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Annotation of coherent/a/usr/man/MULTI/getenv, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: getenv()                 General Function                getenv()
        !             4: 
        !             5: 
        !             6: 
        !             7: 
        !             8: Read environmental variable
        !             9: 
        !            10: cchhaarr *ggeetteennvv(_V_A_R_I_A_B_L_E) cchhaarr *_V_A_R_I_A_B_L_E;
        !            11: 
        !            12: A program  may read variables from  its environment.  This allows
        !            13: the program  to accept information  that is specific  to it.  The
        !            14: environment consists of an array of strings, each having the form
        !            15: VARIABLE=VALUE.   When called  with the  string  VARIABLE, getenv
        !            16: reads the environment, and returns a pointer to the string VALUE.
        !            17: 
        !            18: ***** Example *****
        !            19: 
        !            20: This example prints the environmental variable PATH.
        !            21: 
        !            22: 
        !            23: #include <stdio.h>
        !            24: 
        !            25: main()
        !            26: {
        !            27:         char *env;
        !            28:         extern char *getenv();
        !            29: 
        !            30: 
        !            31: 
        !            32:         if ((env = getenv("PATH")) == NULL) {
        !            33:                 printf("Sorry, cannot find PATH\n");
        !            34:                 exit(1);
        !            35:         }
        !            36:         printf("PATH = %s\n", env);
        !            37: }
        !            38: 
        !            39: 
        !            40: ***** See Also *****
        !            41: 
        !            42: environmental variables, envp, exec, sh
        !            43: 
        !            44: ***** Diagnostics *****
        !            45: 
        !            46: When VARIABLE is not found or has no value, getenv returns NULL.
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        !            64: COHERENT Lexicon                                           Page 1
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