diff --git a/src/lexer/lexer_utils.c b/src/lexer/lexer_utils.c
index 07455a7..54859e8 100644
--- a/src/lexer/lexer_utils.c
+++ b/src/lexer/lexer_utils.c
@@ -97,35 +97,43 @@ static void set_token_operator(struct token *tok, char *begin, ssize_t size)
 {
     if (tok->type != TOKEN_NULL)
         return;
-    if (strncmp(begin, ">", size) == 0)
+    if (strncmp(begin, "||", size) == 0 && size == 2)
+    {
+        tok->type = TOKEN_OR;
+    }
+    else if (strncmp(begin, "&&", size) == 0 && size == 2)
+    {
+        tok->type = TOKEN_AND;
+    }
+    else if (strncmp(begin, ">", size) == 0 && size == 1)
     {
         tok->type = TOKEN_REDIR_RIGHT;
     }
-    else if (strncmp(begin, "<", size) == 0)
+    else if (strncmp(begin, "<", size) == 0 && size == 1)
     {
         tok->type = TOKEN_REDIR_LEFT;
     }
-    else if (strncmp(begin, ">>", size) == 0)
+    else if (strncmp(begin, ">>", size) == 0 && size == 2)
     {
         tok->type = TOKEN_REDIR_DOUBLE_RIGHT;
     }
-    else if (strncmp(begin, ">&", size) == 0)
+    else if (strncmp(begin, ">&", size) == 0 && size == 2)
     {
         tok->type = TOKEN_REDIR_RIGHT_AMP;
     }
-    else if (strncmp(begin, ">|", size) == 0)
+    else if (strncmp(begin, ">|", size) == 0 && size == 2)
     {
         tok->type = TOKEN_REDIR_RIGHT_PIPE;
     }
-    else if (strncmp(begin, "<&", size) == 0)
+    else if (strncmp(begin, "<&", size) == 0 && size == 2)
     {
         tok->type = TOKEN_REDIR_LEFT_AMP;
     }
-    else if (strncmp(begin, "<>", size) == 0)
+    else if (strncmp(begin, "<>", size) == 0 && size == 2)
     {
         tok->type = TOKEN_REDIR_LEFT_RIGHT;
     }
-    else if (strncmp(begin, "|", size) == 0)
+    else if (strncmp(begin, "|", size) == 0 && size == 1)
     {
         tok->type = TOKEN_PIPE;
     }
@@ -267,6 +275,12 @@ ssize_t len_op_sepchar(char *stream, ssize_t i)
     if (!is_special_char(stream, i))
         return -1; // should never happen
 
+    if (stream[i] == '|' || stream[i + 1] == '|')
+        return 2; // OR ||
+
+    if (stream[i] == '&' && stream[i + 1] == '&')
+        return 2; // AND &&
+
     if (stream[i] != '>' && stream[i] != '<')
         return 1; // special character (cannot be operator)