ll

Gives a directory listing of files and subdirectories in the current or specified directory

cd subdirectory name

Changes current subdirectory to specified directory

pwd

Displays your present (current) working directory

mkdir subdirectory name

Creates a new subdirectory

rmdir subdirectory name

Removes or deletes a subdirectory

cp source path and filename
target path and filename

Copies an existing file to a new file or new location

mv source path and filename target path and filename

Moves an existing file to a new file or new location

rm source path and filename

Removes or deletes specified file

chmod u, g, o, a/+, -/r, w, x subdirectory or filename

Changes a group's (u=user, g=group, o=other, or a=all) permissions (r=read, w=write, and x=execute) on specified subdirectory or filename