date
who
echo
echo one   two three         four   five
mkdir 0917b
cd 0917b
echo xx > file1
ls
ls > foo
cat foo
ls -la >>foo
wc foo
wc -l foo
cp foo foo2
ls
mv foo2 foo3
rm -fr foo2 foo3
cd
pwd
cd 0917b
pwd
cd ..
pwd
tree ~
cd
cp ~/0917b/file1 ~/0917b/file2
ls ~/0917b/

echo john >  ~/0917b/names
echo mary >> ~/0917b/names

echo 187 > ~/0917b/h
echo 160 >>~/0917b/h

paste ~/0917b/names ~/0917b/h > ~/0917b/tog
cat ~/0917b/tog

who > users
wc -l < users
who | wc -l