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someprog > /dev/null 2>&1 The first part, “> /dev/null” means send standard output to the ‘bit bucket” or in other words, throw it away. The second part, “2>&1” means “redirect standard error...
Dump/image CDROM to ISO file dd if=/dev/cdrom of=/path/til/ISO-fil
Replace all instances of one word with another in a file sed -i 's/ord1/ord2/g' filnavn
Remove comments and blank lines from a file sed -i '/.#/d;/^$/d' filnavn