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Interesting featured are -l -u options in declare statement (automatic conversion to lower case/upper case).
n. The -p option to `declare' now displays all variable values and attributes (or function values and attributes if used with -f). o. There is a new `compopt' builtin that allows completion functions to modify completion options for existing completions or the completion currently being executed. p. The `read' builtin has a new -i option which inserts text into the reply buffer when using readline. s. Changed format of internal help documentation for all builtins to roughly follow man page format. t. The `help' builtin now has a new -d option, to display a short description, and a -m option, to print help information in a man page-like format. u. There is a new `mapfile' builtin to populate an array with lines from a given file. The name `readarray' is a synonym. w. There is a new shell option: `globstar'. When enabled, the globbing code treats `**' specially -- it matches all directories (and files within them, when appropriate) recursively. x. There is a new shell option: `dirspell'. When enabled, the filename completion code performs spelling correction on directory names during completion. dd. The parser now understands `|&' as a synonym for `2>&1 |', which redirects the standard error for a command through a pipe. ee. The new `;&' case statement action list terminator causes execution to continue with the action associated with the next pattern in the statement rather than terminating the command. hh. There are new case-modifying word expansions: uppercase (^[^]) and lowercase (,[,]). They can work on either the first character or array element, or globally. They accept an optional shell pattern that determines which characters to modify. There is an optionally- configured feature to include capitalization operators. ii. The shell provides associative array variables, with the appropriate support to create, delete, assign values to, and expand them. jj. The `declare' builtin now has new -l (convert value to lowercase upon assignment) and -u (convert value to uppercase upon assignment) options. There is an optionally-configurable -c option to capitalize a value at assignment. kk. There is a new `coproc' reserved word that specifies a coprocess: an asynchronous command run with two pipes connected to the creating shell. Coprocs can be named. The input and output file descriptors and the PID of the coprocess are available to the calling shell in variables with coproc-specific names.
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