Week 9, Intro to Unix lab 2016

29 Apr 2016

Content

Recap of processes subshells {}
- { rm a || rm b ; } || echo failed subshell
basic signalling. See kill -l and previous week 8 for homework.
counter=0; seq 10 | { counter=$(wc -l); echo $counter ; } ; echo parent process counter $counter
ps for printing resources
- ps -a -x -o pid,rss | tail -n +2
We look at some common errors
- http://j2m.cz/~jm/vyuka/unix2016/priklady10.sh
- http://ufal.mff.cuni.cz/~vernerova/2016/docs/cviceni08.txt
- In general try to look also to another lab exercise

In addition to homework from previous week which was announced this Thursday
(1 point) Implement a script which will run forever if not interrupted via Ctrl + C
- If interrupted it will ask you: Do you really want to quit? y/N
- If only enter is pressed it continues
- If y or Y is pressed then it quits
- If n or N is pressed then it continues