CODEWITHSUNDEEP
carrayscharexecvp
purelyp93
purelyp93

Reputation: 65

Creating a new string from entries in a char* array

So here's my issue. I have a list of commands inputted from the user that I need to use to pass into execvp(). Here's an example with the ls command. 

char *cmdList = {"ls", "-l", "folder1/folder2"}

Now I need a way to modify that first entry so that is has the form "/bin/ls"

Is the only way to do it via the strcat command? Ideally I'd like to directly modify the ls entry so I could pass cmdList directly into execvp().

Upvotes: 1

Views: 60

Answers (2)

Koorosh Hajiani
Koorosh Hajiani

Reputation: 94

This workes for me.

char *cmdList[]= {"ls", "-l", "folder1/folder2"};

cmdList[0]="/bin/1s"; printf("%s", *cmdList);

Upvotes: 0

P.P
P.P

Reputation: 121407

You don't need to specify fullpath to use execvp(). So you don't need to worry about modifying the first argument. For example, if you have an array with arguments:

#include <unistd.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
   char *cmdList[] = {"ls", "-l", "folder1/folder2", 0};

   execvp(cmdList[0], cmdList);
}

execvp() will search ls in your PATH and execute it.

Upvotes: 1

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