linux

• echo -n - do not output a trailing newline
• _COMMAND_1_; _COMMAND_2_ - sequential/multiple commands
• = in less - show current position in the document
• -N then CR in less - show line numbers
• globbing - pattern matching, not regex; * - any character any number of times; ? - one character; [abc] - a or b or c; [0-9] - digits
• grep -F - normal search, no regex