrocul.github.io/wiki/commands/awk.html
sort
http://d.hatena.ne.jp/a_bicky/20110724/1311497192
join
http://yut.hatenablog.com/entry/20120907/1346975281
comm
http://codezine.jp/unixdic/w/comm
http://monmon.hateblo.jp/entry/20130722/1374477208
spreadsheetでtimestamp変換
=SUM((J1 + 32400) / 86400 + 25569)