issue executing unix commands using system() in c - c

Question

I'm currently trying to write a program to accept user input to and execute commands in a unix system, the code compiles but when I run it I get a segmentation fault. I think it might be related to the input data type for the system() function but I can't seem to figure it out
#include<stdio.h>
#include<stdlib.h>
#include <string.h>
char argument[1024];
main() {
fgets(argument, 1024, stdin);
strtok (argument, "\n");
char *command = strcat("cd ", argument);
int response = system(command);
if(response == -1)
{
printf("error executing command");
}
}
I apologise if this seems trivial I don't have much experience with c

Answer 1

You are programming in C in an Unix system.
The language C was written just to write Unix itself. system() was written in C, Unix, Windows, Linux, Android, MacOS, Python, java, everything was written in C at first and still is at the most part.
And you have many shells in Unix and derivatives that just run commands as the user types them.
So to use system() to run a command does not add much. Just another level of indirection, an a big security hole, since your program can be used to do unexpected things by not so good people. Using YOUR program.
An alternative
This is the output of the program below
Current directory is: /home/testing/projects/tcursor
directory changed to '/tmp'
Enter name of directory to create: thing
'/tmp/thing' created
Now changing to newly created folder
Current directory is: '/tmp/thing'
The program just
cwd to /tmp
prompt for the name a folder to create
creates the folder
cd to it
shows current dir
returning 1,2,3,4 in case of error, 0 in case of success
So you can see some C code to cd, pwd and mkdir
int main(void)
{
char asw[30];
char buffer[1024];
char* p = buffer;
const char* temp = "/tmp";
p = getcwd(p,1024);
printf("Current directory is: %s\n",p);
int n = chdir(temp);
if ( n != 0 ) return(1);
printf("directory changed to '%s'\n", temp);
printf("Enter name of directory to create: ");
fgets(asw,30,stdin);
asw[strlen(asw)-1] = 0;
n = mkdir(asw, 0777 );
if ( n != 0 ) return(2);
printf("'%s' created\n", buffer);
printf("Now changing to newly created folder\n");
sprintf(buffer,"%s/%s", temp, asw);
n = chdir(buffer);
if ( n != 0 ) return(4);
p = getcwd(p,1024);
printf("Current directory is: '%s'\n",p);
return 0;
Do not use system()