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From Bash to Z Shell: Conquering the Command Line by Peter Stephenson, Jerry Peek, Oliver Kiddle

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APPENDIX CGlossary

argument These are the strings you type after a program name. Sometimes people distinguish between arguments and options (in the first sense of the two meanings of option that we describe in the glossary) to a program.
array A type of shell variable that contains an ordered list of string values, called elements of the array. The shell provides syntax for you to extract or edit the individual elements.
associative array A type of shell variable that contains a set of key and value pairs, both of which are strings. Using the key, you can extract the corresponding value from the associative array.
binding See key binding.
buffer Any area of computer memory used for temporary storage. In particular, the line editor ...

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