Linux

Directory listing:
ls
Directory listing with subdirectories
ls -R
Information of the files
ls -al
Listing hidden files
ls -a

Creating & viewing files
cat > filename

deleting files
rm filename

Moving files
mv filename new_file_location

Re-naming files
mv filename newfilename

creating directories
mkdir directoryname
mkdir /tmp/music

removing directories
rmdir directoryname

Renaming Directory
mv directoryname newdirectoryname


Installing Software
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade