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该文被密码保护。 阅读全文

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摘要： 转自【http://mp.weixin.qq.com/s?__biz=MjM5MDE0Mjc4MA==&mid=207451012&idx=1&sn=de9fba4eda0f221363b6d5ae54243416&scene=2&from=timeline&isappinstalled=0#rd】... 阅读全文

摘要： 郑重声明：近期发现有人恶意抄袭文章，请坚守底线完整转载文章，尊重知识和他人劳动成果。吕毅，百度公司资深研发工程师，传统的LAMP人。2012年从新浪平台架构部加入百度移动服务事业群组（MSG）某业务线（以下简称“A”）。在百度期间，随着产品线发展和业务上QPS增长，架构设计方面略有所获，对移动端业务... 阅读全文

摘要： 1、建立文件abbr，用以保存目标服务器简称与全称的对应关系，例如：yang@fengtao ~ $ more abbr#productpp1 p1.prodcut1.server.compp2 p2.prodcut1.server.compp3 p3.prodcut1.server.compp4 p4.prodcut1.server.com2、建立可执行文件autologin.sh,例如：yang@fengtao ~ $ more autologin.sh #!/usr/bin/expectset target [lindex $argv 0]spawn ssh $targetexpec.. 阅读全文

摘要： 1、System FunctionYou can use the system built-in function to execute systemcommands. Please note that there is a difference between two waycommunication and system command.In "|&", you can pass the output of any awk command as input to anexternal command, and you can receive the output 阅读全文

摘要： 1、Bit ManipulationJust like C, awk can manipulate bits.AND andOR or XOR xorComplement complLeft Shift lshiftRight Shift rlshiftAwk Example using Bit Functions$ cat bits.awkBEGIN { number1=15 number2=25 print "AND: " and(number1,number2); print "OR: " or(number1,number2) print &qu 阅读全文

摘要： 1、Argument Processing (ARGC, ARGV, ARGIND)The built-in variables we discussed earlier, FS, NFS, RS, NR,FILENAME, OFS, and ORS, are all available on all versions of awk(including nawk, and gawk).• The environment variables discussed in this hack are availableonly on nawk and gawk.• Use ARGC and ARGV 阅读全文