cat .ssh/id_rsa.pub | ssh 111.122.1.98 "cd;mkdir .ssh;cat >> .ssh/authorized_keys; chmod 600 .ssh/authorized_keys"

find . -type f -print0|xargs -0 ls -s1|sort -rn|head

tr -cs "[:alpha:]" "\n" < bool2.pl |tail -10

modprobe -r pcspkr ---switch off pc speaker

vim: %&g --repeat last substitution everywhere in the file

dmesg|dd -conv ucase

vim: :s ---repeat last substitution. Or simply &

tar cf - old-dir |(cd new-dir; cd ..; tar xvpf -)

vim: :%s/Intel/\U&/gc

vi: %s/^=.*=/=&=/gc ----lowers all headers level in wikipedia by one.

ex: 3,8s/.*/(&)

tar xvf my.tar `tar tf my.tar|grep 'pattern';sleep 60`

:%s/\(abcd)\1/alphabet-soup/ ----changes 'abcdabcd' into 'alphabet-soup'

ex: :s/End.*/End ---removes all characters on the line after 'End'

cd; find . -print|tar cvf /dev/rmt/0cbn -T -

vim: :g/3/s/line/LINE/gc ---on lines containing '3' substitute 'line' by 'LINE'

screen -D -R

cat /proc/cmdline ---shows parameteres passed to the kernel during boot

man 7 signal

ex: 164,220 ya a ---yank lines 164 through 220 into buffer a. pu a ----put buffer a.

vim: % refers to the current filename, # - to the alternate filename. :w %.new ^^

vim: :e! ---discard edits and return to the saved version of the current file.

find . -print|cpio -oacvB|(ssh myhost dd of=backup.file bs=5120

dmesg|grep cpu. -io

vim: :args :last :rewind

dpkg -iG foo ---G says not to proceed if a newer package is already installed.

ext: tune2fs -l /dev/hda2

vim: :0r foo.txt :$r foo.txt :$185 foo.txt :/pattern/r foo.txt ---place contents of foo.txt in the beggining, end, after line 185 or after first linke with 'pattern' accordingly.

`usermod -L` locks the user, `usermod -U` unlocks

gpg --keyserver=x-hkp://pgp.mit.edu --send-keys e4eac24b

df . ---quickly determine what filesystem the current directory is in.

virtualization-capable CPU (/proc/cpuinfo) must have a flag SVM (for AMD) or VMX (for Intel)

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