vypis logu v realnem case

tail -f /soubor

vyber ze souboru

tail -f /soubor | grep --line-buffered hledaneslovo
tail -f /soubor | stdbuf -o0 grep hledaneslovo

ssh rsa key generovani - nezadavat passphrase
ssh-keygen -t rsa

prekopirovani na server

ssh-copy-id user@ip_srv

server: jako root

ssh-keygen -t rsa

heslo nechame prazdne

scp /root/.ssh/id_rsa.pub uzivatel@nacilovemstroji:/var/tmp/id_rsa.pub.temp

cilovy stroj

mkdir /root/.ssh
touch /root/.ssh/authorized_keys
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
cat /var/tmp/id_rsa.pub.temp >> ~/.ssh/authorized_keys

ln -f -s /home/zdroj /home/symlink

sed -i 's/original/new/g' file.txt
  -i = in-place (i.e. save back to the original file)
  s = the substitute command
  g = global (i.e. replace all and not just the first occurrence)