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You should not use scanf to read lines, scanf has a list of problems that are too long to get into. (sscanf is safer.)

char buf[512];

fgets(buf, 512, stdin); // Read a line
if(strchr(buf,...

try this.. not tested


char str[10];
char cmd[20];
printf("Enter the string : ");
scanf("%s",str);
sprintf(cmd,"whereis %s",str);
system(cmd);

Pls use code tags as advised.
You did not read what I wrote. Put everything into a new variable and supply that (I think by reference) to the system call.

You should allocate a char variable, fill it with the string constant "whereis " (e.g. sprintf) and the contents of your user input variable (e.g. strcpy), and supply that to the system call.

I really appreciate you help me!

I don’t have much real knowledge of this kind of stuff, nor know the technical terms. Most of what I know is just from messing around, one of these days I should...

Ah, so you want to touch directory contents. You don't need a seperate command, though, just put two together, one to find files, one to touch them. find path/to/directory -exec touch '{}' ';'...