man man
man ssh
man pwd
pwd

mkdir zoo
mkdir /home/user/zoo (absoluut pad)
mkdir ~/zoo (absoluut pad)
cd zoo
cd /home/user/zoo (absoluut pad)
mkdir zeedieren waterdieren zoogdieren knaagdieren
cd zeedieren
pwd
touch dolfijn zeester goudvis
ls
cd .. 
cd /home/user/zoo (absoluut pad)
ln -s zeedieren/dolfijn zoogdieren/dolfijn
rm -r waterdieren
cd waterdieren
mv zeester zee-ster
cd
cp zoo/zeedieren/goudvis zoo/zeedieren/tweede_goudvis

fortune
cowsay
fortune | cowsay

ls -l
cat .link
(output: ftp://ita.ee.lbl.gov/traces/NASA_access_log_Jul95.gz)
cat .link | xargs wget
gunzip NASA_access_log_Jul95.gz
cat NASA_acces_log_Jul95 | head
cat NASA_acces_log_Jul95 | tail
less NASA_acces_log_Jul95

find -iname text.txt

wc favoriete_kleuren.txt
wc -w favoriete_kleuren.txt
wc -c favoriete_kleuren.txt
wc -l favoriete_kleuren.txt

uniq Favorite_colours
uniq Favorite_colours.txt New_Favorite_colours.txt

cut -f 2 -d ' ' New_Favorite_colours.txt

sort New_Favorite_colours.txt

pipes:
> : Save output to a file.
>> : Append output to a file.
< : Read input from a file.
2> : Redirect error messages.
| : Send the output from one program as input 	to another program.

voorbeelden met pipes:
cut -f 2 -d ' ' New_Favorite_colours.txt > names.txt
sort < names.txt
sort < names.txt > sorted_names.txt

cut -f 2 -d ' ' New_Favorite_colours.txt | sort
cut -f 2 -d ' ' New_Favorite_colours.txt | sort > sorted_names2.txt
	
grep Groen New_Favorite_colours.txt 	
grep '[a-z] G' New_Favorite_colours.txt

sed s/groen/wit/g New_Favorite_colours.txt 	

ps aux | grep ...

top
htop

tar
unzip

dtrx

ls -l chown -x zoo cd zoo (> permission denied) sudo ... sudo !! su other_user

http://www.ostera.io/tldr.js/
http://explainshell.com/
