29 lines
536 B
C
29 lines
536 B
C
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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int main()
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{
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char *cmd[] = {"who", "ls", "date", "notacommand"};
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int i;
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while(1)
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{
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printf("0=who, 1=ls, 2=date, 3=notacommand :");
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scanf("%d", &i);
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if(fork() == 0)
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{
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execlp(cmd[i], cmd[i], 0); // If execlp runs correctly, control
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// is transfer to the new program
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printf("command not found\n"); // exec failed
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exit(1);
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}
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else
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{
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// Parent waits for child process to complete
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wait(0);
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}
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}
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}
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