Created
April 27, 2012 07:09
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C Umgebungsvariablen auslesen, erstellen und ändern
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#include<stdio.h> | |
#include<stdlib.h> | |
// #include<unistd.h> (char ** environ) (alternative zu char*envp[]) | |
int main(int argc, char* argv[],char *envp[]) | |
{ | |
char * variable; // Definierte Variable | |
int i = 0; // Laufvariable | |
// Gib alle Variablen aus wenn keine Parameter gegeben sind | |
if(argc != 2) | |
{ | |
//printf("Bitte geben Sie einen Variablenamen an\n"); | |
while(envp[i] != NULL) | |
{ | |
printf("[%s] :: \n", envp[i]); | |
i++; | |
} | |
// HUGO erzeugen | |
printf("Variable HUGO wird beschrieben ... \n"); | |
setenv("HUGO","hugo",0); | |
printf("Sie lautet %s \n",getenv("HUGO")); | |
} | |
// Gib eine Spezifische Variable aus | |
else | |
{ | |
// Laden | |
variable = getenv(argv[1]); | |
// Ausgeben falls vorhanden | |
if(variable != NULL) | |
{ | |
printf("%s -> %s\n",argv[1],variable); | |
} | |
// falls nicht | |
else | |
{ | |
printf("Variable nicht gefunden\n"); | |
return EXIT_FAILURE; | |
} | |
} | |
return EXIT_SUCCESS; | |
} |
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