Program Description
at execute command at specified time at 3am <commands
bc calculator
cmp determine if two files have exact same contents
du -sh * list directory contents and their sizes
diff you know files are different; how do they differ?
grep grep ‘pattern’ file
ls -u (used) -t (MRU) -r (reverse)
nohup nohup command & run command even on logout
sort -r (reverse) -n (numeric) -f (fold upper/lower), +n (start at n+1)
units unit converter
wait waits until all processes initiated with ‘&’ have finished
wc word count -> lines, words, bytes