List of Linux command and most cases

This is work in progress.

Modules:

apt-get install package_name – debian based package manager
cat _file_ – display file content
dmesg – print or control the kernel ring buffer
ifconfig – tool for configure network card 
ls – list current directory
lsmod – list modules inserted into the kernel
pwd – display current path
yum – package manager for RedHat based system
vi _file_ – Vim editor 

Full Linux directory explanations

/bin/ -> (usr/bin) – executable programs
/dev/
/etc/ – config files
/etc/modules – file containing modules at boot time
/etc/modprobe.d/ – confg files for modules
/home/ – user folder directories
/lib/
/lib64/
/media/
/mnt/ – mount points for file systems
/opt/
/proc/
/root/ – root home directory
/run/
/sbin/
/srv/
/sys/
/tmp/
/usr/
/var/