diff --git a/source/src/command.cpp b/source/src/command.cpp
index 74852d89..d665ee09 100644
--- a/source/src/command.cpp
+++ b/source/src/command.cpp
@@ -704,15 +704,18 @@ COMMAND(at, ARG_2STR);
 COMMAND(listlen, ARG_1EST);
 COMMAND(findlist, ARG_2STR);
 
-int add(int a, int b)   { return a+b; }         COMMANDN(+, add, ARG_2EXP);
-int mul(int a, int b)   { return a*b; }         COMMANDN(*, mul, ARG_2EXP);
-int sub(int a, int b)   { return a-b; }         COMMANDN(-, sub, ARG_2EXP);
-int divi(int a, int b)  { return b ? a/b : 0; } COMMANDN(div, divi, ARG_2EXP);
-int mod(int a, int b)   { return b ? a%b : 0; } COMMAND(mod, ARG_2EXP);
-int equal(int a, int b) { return (int)(a==b); } COMMANDN(=, equal, ARG_2EXP);
+int add(int a, int b)   { return a+b; }            COMMANDN(+, add, ARG_2EXP);
+int mul(int a, int b)   { return a*b; }            COMMANDN(*, mul, ARG_2EXP);
+int sub(int a, int b)   { return a-b; }            COMMANDN(-, sub, ARG_2EXP);
+int divi(int a, int b)  { return b ? a/b : 0; }    COMMANDN(div, divi, ARG_2EXP);
+int mod(int a, int b)   { return b ? a%b : 0; }    COMMAND(mod, ARG_2EXP);
+int nota(int a) { return (int)(!a); }              COMMANDN(!=, nota, ARG_1EXP);
+int equal(int a, int b) { return (int)(a==b); }    COMMANDN(=, equal, ARG_2EXP);
 int notequal(int a, int b) { return (int)(a!=b); } COMMANDN(!=, notequal, ARG_2EXP);
-int lt(int a, int b)    { return (int)(a<b); }  COMMANDN(<, lt, ARG_2EXP);
-int gt(int a, int b)    { return (int)(a>b); }  COMMANDN(>, gt, ARG_2EXP);
+int lt(int a, int b)    { return (int)(a<b); }     COMMANDN(<, lt, ARG_2EXP);
+int gt(int a, int b)    { return (int)(a>b); }     COMMANDN(>, gt, ARG_2EXP);
+int lte(int a, int b)    { return (int)(a<=b); }   COMMANDN(<=, lte, ARG_2EXP);
+int gte(int a, int b)    { return (int)(a>=b); }   COMMANDN(>=, gte, ARG_2EXP);
 
 void anda (char *a, char *b) { intret(execute(a)!=0 && execute(b)!=0); }
 void ora  (char *a, char *b) { intret(execute(a)!=0 || execute(b)!=0); }