You can use the ls command to list items in Linux.

To list content of the current directory, use ls:

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ls

To list content in a specific directory, pass the directory name as an argument:

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ls <directory_name>

To list the content of the directory along with the details of the files, use the -l flag:

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ls -l <directory_name>

For more options, you can read the manual page of ls using man ls:

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man ls

Linux is an open-source operating system that is widely used in computer systems. It provides a platform for running various software applications and is known for its stability, security, and flexibility. Linux is based on the Unix operating system and was developed by Linus Torvalds. It is used in a wide range of devices, from servers to smartphones, and has a large community of developers who contribute to its ongoing development and improvement. Here is the link to learn more about Linux: https://www.linux.org/

In Linux, the cron job for backing up the /var/log/auth.log file could look like this:

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0 1 * * * /bin/cp -p /var/log/auth.log /root/auth-log-backup/

This cron job will copy the /var/log/auth.log file to the /root/auth-log-backup directory every morning at 1AM.