shell操作文件的几条命令：删除最后一列、删除第一行、diff等

shell操作文件的几条命令：删除最后一列、删除第一行、diff等

删除文件第一行： sed '1d' filename

删除文件最后一列： awk '{print $NF}' filename

比较文件的两种方法：

1）comm -3 --nocheck-order file1 file2

2) grep -v -f file1 file2 :输出file2中有file1中没有的行

当然还有diff file1 file2

贴一段昨天写的shell脚本~

#!/bin/=` +=` -d +=` +=` + /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/same_similiar_log/ haven
today_input=/home/crawler/petabyte/crawllog/news_data/=/home/crawler/petabyte/crawllog/news_data//opt/hadoop/program/bin/hadoop fs - $yesterday_input/ > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files//opt/hadoop/program/bin/hadoop fs - $today_input/ >> /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/  /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/all_get > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/  /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/all_get_without_first_line > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/- --nocheck-order /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/all_input /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/input_done > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/ -v -f /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/input_done /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/all_input > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/  /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/today_diff > /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/ /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/all_input /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/=
= < /home/spamdetect/changxiaojia/workspace/finance/same_similar_news_mining/mid_files/ $inputfile1