ls -a
alias
nano .bashrc
attu
cp file1.txt file2.txt 
cat file2.txt 
man cp
cat > file2.txt
cat file2.txt
cp file1.txt file2.txt 
cat file2.txt
source .bashrc
alias
ls -l file1.txt 
chmod 777 file1.txt 
ls -l file1.txt 
chmod 000 file1.txt 
ls -l
cat file1.txt 
nano file1.txt 
rm file1.txt 
chmod 000 file2.txt
ls -l file2.txt 
chmod 600 file2.txt 
ls -l
umask
chmod og+w file1.txt 
ls -l file1.txt 
scp file1.txt jessica@barb.cs.washington.edu:/cse/www/education/courses/390a/11wi