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Linux Class

Here is a list of ideas for a linux class.

Class 1

Linux basics

  • history, ctrl+r, pressing up in the terminal brings up the previous command.
  • You can use tab to auto-complete anything, filenames, commands, etc.
  • pwd, ls, cd, mkdir, rm, rm -rd, mv, cp
  • man will show you the manual for the program, Google is also your friend.
  • .. is a short command for "up one dir"
  • . is a short command for "current directory"
  • ~ is short for home directory. e.g. /home/cwiggs, or /root
  • almost all commands have switches, or parameters. -r for recursive, -f for force. Not always consistent across programs though.

Homework / Testing

  1. Change into the "~/Downloads" directory.
  2. List the contents of "~/Downloads" directory.
  3. Create a directory called "test_dir1".
  4. Copy "test_dir1" to "test_dir2".
  5. Delete the "test_dir1" directory.
  6. Rename "test_dir2" to "test_dir3".
  7. With 1 command make this directory: "~/Downloads/one/two/three".
  8. With 1 command delete this directory: "~/Downloads/one/two/tree".
  9. Questions, what do you want to learn next.

Brain dump for future classes

Class 2

  • tail, vim, head, cat
  • grep

future classes

  • stderr/stdout/stdin
  • *, &&, !!, ;
  • exit codes, 0 for success, 1 for failure, etc
  • piping commands, tail -f /var/log/syslog | grep ERROR
  • std redirection
  • package managers: apt-get, yum, etc
  • ps, top, lsof?
  • disk, filesystems: df, du, fdisk, dd, mkfs
  • permissions, no 777
  • sed: sed 's/this/that/g'
  • explain dns basics: dig, nslookup, ttl
  • explain IPs, ports: nmap, nc, netstat, tcpdump, ipcalc.
  • explain env vars: $PATH, $PS1?
  • find: `find / -iname "sumologic"
  • vim class: ZZ, :q, :w, :w!, %s/search/replace/g, /search, GG, gg, caw, daw
  • GCP/cloud class: spin up GCP compute always free tier VM using terraform