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Annotation of 43BSDTahoe/man/man3/getenv.3, revision 1.1

1.1     ! root        1: .\"    @(#)getenv.3    6.4 (Berkeley) 3/20/87
        !             2: .\"
        !             3: .TH GETENV 3 "March 20, 1987"
        !             4: .AT 3
        !             5: .SH NAME
        !             6: getenv, setenv, unsetenv \- manipulate environmental variables
        !             7: .SH SYNOPSIS
        !             8: .nf
        !             9: .B char *getenv(name)
        !            10: .B char *name;
        !            11: .PP
        !            12: .B setenv(name, value, overwrite)
        !            13: .B char *name, value;
        !            14: .B int overwrite;
        !            15: .PP
        !            16: .B void unsetenv(name)
        !            17: .B char *name;
        !            18: .fi
        !            19: .SH DESCRIPTION
        !            20: \fIGetenv\fP searches the environment list (see \fIenviron\fP(7))
        !            21: for a string of the form \fIname\fP\fB=\fP\fIvalue\fP and returns
        !            22: a pointer to the string \fIvalue\fP if such a string is present,
        !            23: and 0 (NULL) if it is not.
        !            24: .PP
        !            25: \fISetenv\fP searches the environment list as \fIgetenv\fP does; if
        !            26: the string \fIname\fP is not found, a string of the form
        !            27: \fIname\fP\fB=\fP\fIvalue\fP is added to the environment.  If it is
        !            28: found, and \fIoverwrite\fP is non-zero, its value is changed to
        !            29: \fIvalue\fP.  \fISetenv\fP returns 0 on success and -1 on failure,
        !            30: where failure is caused by an inability to allocate space for the
        !            31: environment.
        !            32: .PP
        !            33: \fIUnsetenv\fP removes all occurrences of the string \fIname\fP from
        !            34: the environment.  There is no library provision for completely removing
        !            35: the current environment.  It is suggested that the following code be
        !            36: used to do so.
        !            37: .PP
        !            38: .nf
        !            39:        static char     *envinit[1];
        !            40:        extern char     **environ;
        !            41:        environ = envinit;
        !            42: .fi
        !            43: .PP
        !            44: All of these routines permit, but do not require, a trailing equals
        !            45: (``='') sign on \fIname\fP or a leading equals sign on \fIvalue\fP.
        !            46: .SH SEE ALSO
        !            47: csh(1), sh(1), execve(2), environ(7)

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