On Wednesday 07 January 2009 17:08:04 Jim Meyering wrote:
> --no-clobber gets a few more matches in C sources than --no-overwrite,
>
> 57 http://www.google.com/codesearch?q=\-\-no\-clobber+lang:c
> 40 http://www.google.com/codesearch?q=\-\-no\-overwrite+lang:c
>
> Regarding uses, it appears to outnumber --no-overwrite 2-to-1.
>
> Anyone else have a preference?
Now the option is --no-clobber in attached patch. Anyway the change is
trivial. No problem to change it if there will be a consensus
for --no-overwrite or something else.
> My point is that depending on when you test for
> the existence of the destination file, you could say that with
> --backup, there is never an existing destination file, since
> it's always moved aside before the "open". In *that* case,
> you would expect the "-n" in "--backup -n" to be ignored.
> This ambiguity is why the semantics of "--backup -n" must be
> documented explicitly.
Ok, mentioned in documentation of option -n.
> Since there are three copies of that new sentence in coreutils.texi,
>
> If you specify more than one of the @option{-i}, @option{-f},
> @option{-n} options, only the final one takes effect.
>
> would you please put it in a macro?
Ok, new patch attached.
Kamil
From 7e3be3500d0a7c27331131115158d608bca53ed7 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <[email protected]>
Date: Wed, 7 Jan 2009 19:52:28 +0100
Subject: [PATCH] cp/mv: add --no-clobber (-n) option to not overwrite target
* src/cp.c (usage): Show new option -n in --help.
(main): Handle new option -n.
* src/mv.c (usage): Show new option -n in --help.
(main): Handle new option -n.
* doc/coreutils.texi: Document new cp/mv option -n.
* tests/cp/cp-i: Add tests for -f, -i and -n options.
* tests/mv/mv-n: New test for mv -n.
* tests/Makefile.am: Add test mv/mv-n to the list.
* NEWS: Mention the change.
---
NEWS | 3 ++
doc/coreutils.texi | 28 ++++++++++++++++++++++++-
src/cp.c | 15 ++++++++++--
src/mv.c | 15 ++++++++++--
tests/Makefile.am | 1 +
tests/cp/cp-i | 33 +++++++++++++++++++++++++++++
tests/mv/mv-n | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 146 insertions(+), 7 deletions(-)
create mode 100755 tests/mv/mv-n
diff --git a/NEWS b/NEWS
index f605330..f1b383e 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,9 @@ GNU coreutils NEWS -*- outline -*-
** New features
+ cp and mv accept a new option, --no-clobber (-n): silently refrain
+ from overwriting any existing destination file
+
dd accepts iflag=cio and oflag=cio to open the file in CIO (concurrent I/O)
mode where this feature is available.
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 51145de..ee5e85e 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -7314,6 +7314,9 @@ description of @option{--remove-destination}.
This option is independent of the @option{--interactive} or
@option{-i} option: neither cancels the effect of the other.
+This option is redundant if the @option{--no-clobber} or @option{-n} option is
+used.
+
@item -H
@opindex -H
If a command line argument specifies a symbolic link, then copy the
@@ -7326,7 +7329,8 @@ via recursive traversal.
@opindex -i
@opindex --interactive
When copying a file other than a directory, prompt whether to
-overwrite an existing destination file.
+overwrite an existing destination file. The @option{-i} option overrides
+a previous @option{-n} option.
@item -l
@itemx --link
@@ -7340,6 +7344,13 @@ Make hard links instead of copies of non-directories.
@opindex --dereference
Follow symbolic links when copying from them.
+...@item -n
+...@itemx --no-clobber
+...@opindex -n
+...@opindex --no-clobber
+Do not overwrite an existing file. The @option{-n} option overrides a previous
+...@option{-i} option. This option turns off the backup.
+
@item -P
@itemx --no-dereference
@opindex -P
@@ -8099,6 +8110,11 @@ The program accepts the following options. Also see @ref{Common options}.
@opindex --force
@cindex prompts, omitting
Do not prompt the user before removing a destination file.
+...@macro mvOptsIfn
+If you specify more than one of the @option{-i}, @option{-f}, @option{-n}
+options, only the final one takes effect.
+...@end macro
+...@mvoptsifn
@item -i
@itemx --interactive
@@ -8108,6 +8124,16 @@ Do not prompt the user before removing a destination file.
Prompt whether to overwrite each existing destination file, regardless
of its permissions.
If the response is not affirmative, the file is skipped.
+...@mvoptsifn
+
+...@item -n
+...@itemx --no-clobber
+...@opindex -n
+...@opindex --no-clobber
+...@cindex prompts, omitting
+Do not overwrite an existing file.
+...@mvoptsifn
+This option turns off the backup.
@item -u
@itemx --update
diff --git a/src/cp.c b/src/cp.c
index 8e34965..9f43875 100644
--- a/src/cp.c
+++ b/src/cp.c
@@ -116,6 +116,7 @@ static struct option const long_opts[] =
{"force", no_argument, NULL, 'f'},
{"interactive", no_argument, NULL, 'i'},
{"link", no_argument, NULL, 'l'},
+ {"no-clobber", no_argument, NULL, 'n'},
{"no-dereference", no_argument, NULL, 'P'},
{"no-preserve", required_argument, NULL, NO_PRESERVE_ATTRIBUTES_OPTION},
{"no-target-directory", no_argument, NULL, 'T'},
@@ -167,8 +168,10 @@ Mandatory arguments to long options are mandatory for short options too.\n\
"), stdout);
fputs (_("\
-f, --force if an existing destination file cannot be\n\
- opened, remove it and try again\n\
- -i, --interactive prompt before overwrite\n\
+ opened, remove it and try again (The -f option\n\
+ is redundant if the -n option is used.)\n\
+ -i, --interactive prompt before overwrite (The -i option\n\
+ overrides a previous -n option.)\n\
-H follow command-line symbolic links in SOURCE\n\
"), stdout);
fputs (_("\
@@ -176,6 +179,8 @@ Mandatory arguments to long options are mandatory for short options too.\n\
-L, --dereference always follow symbolic links in SOURCE\n\
"), stdout);
fputs (_("\
+ -n, --no-clobber do not overwrite an existing file (The -n\n\
+ option overrides a previous -i option.)\n\
-P, --no-dereference never follow symbolic links in SOURCE\n\
"), stdout);
fputs (_("\
@@ -894,7 +899,7 @@ main (int argc, char **argv)
we'll actually use backup_suffix_string. */
backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
- while ((c = getopt_long (argc, argv, "abdfHilLprst:uvxPRS:T",
+ while ((c = getopt_long (argc, argv, "abdfHilLnprst:uvxPRS:T",
long_opts, NULL))
!= -1)
{
@@ -950,6 +955,10 @@ main (int argc, char **argv)
x.dereference = DEREF_ALWAYS;
break;
+ case 'n':
+ x.interactive = I_ALWAYS_NO;
+ break;
+
case 'P':
x.dereference = DEREF_NEVER;
break;
diff --git a/src/mv.c b/src/mv.c
index 98309a4..1c18701 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -62,6 +62,7 @@ static struct option const long_options[] =
{"backup", optional_argument, NULL, 'b'},
{"force", no_argument, NULL, 'f'},
{"interactive", no_argument, NULL, 'i'},
+ {"no-clobber", no_argument, NULL, 'n'},
{"no-target-directory", no_argument, NULL, 'T'},
{"strip-trailing-slashes", no_argument, NULL, STRIP_TRAILING_SLASHES_OPTION},
{"suffix", required_argument, NULL, 'S'},
@@ -294,8 +295,13 @@ Mandatory arguments to long options are mandatory for short options too.\n\
fputs (_("\
--backup[=CONTROL] make a backup of each existing destination file\n\
-b like --backup but does not accept an argument\n\
- -f, --force do not prompt before overwriting\n\
- -i, --interactive prompt before overwrite\n\
+ -f, --force do not prompt before overwriting (The -f option\n\
+ overrides any previous -i or -n options.)\n\
+ -i, --interactive prompt before overwrite (The -i option\n\
+ overrides any previous -f or -n options.)\n\
+ -n, --no-clobber do not overwrite an existing file (The -n\n\
+ option overrides any previous -f or -i\n\
+ options.)\n\
"), stdout);
fputs (_("\
--strip-trailing-slashes remove any trailing slashes from each SOURCE\n\
@@ -358,7 +364,7 @@ main (int argc, char **argv)
we'll actually use backup_suffix_string. */
backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
- while ((c = getopt_long (argc, argv, "bfit:uvS:T", long_options, NULL))
+ while ((c = getopt_long (argc, argv, "bfint:uvS:T", long_options, NULL))
!= -1)
{
switch (c)
@@ -374,6 +380,9 @@ main (int argc, char **argv)
case 'i':
x.interactive = I_ASK_USER;
break;
+ case 'n':
+ x.interactive = I_ALWAYS_NO;
+ break;
case STRIP_TRAILING_SLASHES_OPTION:
remove_trailing_slashes = true;
break;
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 8dbbe9f..6dce9cd 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -379,6 +379,7 @@ TESTS = \
mv/into-self-3 \
mv/into-self-4 \
mv/leak-fd \
+ mv/mv-n \
mv/mv-special-1 \
mv/no-target-dir \
mv/part-fail \
diff --git a/tests/cp/cp-i b/tests/cp/cp-i
index 94284be..0846c43 100755
--- a/tests/cp/cp-i
+++ b/tests/cp/cp-i
@@ -31,4 +31,37 @@ fail=0
# coreutils 6.2 cp would neglect to prompt in this case.
echo n | cp -iR a b 2>/dev/null || fail=1
+# test miscellaneous combinations of -f -i -n parameters
+touch c d || framework_failure
+echo "\`c' -> \`d'" > out_copy
+> out_empty
+
+# ask for overwrite, answer no
+echo n | cp -vi c d 2>/dev/null > out1 || fail=1
+compare out1 out_empty || fail=1
+
+# ask for overwrite, answer yes
+echo y | cp -vi c d 2>/dev/null > out2 || fail=1
+compare out2 out_copy || fail=1
+
+# -i wins over -n
+echo y | cp -vni c d 2>/dev/null > out3 || fail=1
+compare out3 out_copy || fail=1
+
+# -n wins over -i
+echo y | cp -vin c d 2>/dev/null > out4 || fail=1
+compare out4 out_empty || fail=1
+
+# ask for overwrite, answer yes
+echo y | cp -vfi c d 2>/dev/null > out5 || fail=1
+compare out5 out_copy || fail=1
+
+# do not ask, prevent from overwrite
+echo n | cp -vfn c d 2>/dev/null > out6 || fail=1
+compare out6 out_empty || fail=1
+
+# do not ask, prevent from overwrite
+echo n | cp -vnf c d 2>/dev/null > out7 || fail=1
+compare out7 out_empty || fail=1
+
Exit $fail
diff --git a/tests/mv/mv-n b/tests/mv/mv-n
new file mode 100755
index 0000000..02dbcfa
--- /dev/null
+++ b/tests/mv/mv-n
@@ -0,0 +1,58 @@
+#!/bin/sh
+# Test whether mv -n works as documented (not overwrite target).
+
+# Copyright (C) 2006-2008 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+ set -x
+ mv --version
+fi
+
+. $srcdir/test-lib.sh
+
+fail=0
+
+# test miscellaneous combinations of -f -i -n parameters
+touch a b || framework_failure
+echo "\`a' -> \`b'" > out_move
+> out_empty
+
+# ask for overwrite, answer no
+touch a b || framework_failure
+echo n | mv -vi a b 2>/dev/null > out1 || fail=1
+compare out1 out_empty || fail=1
+
+# ask for overwrite, answer yes
+touch a b || framework_failure
+echo y | mv -vi a b 2>/dev/null > out2 || fail=1
+compare out2 out_move || fail=1
+
+# -n wins (as the last option)
+touch a b || framework_failure
+echo y | mv -vin a b 2>/dev/null > out3 || fail=1
+compare out3 out_empty || fail=1
+
+# -n wins (as the last option)
+touch a b || framework_failure
+echo y | mv -vfn a b 2>/dev/null > out4 || fail=1
+compare out4 out_empty || fail=1
+
+# -n wins (as the last option)
+touch a b || framework_failure
+echo y | mv -vifn a b 2>/dev/null > out5 || fail=1
+compare out5 out_empty || fail=1
+
+Exit $fail
--
1.5.4.3
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