常用shell腳本收藏

1.全局替換字符串

new_context=$1

file_path="/test/test.txt"
keyword="my_keyword"

sed -i "s/.*$keyword.*/$new_context/g" $file_path

2.替換指定字符串的下一行內容

#需要匹配的關鍵信息 
find_contest1=$1
#需要替換的內容
new_context=$2

#操作的文件
file_path="/test/test.txt"
#需要替換的內容
keyword="my_keyword"

sed -i "/$find_contest/{n;s/.*$keyword.*/$new_context/;}" $file_path

3. 判斷一個命令的輸出

#!/bin/bash

check_results=`java -version 2>&1`
echo "check java version results are: $check_results"
if [[ $check_results =~ "1.8." ]]
then
    echo "java version is 1.8, it seems not need to install java again."
else
    echo "It is going to install jdk 1.8 version"
fi