bash shell redirecting code block

参考了：https://www.cnblogs.com/sparkdev/p/10247187.html

https://www.tldp.org/LDP/abs/html/redircb.html

 

awk 用法（使用入门）

 

awk 用法：awk ' pattern {action} '  

 

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#!/bin/bash   E_WRONG_ARGS=71 if [ -z "$1" ] then     echo "Usage: $0 input-file output-file"     exit $E_WRONG_ARGS fi   if [ -z "$2" ] then     echo "Usage: $0 input-file output-file"     exit $E_WRONG_ARGS fi   FinalName="xxyy" line_count=$(wc "$1" | awk '{ print $1 }')   for name in $(seq $line_count) do     read name     echo "$name"     if [ "$name" = "$FinalName" ]     then         break     fi done  < $1 > $2 exit 0