Your in-class notes go here - take notes in class!Index
- Put your Name and contact information on your laptop.
- Put your Name and contact information on your power cable.
- Put your Name and contact information on your external drive.
- Put your Name and contact information on everything.
- Never use the userids
abcd0001 or abcd1234. These are example userids used in the notes that are meant to be replaced with your own userid. If you try repeatedly to log in to the Course Linux Server from home using these non-existent userids, your home IP address will be locked out for a day or two.
- Incorrect login userid
abcd0001 used into the Course Linux Server causes IP lock-out:
Failed password for invalid user abcd0001 from 74.58.184.3 port 36326 ssh2
refused connect from modemcable003.184-58-74.mc.videotron.ca (74.58.184.3)
- Example advanced sysadmin command pipelines for “Find students with more than five logins and pretty-print with a nice header”:
$ last | awk '{print $1}' | sort | uniq -c | sort -n \
| grep -v -e 'idallen' -e 'cst8207a' -e 'reboot' -e 'ubuntu' -e 'wtmp' -e '^ *[1-5] ' \
| pr -2 -f -h "more than 5 logins"
$ last | awk '$1 ~ /^[a-z][a-z][a-z0-9][a-z0-9][0-9][0-9][0-9][0-9]$/ {print $1}' \
| sort | uniq -c | sort -n | grep -v -e '^ *[1-5] ' | pr -2 -f -h "more than 5 logins"
Author:
| Ian! D. Allen - idallen@idallen.ca - Ottawa, Ontario, Canada
| Home Page: http://idallen.com/ Contact Improv: http://contactimprov.ca/
| College professor (Free/Libre GNU+Linux) at: http://teaching.idallen.com/
| Defend digital freedom: http://eff.org/ and have fun: http://fools.ca/
Plain Text - plain text version of this page in Pandoc Markdown format
