| 1 | /* env - run a program in a modified environment
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| 2 | Copyright (C) 1986, 1991-2005 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, write to the Free Software Foundation,
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| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 17 |
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| 18 | /* Richard Mlynarik and David MacKenzie */
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| 19 |
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| 20 | /* Options:
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| 21 | -
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| 22 | -i
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| 23 | --ignore-environment
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| 24 | Construct a new environment from scratch; normally the
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| 25 | environment is inherited from the parent process, except as
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| 26 | modified by other options.
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| 27 |
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| 28 | -u variable
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| 29 | --unset=variable
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| 30 | Unset variable VARIABLE (remove it from the environment).
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| 31 | If VARIABLE was not set, does nothing.
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| 32 |
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| 33 | variable=value (an arg containing a "=" character)
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| 34 | Set the environment variable VARIABLE to value VALUE. VALUE
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| 35 | may be of zero length ("variable="). Setting a variable to a
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| 36 | zero-length value is different from unsetting it.
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| 37 |
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| 38 | --
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| 39 | Indicate that the following argument is the program
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| 40 | to invoke. This is necessary when the program's name
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| 41 | begins with "-" or contains a "=".
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| 42 |
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| 43 | The first remaining argument specifies a program to invoke;
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| 44 | it is searched for according to the specification of the PATH
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| 45 | environment variable. Any arguments following that are
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| 46 | passed as arguments to that program.
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| 47 |
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