Linux Filesystem

You will be able to

• Navigate the directory tree with absolute and relative paths, without looking anything up.
• Create, copy, move, link and remove files and directories safely.
• Find what is using disk space and why df and du disagree.
• Attach, inspect and detach filesystems with mount, including loop devices and bind mounts.
• Set ownership and permissions precisely, including umask, setgid and sticky directories.
• Build and verify a shared project area the way an administrator would.

Lessons

1. 01The tree and how to move in itRead the single directory tree, then move through it with absolute and relative paths.pwdlscdreadlinktype0/5 exercises
2. 02Directories: build, reshape, removeCreate whole trees in one command, copy and move them, and remove them without losing anything you meant to keep.mkdirrmdircpmvrmfind0/5 exercises
3. 03Files: create, read, copy, move, removeCreate files, read them without an editor, handle many at once with globs, and avoid the ways these commands destroy data.touchcatlessheadtailwc0/5 exercises
4. 04Inodes, hard links and symbolic linksSee what a file really is on disk, then use links to give one file several names, or a name that points elsewhere.statlnls -ireadlinkfind0/5 exercises
5. 05Disk usage: where the space wentMeasure free space and find what fills it, and learn why df, du and ls report different numbers.dfduls -Sfindsortlsof0/6 exercises
6. 06Mounts: attach and detach filesystemsSee how disks join the tree, then build, mount, remount, bind and unmount filesystems safely on a file-backed disk.findmntlsblkblkidmountumountmkfs.ext40/6 exercises
7. 07Permissions and ownershipRead, set and reason about who can read, change and run each file, including umask and the setuid, setgid and sticky bits.chmodchownchgrpumaskidstat0/6 exercises
8. 08Capstone: a shared project areaCombine ownership, permissions, setgid, sticky bits, usage reports and cleanup to build and audit a shared directory the way an administrator would.useraddusermodgetenttarfinddu0/6 exercises