Jan Kończak

1	cat /etc/motd cat /etc/SUSE-brand /etc/os-release
2	cat foo baz # press Ctrl+d
3	cat /usr/share/doc/mpich/user.pdf cat -v /usr/share/doc/mpich/user.pdf
4	paste /etc/os-release /etc/os-release
5	hexdump -C /usr/share/themes/Breeze/assets/line-h.png
11	date > file
12	date >> file
13	cat /etc/motd /etc/shadow 2> file
14	find /var/spool/ 2> /dev/null
15	find /var/spool/ > out 2> err
16	find /var/spool/ &> out_and_err
17	echo 'print("hello " + __file__)' > file python < file # compare with python file
18	hexdump -C << EOF foo baz bar€and®foobar EOF
19	bc sqrt(2.0000) quit bc <<< 'sqrt(2.0000)'
20	bc <<< 'sqrt(2.0000)' > file
21	cat /etc/motd >&- find /var/spool/ 2>&-
22	cp /etc/services . hexdump <>services 1>&0 # hexdump reads a chunk of data, outputs (in the middle of the file) the hex dump, # and repeats this until it processes whole file.
23	cat /etc/motd /etc/shadow 3>&1 1>&2 2>&3 | rev
25	echo '2+2*2' | bc
26	echo 'some text' | xxd
27	ls | cat ls | cat -n
28	ps -eF | fold
29	mkfifo p fold < p ps -eF > p
30	paste <(seq 15) <(seq 15 -1 1) | head -n3 paste <(seq 15) <(seq 15 -1 1) | tail -n3 paste <(seq 15) <(seq 15 -1 1) | head -n -3 paste <(seq 15) <(seq 15 -1 1) | tail -n +4 paste <(seq 15) <(seq 15 -1 1) | head -n9 | tail -n 4
31	seq 25 > file tail -f file seq 26 30 >> file
32	seq 75 | grep 5 seq 75 | grep '5$' seq 75 | egrep '5$|0$' seq 75 | grep -B3 '33' seq 75 | grep -C2 '33'
33	grep 10 /etc/passwd /etc/group grep -R ecdsa ~/.ssh
34	mount | cut -f 5 -d ' ' cut -f 3 -d ' ' /etc/mtab
35	egrep '^[Ee]{2}' /usr/share/myspell/en_US.dic | cut -f1 -d/
37	cat random_data sort random_data
38	sort -k3 random_data sort -nk3 random_data
39	sort -k2,2 -k6,6 random_data
40	sort -k2,2 random_data sort -sk2,2 random_data # the latter preserves order of lines with identical sort key
41	sort -k2,2 -k3,3n random_data
42	man wc | cat man wc | wc
44	perl -e 'printf "%d\n", (int rand(6)+1)+(int rand(6)+1) for(1..100)' | uniq -cd perl -e 'printf "%d\n", (int rand(6)+1)+(int rand(6)+1) for(1..10000)' | sort -n | uniq -c
45	echo -e '1 2 3\n4 5 6\n7 8 9' echo -e '1 2 3\n4 5 6\n7 8 9' | rev echo -e '1 2 3\n4 5 6\n7 8 9' | tac
46	ls -l | tr '0-9' '-' ls -l | tr '[:lower:]' '[:upper:]' # or     ls -l | tr 'a-z' 'A-Z' ls -l | tr -s ' ' ' ' ls -l | tr -d 'rwx'
48	less /usr/share/doc/packages/apparmor-docs/techdoc.pdf less -L /usr/share/doc/packages/apparmor-docs/techdoc.pdf less /usr/share/doc/packages/automake/amhello-1.0.tar.gz less /usr/include
49	tree | tee file less file