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Add the '-u name' option to the env command, which will completely unset

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the given variable name (removing it from the environment, instead of
just setting it to a null value).

PR:		bin/65649
MFC after:	2 weeks
This commit is contained in:
Garance A Drosehn 2008-04-17 23:17:09 +00:00
parent 12b6a0f87c
commit a414225db1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=178289
2 changed files with 31 additions and 8 deletions
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26
usr.bin/env/env.1 vendored
View File

@ -35,7 +35,7 @@
.\" From FreeBSD: src/usr.bin/printenv/printenv.1,v 1.17 2002/11/26 17:33:35 ru Exp
.\" $FreeBSD$
.\"
.Dd June 20, 2005
.Dd July 29, 2005
.Dt ENV 1
.Os
.Sh NAME
@ -46,6 +46,7 @@
.Op Fl iv
.Op Fl P Ar altpath
.Op Fl S Ar string
.Op Fl u Ar name
.Op Ar name Ns = Ns Ar value ...
.Op Ar utility Op Ar argument ...
.Sh DESCRIPTION
@ -99,6 +100,21 @@ The
option recognizes some special character escape sequences and
also supports environment-variable substitution, as described
below.
.\" -u
.It Fl u Ar name
If the environment variable
.Ar name
is in the environment, then remove it before processing the
remaining options.
This is similar to the
.Ic unset
command in
.Xr sh 1 .
The value for
.Ar name
must not include the
.Ql =
character.
.\" -v
.It Fl v
Print verbose information for each step of processing done by the
@ -436,12 +452,12 @@ The
utility conforms to
.St -p1003.1-2001 .
The
.Fl P , S
.Fl P , S , u
and
.Fl v
options are non-standard
.Fx
extensions which may not be available on other operating systems.
options are non-standard extensions supported by
.Fx ,
but which may not be available on other operating systems.
.Sh HISTORY
The
.Nm

13
usr.bin/env/env.c vendored
View File

@ -71,7 +71,7 @@ main(int argc, char **argv)
altpath = NULL;
want_clear = 0;
while ((ch = getopt(argc, argv, "-iP:S:v")) != -1)
while ((ch = getopt(argc, argv, "-iP:S:u:v")) != -1)
switch(ch) {
case '-':
case 'i':
@ -87,6 +87,13 @@ main(int argc, char **argv)
*/
split_spaces(optarg, &optind, &argc, &argv);
break;
case 'u':
if (env_verbosity)
fprintf(stderr, "#env unset:\t%s\n", optarg);
rtrn = unsetenv(optarg);
if (rtrn == -1)
err(EXIT_FAILURE, "unsetenv %s", optarg);
break;
case 'v':
env_verbosity++;
if (env_verbosity > 1)
@ -135,7 +142,7 @@ static void
usage(void)
{
(void)fprintf(stderr,
"usage: env [-iv] [-P utilpath] [-S string] [name=value ...]"
" [utility [argument ...]]\n");
"usage: env [-iv] [-P utilpath] [-S string] [-u name]\n"
" [name=value ...] [utility [argument ...]]\n");
exit(1);
}