统计文件中某个单词出现的次数

统计file文件中单词good的个数
1、awk 'BEGIN {num=0} {i=1;while(i<=NF) {if ($i=="good") num++; i++}} END{ print "num="num}'  sed
2、awk -v RS='\\<good\\>' 'END {print --NR}' file
3、sed  's/[^a-zA-Z]/\n/g' file |sort |uniq -c |grep good
4、tr -s "\t| " "\n" <file |sort |uniq -c |grep good
5、sed 's/\t/\n/g;s/ /\n/g' file |sort |uniq -c |grep good