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1、www.it-ebooks.infowww.it-ebooks.infoEffectiveawkProgrammingArnoldRobbinswww.it-ebooks.infoTomyparents,fortheirlove,andforthewonderfulexampletheysetforme.TomywifeMiriam,formakingmecomplete.Thankyouforbuildingyourlifetogetherwithme.ToourchildrenChana,Rivka,Nachum,andMalk
2、a,forenricheningourlivesininnumerableways.www.it-ebooks.infowww.it-ebooks.infoForewordtotheThirdEditionMichaelBrennanAuthorofmawkArnoldRobbinsandIaregoodfriends.Wewereintroducedin1990bycircumstances—andourfavoriteprogramminglanguage,awk.Thecircumstancesstartedacoupleof
3、yearsearlier.IwasworkingatanewjobandnoticedanunpluggedUnixcomputersittinginthecorner.Nooneknewhowtouseit,andneitherdidI.However,acoupleofdayslater,itwasrunning,andIwasrootandtheone-and-onlyuser.Thatday,IbeganthetransitionfromstatisticiantoUnixprogrammer.Ononeofmanytrip
4、stothelibraryorbookstoreinsearchofbooksonUnix,Ifoundthegrayawkbook,a.k.a.AlfredV.Aho,BrianW.Kernighan,andPeterJ.Weinberger’sTheAWKProgrammingLanguage(Addison-Wesley,1988).awk’ssimpleprogrammingparadigm—findapatternintheinputandthenperformanaction—oftenreducedcomplexort
5、ediousdatamanipulationstoafewlinesofcode.Iwasexcitedtotrymyhandatprogramminginawk.Alas,theawkonmycomputerwasalimitedversionofthelanguagedescribedinthegraybook.Idiscoveredthatmycomputerhad“oldawk”andthebookdescribed“newawk.”Ilearnedthatthiswastypical;theoldversionrefuse
6、dtostepasideorrelinquishitsname.Ifasystemhadanewawk,itwasinvariablycallednawk,andfewsystemshadit.Thebestwaytogetanewawkwastoftpthesourcecodeforgawkfromprep.ai.mit.edu.gawkwasaversionofnewawkwrittenbyDavidTruemanandArnold,andavailableundertheGNUGeneralPublicLicense.(Inc
7、identally,it’snolongerdifficulttofindanewawk.gawkshipswithGNU/Linux,andyoucandownloadbinariesorsourcecodeforalmostanysystem;mywifeusesgawkonherVMSbox.)MyUnixsystemstartedoutunpluggedfromthewall;itcertainlywasnotpluggedintoanetwork.So,oblivioustotheexistenceofgawkandthe
8、Unixcommunityingeneral,anddesiringanewawk,Iwrotemyown,calledmawk.BeforeIwasfinished,Iknewaboutgawk,butitwastoolatetos
