How to use grep command for file search and filter for check disk space usage

How to use grep command for file search and filter for check disk space usage

The grep command is often used in combination with other commands to filter and search for specific information. To check disk space usage using grep, you would typically use it in conjunction with a command like df to search for specific filesystems or disks. Here are some examples:

  1. Check all disk space usage:

    To list all mounted filesystems and their disk space usage, you can use the df command and pipe the output to grep to filter specific information. For example, to display all filesystems:

     df -h | grep -E '^Filesystem|/dev/sd'
    

    The grep command with the -E option is used to specify a pattern. This example filters the output to display lines that start with "Filesystem" (the header) and lines related to /dev/sd devices (disk partitions).

  2. Check a specific directory's disk space usage:

    If you want to check the disk space usage for a specific directory, you can use the du (disk usage) command followed by grep to filter the output. For example, to check the disk space usage for the /var directory:

     du -h /var | grep /var
    

    In this case, grep is used to show lines that include /var in the output of du.

Remember that the df command provides an overview of disk space usage for all mounted filesystems, while du is used to check the disk space used by specific directories. Using grep helps you filter and search for specific information within their output.

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