1 If you're interested in helping, here are some tasks that we've considered
2 over the years. Beware: some are quite old and no longer valid. To avoid
3 wasting your time by duplicating work or by working on a task that is no
4 longer pertinent, please search the mailing list and post your intent
5 before embarking on a big project.
7 ==================================================
8 Modify chmod so that it does not change an inode's st_ctime
9 when the selected operation would have no other effect.
10 First suggested by Hans Ecke <http://hans.ecke.ws> in
11 http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/2920
12 Discussed more recently on <http://bugs.debian.org/497514>.
14 document the following in coreutils.texi:
18 Also document the SELinux changes.
20 Suggestion from Paul Eggert:
21 More generally, there's not that much use for imaxtostr nowadays,
22 since the inttypes module and newer versions of gettext allow things
23 like _("truncating %s at %" PRIdMAX " bytes") to work portably.
24 I suspect that (if someone cares to take the time) we can remove
25 all instances of imaxtostr and umaxtostr in coreutils and gnulib.
27 cp --recursive: use fts and *at functions to perform directory traversals
28 in source and destination hierarchy rather than forming full file names.
29 The latter (current) approach fails unnecessarily when the names
30 become very long, and requires space and time that is quadratic in the
31 depth of the hierarchy. [Bo Borgerson is working on this]
34 Now that gnulib supports *printf("%a"), import one of the
35 *printf-posix modules so that printf(1) will support %a even on
36 platforms where the native *printf(3) is deficient.
37 Suggestion from Eric Blake.
40 Implement the options -P and -L in a POSIX-compatible way.
41 Note the instructions in the initial paragraph of this file
44 renice: POSIX utility, needs implementing.
45 suggestion from Karl Berry (among others).
46 Bob Proulx is working on this.
49 Address this comment: FIXME: mv's behavior in this case is system-dependent
50 Better still: fix the code so it's *not* system-dependent.
52 ls: add --format=FORMAT option that controls how each line is printed.
54 cp --no-preserve=X should not attempt to preserve attribute X
55 reported by Andreas Schwab
57 copy.c: Address the FIXME-maybe comment in copy_internal.
58 And once that's done, add an exclusion so that `cp --link'
59 no longer incurs the overhead of saving src. dev/ino and dest. filename
62 Write an autoconf test to work around build failure in HPUX's 64-bit mode.
63 See notes in README -- and remove them once there's a work-around.
65 Integrate use of sendfile, suggested here:
66 http://mail.gnu.org/archive/html/bug-fileutils/2003-03/msg00030.html
67 I don't plan to do that, since a few tests demonstrate no significant benefit.
69 Should printf '\0123' print "\n3"?
70 per report from TAKAI Kousuke on Mar 27
71 http://mail.gnu.org/archive/html/bug-coreutils/2003-03/index.html
73 printf: consider adapting builtins/printf.def from bash
75 tail: don't use xlseek; it *exits*.
76 Instead, maybe use a macro and return nonzero.
78 tr: support nontrivial equivalence classes, e.g. [=e=] with LC_COLLATE=fr_FR
80 lib/strftime.c: Since %N is the only format that we need but that
81 glibc's strftime doesn't support, consider using a wrapper that
82 would expand /%(-_)?\d*N/ to the desired string and then pass the
83 resulting string to glibc's strftime.
85 unexpand: [http://www.opengroup.org/onlinepubs/007908799/xcu/unexpand.html]
86 printf 'x\t \t y\n'|unexpand -t 8,9 should print its input, unmodified.
87 printf 'x\t \t y\n'|unexpand -t 5,8 should print "x\ty\n"
89 Let GNU su use the `wheel' group if appropriate.
90 (there are a couple patches, already)
92 sort: Investigate better sorting algorithms; see Knuth vol. 3.
94 We tried list merge sort, but it was about 50% slower than the
95 recursive algorithm currently used by sortlines, and it used more
96 comparisons. We're not sure why this was, as the theory suggests it
97 should do fewer comparisons, so perhaps this should be revisited.
98 List merge sort was implemented in the style of Knuth algorithm
99 5.2.4L, with the optimization suggested by exercise 5.2.4-22. The
100 test case was 140,213,394 bytes, 426,4424 lines, text taken from the
101 GCC 3.3 distribution, sort.c compiled with GCC 2.95.4 and running on
102 Debian 3.0r1 GNU/Linux, 2.4GHz Pentium 4, single pass with no
103 temporary files and plenty of RAM.
105 Since comparisons seem to be the bottleneck, perhaps the best
106 algorithm to try next should be merge insertion. See Knuth section
107 5.3.1, who credits Lester Ford, Jr. and Selmer Johnson, American
108 Mathematical Monthly 66 (1959), 387-389.
110 shred: Update shred as described here to conform to DoD 5220 rules:
111 http://lists.gnu.org/archive/html/bug-coreutils/2007-05/msg00075.html
113 Remove suspicious uses of alloca (ones that may allocate more than
116 Adapt these contribution guidelines for coreutils:
117 http://sources.redhat.com/automake/contribute.html
119 Improve test coverage.
120 See HACKING for instructions on generating an html test coverage report.
121 Find a program that has poor coverage and improve.
123 Changes expected to go in, someday.
124 ======================================
126 dd patch from Olivier Delhomme
128 test/mv/*: clean up $other_partition_tmpdir in all cases
130 ls: when both -l and --dereference-command-line-symlink-to-dir are
131 specified, consider whether to let the latter select whether to
132 dereference command line symlinks to directories. Since -l has
133 an implicit --NO-dereference-command-line-symlink-to-dir meaning.
134 Pointed out by Karl Berry.
136 dd: consider adding an option to suppress `bytes/block read/written'
137 output to stderr. Suggested here:
138 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=165045
140 Pending copyright papers:
141 ------------------------
142 getpwnam from Bruce Korb
144 pb (progress bar) from Miika Pekkarinen
146 ------------------------------
148 Remove long-deprecated options. Search case-insensitive for
149 `deprecated' and `remove in '. Automate this.
151 Add a distcheck-time test to ensure that every distributed
152 file is either read-only(indicating generated) or is
153 version-controlled and up to date.
155 remove `%s' notation (now that they're all gone, add a maint.mk sc_
156 rule to ensure no new ones are added):
157 grep -E "\`%.{,4}s'" src/*.c
159 remove all uses of the `register' keyword: Done. add a maint.mk rule
162 remove or adjust chown's --changes option, since it
163 can't always do what it currently says it does.
165 Support arbitrary-precision arithmetic in those tools for which it
166 makes sense. Factor and expr already support this via libgmp.
167 The "test" program is covered via its string-based comparison of
168 integers. To be converted: seq.
170 Adapt tools like wc, tr, fmt, etc. (most of the textutils) to be
171 multibyte aware. The problem is that I want to avoid duplicating
172 significant blocks of logic, yet I also want to incur only minimal
173 (preferably `no') cost when operating in single-byte mode.
175 pr's use of nstrftime can make it malloc a very large (up to SIZE_MAX) buffer
179 Copyright (C) 2002-2009 Free Software Foundation, Inc.
181 This program is free software: you can redistribute it and/or modify
182 it under the terms of the GNU General Public License as published by
183 the Free Software Foundation, either version 3 of the License, or
184 (at your option) any later version.
186 This program is distributed in the hope that it will be useful,
187 but WITHOUT ANY WARRANTY; without even the implied warranty of
188 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
189 GNU General Public License for more details.
191 You should have received a copy of the GNU General Public License
192 along with this program. If not, see <http://www.gnu.org/licenses/>.