1 files changed, 42 insertions, 0 deletions
diff --git a/src/commands/id.c b/src/commands/id.c
new file mode 100644
index 0000000..ab974b1
--- /dev/null
+++ b/src/commands/id.c
@@ -0,0 +1,42 @@
+#include "../command.h"
+
+#include <grp.h>
+#include <pwd.h>
+#include <unistd.h>
+
+COMMAND_EMPTY(user_id) {
+
+    __uid_t uid = getuid();
+    __gid_t gid = getgid();
+    
+    struct passwd* pw = getpwuid(uid);
+    if(pw == NULL){
+        perror("error: failed to fetch groups: ");
+    }
+    
+    int ngroups = 0;
+    getgrouplist(pw->pw_name, pw->pw_gid, NULL, &ngroups);
+    
+    __gid_t groups[ngroups];
+    getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
+   
+    struct group* ugr = getgrgid(gid);
+    printf("uid=%d(%s) gid=%d(%s) ",
+           uid, ugr->gr_name, gid, ugr->gr_name);
+    
+    if (ngroups > 0) {
+        printf("groups=");
+    }
+
+    for (int i = 0; i < ngroups; i++){
+        struct group* gr = getgrgid(groups[i]);
+        if(gr == NULL){
+            perror("error: failed to fetch groups: ");
+        }
+        printf("%d(%s)", gr->gr_gid, gr->gr_name);
+        if (i + 1 < ngroups) putchar(',');
+    }
+    printf("\b\n");
+
+    return EXIT_SUCCESS;
+}