camestres.com http://blog.camestres.com so many things, so little time Fri, 30 Jul 2010 07:22:57 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Ordinamento hash http://feedproxy.google.com/~r/camestres/~3/R3YEtYIIXQI/ http://blog.camestres.com/2010/07/30/ordinamento-hash/#comments Fri, 30 Jul 2010 07:18:13 +0000 pm http://blog.camestres.com/?p=179 Recentemente ho dovuto affrontare il problema dell’ordinamento di hash. Un problema abbastanza comune: ordinamento di un elenco di comuni in base alla sigla della provincia e in base al nome del comune. Quindi abbiamo due ordinamenti, e, conseguentemente, due criteri di ordinamento. Il primo criterio di ordinamento non deve essere alfabetico; deve essere programmabile, dinamico, non deciso a priori. Il secondo deve essere alfabetico.

Elenco risorse:

Tutorial Sun sulle Collections

]]> http://blog.camestres.com/2010/07/30/ordinamento-hash/feed/ 0 http://blog.camestres.com/2010/07/30/ordinamento-hash/ Agevolare lettura file di log http://feedproxy.google.com/~r/camestres/~3/_iBaHsYDJtI/ http://blog.camestres.com/2010/07/30/agevolare-lettura-file-di-log/#comments Fri, 30 Jul 2010 07:13:05 +0000 pm http://blog.camestres.com/?p=469 Problema: i file di log di un application sever in cluster sono separati: uno per server. La situazione di partenza è quindi: server1.log, server2.log; come si fa ad ottenere un unico file ordinato cronologicamente, senza righe ‘doppie’?

Soluzione:

$ cat server1.log server2.log | sort | uniq > server_regsptjb.log

Il primo comando accoda semplicemente un file all’altro, il risultato viene ordinato, assumendo che ciascuna linea ini con un numero seriale o una data, poi vengono rimosse le linee duplicate e infine il tutto viene scritto sul file.

Riferimenti:

http://serverfault.com/questions/58124/automatically-merge-log-files-keeping-all-lines

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