Inside a folder you can list all the files that the folder contains using the ls command:

ls

If you add a folder name or path, it will print that folder contents:

ls /bin

ls accepts a lot of options. One of my favorite options combinations is -al. Try it:

ls -al /bin

compared to the plain ls, this returns much more information.

You have, from left to right:

• the file permissions (and if your system supports ACLs, you get an ACL flag as well)
• the number of links to that file
• the owner of the file
• the group of the file
• the file size in bytes
• the file modified datetime
• the file name

This set of data is generated by the l option. The a option instead also shows the hidden files.

Hidden files are files that start with a dot (.).

This command works on Linux, macOS, WSL, and anywhere you have a UNIX environment