To securely delete all files on a Linux system hosted on Amazon Web Services (AWS) so that they cannot be recovered, you can use the shred command. shred is a utility that overwrites the data in a file multiple times, making it difficult or impossible to recover the original data.
To use shred, you will need to install it on your system. On most Linux systems, shred is included in the coreutils package, which can be installed using the package manager. For example, on a Debian or Ubuntu system, you can use the apt-get command to install shred:
sudo apt-get install coreutils
On a CentOS or Red Hat system, you can use the yum command to install shred:
sudo yum install coreutils
Once shred is installed, you can use it to securely delete all files in a directory by running the following command:
find /path/to/directory -type f -exec shred -u -z {} +
This will find all files in the /path/to/directory directory, and overwrite the data in each file multiple times using the shred command. The -u option specifies that the file should be deleted after it has been overwritten, and the -z option specifies that the final pass should be filled with zeros.
Note that this process can take some time, depending on the number and size of the files being deleted.
For more information about using shred to securely delete files on a Linux system, you can consult the shred documentation or seek assistance from a qualified Linux administrator.