linux commands (2)

cat /etc/issue   ...return o/s installed

who      ..users logged in and what they're doing
users    ..users logged in
last     ..users who have logged in / out + when last rebooted
lastlog  ..does the same but lists as log
whoami   ..who you're logged in as
sudo passwd [user]  ..change users password

nano [file]  ..nice text editor
gedit .      ..open current dir in gnome editor (note the . )

cat /proc/cpuinfo  ..show cpu info
cat /proc/cpuinfo | grep processor | wc -l  .   ...cpu info + processors
dmidecode | less  ...BIOS info
ethtool -i eth0  ...ethernet adapter hardware info

free -tm           ..shows memory free in mb
top                ..memory usage
uname -options     ..show o/s info
dmesg              ..debug info

chown [user] file/folder  ..change file/folder ownership
chmod -R a+rw public   ...change permissions recursively
which [program]           ..find location of program

sudo aptitude update
sudo aptitude safe-upgrade
sudo aptitude clean

sudo aptitude install [package]
sudo aptitude remove [package]

crontab -e

..start task on reboot without email reporting
@reboot (sh /startup.sh) > /dev/null 2>&1

poweroff   ..shutdown machine
shutdown -r now  ..reboot machine

rm -rf  [dir]  ...remove directory recursively

ls -a  ..show files / dirs inc. hidden files
ls -l  ..show file / dir permissions & sizes

ssh-keygen           ..generate rsa key
ssh-keygen -d        ..generate dsa key
ssh-keygen -f mykey  ..generate named rsa key

chmod -R a+rw public ..make [public] public recursively

lspci | grep VGA  ..show video hardware