triming lines using shell command

[webdev]

Hello, i have a problem and need your help i have a text file generated automatically from a script , but the result in the script is not ordered in a readable way, so i need your help to fix it using a shell command the text file contain data in this way : <div class="codeblock">

[steffidsouza46]

In-place truncation. To truncate the file in-place with sed, you can do the followingeleting line in a shell script file using sed command.