dd: convert and copy a file
ls: list directory contents
intro: Introduction to user commands
df: report filesystem disk space usage
cp: copy files and directories
touch: change file timestamps
rm: remove files or directories
mv: move rename files
du: estimate file space usage
mkfifo: make FIFOs named pipes
ln: make links between files
diff: find differences between two files
mkdir: make directories
mknod: make block or character special files
dircolors: color setup for ls
install: copy files and set attributes
rmdir: remove empty directories
chgrp: change group ownership of files
chmod: change access permissions of files
chown: change file owner and group
dir: list directory contents
vdir: list directory contents
time: time a simple command or give resource usage
zdump: time zone dumper
intro: Introduction to administration and privileged com
zic: time zone compiler
tzselect: select a time zone
sync: synchronize data on disk with memory