./command

passwd

ls
rm -r directorytodelete
rm -r -f directorytodelete
chmod -R 744 directorytoapply

du -hd1

env
for bash: export <name>=<value>
for csh:  setenv <name> <value>

lpoptions -d
lpstat -p [-d]

ps
nohup
command &    --- run command in background

source bashscript &

dd bs=1 skip=60 count=12 if=inputfile of=outputfile     --- extract 12 bytes starting from 61st byte

nice

module av