Resizing a File in Ubuntu by a Specific Size and Removing Lines From the Center

To resize a file to a specific size and remove lines from the center of the file in Ubuntu, you can use a combination of commands like truncate and head and tail. Here’s how you can achieve this:

1. Resize the File to 10MB using truncate:

   To resize a file to a specific size, you can use the truncate command with the --size (-s) option. In this case, we want to resize the file other_vhosts_access.log to 10MB:

   1	truncate --size 10M other_vhosts_access.log

   This command will resize the file other_vhosts_access.log to exactly 10 megabytes. If the file was larger than 10MB, it will be truncated, and if it was smaller, it will be padded with null bytes.

2. Remove Lines from the Center of the File:

   To remove lines from the center of a file, you can use a combination of head and tail commands. For example, if you want to remove lines from the center of the file, leaving only the first 1000 lines and the last 1000 lines, you can do the following:

   1 2 3

   head -n 1000 other_vhosts_access.log > temp.log tail -n 1000 other_vhosts_access.log >> temp.log mv temp.log other_vhosts_access.log

   Here’s what each command does:

   • head -n 1000 other_vhosts_access.log: This command extracts the first 1000 lines of the original file and redirects them to a temporary file called temp.log.

   • tail -n 1000 other_vhosts_access.log: This command extracts the last 1000 lines of the original file and appends them to the temp.log file.

   • mv temp.log other_vhosts_access.log: Finally, this command renames temp.log to other_vhosts_access.log, effectively replacing the original file with the modified one.

This sequence of commands will resize the file to 10MB and remove lines from the center, leaving only the first and last 1000 lines in the other_vhosts_access.log file.