linux - 编辑不带临时文件的配置文件

Question

我正在尝试编写一个简单的脚本来在文件顶部添加一些配置，这就是我这样做的方式:

 #! /bin/bash

 sudo apt-get install monit
 # BELOW IS THE CODE THAT I'M INTERESTING TO CHANGE 
 echo '
 set eventqueue basedir /etc/monit/eventqueue/ slots 1000
 set mmonit http://monit:monit@xxx.xxx.xxx.xxx:8080/collector
 set httpd port 2812 and use address ec2-xxx.xxx.xx.xx.com 
     allow localhost
     allow 0.0.0.0/0.0.0.0
     allow admin:swordfish
 ' | sudo tee -a /etc/monit/monitrc_tmp
sudo cat /etc/monit/monitrc >> /etc/monit/monitrc_tmp
sudo rm /etc/monit/monitrc
sudo mv /etc/monit/monitrc_tmp /etc/monit/monitrc
# UP TO THIS POINT
sudo sed -i 's/set daemon 120/set daemon 20/' /etc/monit/monitrc
exit 0

如您所见，我正在尝试在文件顶部添加一些配置。只是想知道是否有任何 flag 或 command 可以帮助我在不创建 tmp 文件的情况下执行此操作。

Answer 1

看起来像 sed -i 因为你在 Linux 上。另外，由于这是系统管理工作，请保留备份。

sudo sed -i.bak -e '1i\
set eventqueue basedir /etc/monit/eventqueue/ slots 1000\
set mmonit http://monit:monit@xxx.xxx.xxx.xxx:8080/collector\
set httpd port 2812 and use address ec2-xxx.xxx.xx.xx.com\
    allow localhost\
    allow 0.0.0.0/0.0.0.0\
    allow admin:swordfish
' /etc/monit/monitrc

这表示“在第 1 行之前插入以下行”...这些行会一直持续到并包括末尾没有反斜杠的行。

您也可以编辑 set daemon 行，即使您说它超出范围:

sudo sed -i.bak -e '1i\
set eventqueue basedir /etc/monit/eventqueue/ slots 1000\
set mmonit http://monit:monit@xxx.xxx.xxx.xxx:8080/collector\
set httpd port 2812 and use address ec2-xxx.xxx.xx.xx.com\
    allow localhost\
    allow 0.0.0.0/0.0.0.0\
    allow admin:swordfish
s/set daemon 120/set daemon 20/
' /etc/monit/monitrc