linux - Edit a configuration file w/o temp files -

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i'm trying write simple script add configuration @ top of of file, , that's how this:

 #! /bin/bash   sudo apt-get install monit  # below code i'm interesting 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 , 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 # point sudo sed -i 's/set daemon 120/set daemon 20/' /etc/monit/monitrc exit 0

as can see 'm trying add configuration @ top of file. , want know there flag or command me without creating tmp file.

looks case sed -i since you're on linux. also, since system administration work, preserve backup.

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 , 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

this says 'insert following lines before line 1'...and lines continue , including 1 without backslash @ end.

you can edit of set daemon line too, though said out-of-scope:

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 , 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

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