pwd
print working directory
where you are
cd
change directory
mkdir
make directory
rmdir
remove directory
rm
remove entries for one or more files
mv
rename a file or move it
ls
list contents of directory
ln
make hard or symbolic links
vim
vim
cat
concatenate and display files
less
browse or page through a text file
set
view user set variables
printenv
print environmental variables
wc
word count
lines words characters
cp
make a copy