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Russ Cox 6c17f63090 mk: treat X= as empty list in rc shell 
This brings mk's behavior when using rc in line with Plan 9's.
The existing code is for Unix environment data structures but
also was assuming Unix shell semantics where empty and missing
variables are mostly equivalent.

The Plan 9 code (/sys/src/cmd/mk/plan9.c in the distribution)
explicitly removes /env/name (creating an empty list) when the
value is missing or an empty string.

Fixes #255.
2020-01-13 19:20:34 -05:00
acid merge 2012-03-05 16:36:31 -05:00
bin wintext: add tmux support, use in ", "" 2020-01-13 11:11:14 -05:00
dict all: remove .cvsignore files 2017-09-14 17:25:17 +02:00
dist src: mv ../buildEnvironmentVariables mkhdr 2020-01-09 20:08:10 -05:00
face faces for lp. 2005-09-13 01:24:50 +00:00
font font: s/10/11 in ascent for unicode.7x13.font 2016-04-18 18:07:22 +00:00
include libdraw: connect to devdraw via $wsysid when set 2020-01-13 16:46:14 -05:00
lib fortunes: correct a mispelling (#234) 2019-04-05 14:47:55 -04:00
lp all: remove .cvsignore files 2017-09-14 17:25:17 +02:00
mac mac/9term.app: invoke 9term with -l 2018-11-14 00:13:01 -05:00
mail all: remove .cvsignore files 2017-09-14 17:25:17 +02:00
man clock: import from plan 9 2020-01-13 16:53:30 -05:00
ndb ndb/local: remove rsc-specific entries (oops) 2008-06-04 13:28:05 -04:00
news odds and ends 2004-04-21 23:43:46 +00:00
plumb plumb/basic: avoid wrap around in file:1:2 (#158) 2018-11-13 23:59:04 -05:00
postscript all: remove .cvsignore files 2017-09-14 17:25:17 +02:00
proto forgotten files 2005-01-13 04:56:07 +00:00
sky all: remove .cvsignore files 2017-09-14 17:25:17 +02:00
src mk: treat X= as empty list in rc shell 2020-01-13 19:20:34 -05:00
tmac tmac: fix troff -ms .KS after .1C 2020-01-13 18:26:15 -05:00
troff troff: import HB, HI and HX fonts from Plan 9 2017-06-15 19:09:58 +00:00
unix unix: fix for tar on FreeBSD (#202) 2018-11-16 10:14:02 -05:00
.gitignore .gitignore: ignore files created for astro(1) and scat(1) 2018-03-23 11:54:04 +01:00
.travis.yml devdraw: cocoa metal screen updates (#215) 2019-05-17 23:17:44 -04:00
CHANGES CHANGES: add pointer to web version 2008-05-10 13:38:21 -04:00
configure For annoying people like Uriel. 2005-11-25 13:18:11 +00:00
CONTRIBUTING.md codereview: delete, now using GitHub pull requests 2017-09-01 13:25:20 -04:00
CONTRIBUTORS venti: fix venti graph on 64-bit 2017-07-23 11:11:56 +00:00
INSTALL INSTALL, 9c, 9l: improve handling of *BSD (#302) 2020-01-07 14:51:42 -05:00
install.txt install.txt: regenerate (9 man 1 intro >install.txt) 2014-12-02 01:24:34 +00:00
LICENSE allow less restricted use of plan9port-specific code 2009-08-14 21:08:23 -07:00
Makefile For annoying people like Uriel. 2005-11-25 13:18:11 +00:00
rcmain rcmain: use new $termprog variable 2013-08-13 12:46:38 -04:00
README.md TODO: remove, not updated in 15 years 2020-01-13 17:04:06 -05:00

README.md

This is a port of many Plan 9 libraries and programs to Unix.

Installation

To install, run ./INSTALL. It builds mk and then uses mk to run the rest of the installation.

For more details, see install(1), at install.txt in this directory and at https://9fans.github.io/plan9port/man/man1/install.html.

Documentation

See https://9fans.github.io/plan9port/man/ for more documentation. (Documentation is also in this tree, but you need to run a successful install first. After that, "9 man 1 intro".)

Intro(1) contains a list of man pages that describe new features or differences from Plan 9.

Helping out

If you'd like to help out, great!

If you port this code to other architectures, please share your changes so others can benefit.

Git

You can use Git to keep your local copy up-to-date as we make changes and fix bugs. See the git(1) man page here ("9 man git") for details on using Git.

Status

Build Status Coverity Scan Build Status

Contact