AWK截取字符串
substr(s, a, b)
多列文本中某一列合并成一行
awk ‘{print $2}‘ user1.txt |tr "\n" ","
awk ‘{print $2}‘ user1.txt |sed ‘s/\n/,/g‘
awk ‘{print $2}‘ user1.txt |xargs
vi 删除某行到结尾
:n,.d
统计多少行
wc -l
vi编辑16进制文件
:%!xxd 内容转换成16进制
:%!xxd -r 16进制回转
linux 实用命令
原文：https://www.cnblogs.com/hookjc/p/13178572.html
