basic command line

# disk free
df -h

# free memory
free -m

# unblock from firewall
nano /etc/csf/csf.deny  # find ip and comment out
csf -r

# recursively download a dir via ftp
wget -r ftp://user:pass@server.com/

# transfer dirs over ssh
scp (see tutorials)

# show processes, kill a specific process
ps aux
kill <pid>

# directory sizes
du -h --max-depth=1 . | sort -n -r

# find big files
find /etc -size +100k -size -150k

# search and replace over dirs
sed -r 's/thisip/thatip/g'
find ./ -type f -exec sed -i 's/apple/orange/g' {} \;


# fix locales
sudo dpkg-reconfigure locales

# rsync (from remote server)
rsync -avz thegeekstuff@192.168.200.10:/var/lib/rpm /root/temp

#some permission stuff from https://wiki.archlinux.org/index.php/Chmod

# hit directories (recursively) in a folder "/" after directory is IMPORTANT
find directory/ -type d -print0 | xargs -0 chmod 755

# hit files (recursively) in a folder "/" after directory is IMPORTANT
find directory/ -type f -print0 | xargs -0 chmod 644