1 files changed, 30 insertions, 0 deletions

diff --git a/cmd.h b/cmd.h
new file mode 100644
index 0000000..adf03c7
--- /dev/null
+++ b/cmd.h
@@ -0,0 +1,30 @@
+#ifndef CMD_H
+#define CMD_H
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef enum {
+    CMD_TYPE_NORMAL,
+    CMD_TYPE_PIPE,
+    CMD_TYPE_AND,
+    CMD_TYPE_OR,
+    // add more command types as needed
+} CommandType;
+
+typedef struct Command {
+    CommandType type; // the type of the command
+    char **args;      // an array of strings for the arguments of the command
+    struct Command *left;  // a pointer to the left sub-command
+    struct Command *right; // a pointer to the right sub-command
+    char *redirect_in;  // the file name for input redirection, or NULL if there
+                        // is no input redirection
+    char *redirect_out; // the file name for output redirection, or NULL if
+                        // there is no output redirection
+    char *append_out; // the file name for output appending, or NULL if there is
+                      // no output appending
+    // add more fields as needed
+} Command;
+
+#endif
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