于是写了个简单的python程序
#! /usr/bin/pythonimport osimport syscmd = "cat /home/zhangj/hosts/* | grep -v BEGIN | grep -v END"def check_dc_line(): has_duplicate = False dc_set = set() for dc_line in os.popen(cmd, 'r').readlines(): dc_token = dc_line.split() dn = dc_token[0] cv = dc_token[1] dc = dn + "," + cv if dc in dc_set: print "duplicate dc found:", dc has_duplicate = True else: dc_set.add(dc) return has_duplicateif not check_dc_line(): print "no duplicate dc"
对于250个文件，共60万行的数据，过滤一遍约1.67秒
有点不甘心这个效率，于是又写了一个同样功能的shell脚本
#! /bin/bashcat /home/zhangj/hosts/* | grep -v BEGIN | grep -v END | awk ' BEGIN { has_duplicate = 0 } { dc = $1","$2; if (dc in dc_set) { print "duplicate dc found", dc has_duplicate = 1 } else { dc_set[dc] = 1 } } END { if (has_duplicate ==0) { print "no duplicate dc found" } }'为了进一步比较，重复了10次实验。
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