Which new features in ksh-93 are not in bash, and which are?

Which new features in ksh-93 are not in bash, and which are? 


New things in ksh-93 not in bash-2.05a:

	associative arrays

	floating point arithmetic and variables

	math library functions

	${!name[sub]} name of subscript for associative array

	`.' is allowed in variable names to create a hierarchical namespace

	more extensive compound assignment syntax

	discipline functions

	`sleep' and `getconf' builtins (bash has loadable versions)

	typeset -n and `nameref' variables

	KEYBD trap

	variables: .sh.edchar, .sh.edmode, .sh.edcol, .sh.edtext, .sh.version,

		   .sh.name, .sh.subscript, .sh.value, .sh.match, HISTEDIT

	backreferences in pattern matching (\N)

	`&' operator in pattern lists for matching

	print -f (bash uses printf)

	`fc' has been renamed to `hist'

	`.' can execute shell functions

	exit statuses between 0 and 255

	set -o pipefail

	`+=' variable assignment operator

	TMOUT is default timeout for `read' and `select'

	<&N- and >&N- redirections (combination dup and close)

	FPATH and PATH mixing

	getopts -a

	-I invocation option

	DEBUG trap now executed before each simple command, instead of after

	printf %H, %P, %T, %Z modifiers, output base for %d



New things in ksh-93 present in bash-2.05a:

        for (( expr1; expr2; expr3 )) ; do list; done - arithmetic for command

        ?:, ++, --, `expr1 , expr2' arithmetic operators

	expansions: ${!param}, ${param:offset[:len]}, ${param/pat[/str]},

		    ${!param*}

	compound array assignment

	the `!' reserved word

	loadable builtins -- but ksh uses `builtin' while bash uses `enable'

	`command', `builtin', `disown' builtins

	new $'...' and $"..." quoting

	FIGNORE (but bash uses GLOBIGNORE), HISTCMD

	set -o notify/-C

	changes to kill builtin

	read -A (bash uses read -a)

        read -t/-d

	trap -p

	exec -c/-a

	`.' restores the positional parameters when it completes

	POSIX.2 `test'

	umask -S

	unalias -a

	command and arithmetic substitution performed on PS1, PS4, and ENV

	command name completion

	ENV processed only for interactive shells



Section D:  Why does bash do some things differently than other Unix shells?

Home FAQ