Roland Mainz's sponsored putback of:
PSARC/2009/063 ksh93 update 2
PSARC/2009/248 ksh93 update to 2009-03-10
PSARC/2009/249 more ksh93 command conversions
will affect two projects:
1. ksh93-integration project:
############################
- ksh93 is updated to ast-ksh.2009-10-14
(a Changelog for ksh93/libshell can be found at
usr/src/lib/libshell/common/RELEASE)
- The following additional builtin commands are now enabled by default
and bound to /usr/bin/
/usr/bin/cksum
/usr/bin/cmp
/usr/bin/comm
/usr/bin/cut
/usr/bin/join
/usr/bin/paste
/usr/bin/tail
- Usability:
- The machine-wide ksh interactive shell startup file
/etc/ksh.kshrc will now enable the "globstar" mode by default
The "globstar" mode (enabled via $ set -o globstar #) causes ** by
itself to also match all sub-directories during pathname expansion.
- The new type system is now considered stable (but not fully ARC'ed yet),
the documentation can be found in /usr/share/doc/ksh/TYPES
- The ksh93 documenation now lives in /usr/share/doc/ksh/
- Demo code/"Easter-eggs":
- ksh93 now contains an experimental version of "grep" which comes in
several flavours and should form the basis for a future version
of POSIX/SUS "grep" (matching /usr/xpg4/bin/grep&co.) with common
GNU+BSD features (including "-r").
- "grep" The default basic regular expressions (no alternations.)
- "egrep" Extended regular expressions (alternations, one or more.)
- "fgrep" Fixed string expressions.
- "pgrep" perl(1) regular expressions (lenient extended.)
- "xgrep" Augmented regular expressions (conjunction, negation.)
The builtin can be accessed like this:
$ builtin grep ; grep --help # enables the "grep" builtin and displays
the builtin help
2. POSIX utility modernisation:
###############################
As part of the POSIX utilty modernisation project the following
utilities are switched from the old Solaris codebase to the AST&T AST
(=Advanced Software Technology) codebase:
/usr/bin/cksum
/usr/bin/cmp
/usr/bin/comm
/usr/bin/cut
/usr/bin/join
/usr/bin/paste
/usr/bin/print
/usr/bin/tee
/usr/bin/uniq
/usr/bin/wc
Notes:
- The new versions of these utilities have common GNU+BSD features, see
PSARC/2009/063 and PSARC/2009/249
- Each utility supports the --help and --man option which can be used
to obtain a short description of the additional features
- The implementation of /usr/bin/cksum will take the specified output
format string "%u %d %s\n" <checksum>, <# of octets>, <path name> now
literally, previously implementation used a <tab> instead of
<space> between %u and %d (the POSIX standard allows both <tab>
and <space>, however GNU and BSD implementations use <space> and
no other implementation except Solaris was found which uses
<tab>). This is not considered an issue of backwards-compatibilty
since the POSIX people invented "cksum" as portable hash sum generator
and any non-standard behaviour defeats the purpose of this utility
(this was explcitly described in PSARC/2009/249).
For futher information see
http://www.opengroup.org/onlinepubs/009695399/utilities/cksum.html
- Design:
- The code for the utilities is shared between ksh93 and the utilities
and lives in libcmd.so.1 to reduce disk footprint.
- The source code for the utilities can be found under
usr/src/lib/libcmd/common/, the entry point can be found at
usr/src/cmd/ksh/builtins/alias.c. This follows the design of
"busybox" in where one executable contains many different utilities
where the physical files in /usr/bin/ are hard-links to the busybox
executable (we call it "alias" in our implementation).
Reporting bugs/problems/rants
#############################
If you encounter any difficulties which you believe may be related to
this putback, please direct all rants/flames in Roland's
(roland.mainz at nrubsig.org) or Olga's (olga.kryzhanovska at gmail.com)
direction, the ksh93-integration mailinglist (see
http://mail.opensolaris.org/mailman/listinfo/ksh93-integration-discuss ;
please subscribe before posting), or http://bugs.opensolaris.org/
(Product/Category/Subcategory "solaris/shell/korn93").
Links
#####
- Project homepage:
http://www.opensolaris.org/os/project/ksh93-integration/
- Project home page can be found at
http://www.opensolaris.org/os/project/ksh93-integration/
- KornShell home page:
http://www.kornshell.com/
- AT&T ast-ksh source packages:
http://www.research.att.com/~gsf/cgi-bin/download.cgi?action=list&name=ast-ksh
- shell project shell script coding guidelines:
http://www.opensolaris.org/os/project/shell/shellstyle/
