Difference between revisions of "Manual:Scripting"

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Revision as of 10:06, 26 September 2008

Scripting language manual


Line structure

RouterOS script is divided into number of logical lines.

Logical line

The end of logical line is represented by the token “;” or NEWLINE. Logical line can be constructed from more than one physical line by following line joining rules.

Physical Line

A physical line is a sequence of characters terminated by an end-of-line (EOL) sequence. Any of the standard platform line termination sequences can be used:

unix– ASCII LF
windows– ASCII CR LF;
mac– ASCII CR;

Standard C conventions for new line characters can be used ( the \n character).


A comment starts with a hash character (#) and ends at the end of the physical line. A comment signifies the end of the logical line unless line joining rules are invoked ( nav taisniiba, skat piemeerus). Comments are ignored by syntax. If (#) character appear inside string it is not considered a comment.

# this is a comment

:global a; # bad comment (MRZ: shitadu vajadzetu atlaut)

:global myStr "lala # this is not a comment"

Line joining

Two or more physical lines may be joined into logical lines using backslash character (\). A line ending in a backslash cannot carry a comment. A backslash does not continue a comment. A backslash does not continue a token except for string literals. (MRZ: nezinu vai shii ir taisniiba, buutu logiski ja taa buutu). A backslash is illegal elsewhere on a line outside a string literal.

:if ($a = true \
      and $b=false) do={ :put “$a $b”; }

:if ($a = true \      # bad comment
      and $b=false) do={ :put “$a $b”; }

# comment \
    continued – invalid  (syntax error)

Whitespace between tokens

Whitespace can be used to separate tokens. Whitespace is necessary between two tokens only if their concatenation could be interpreted as a different token.

   :local a true; :local b false;
   :put (a&&b);      # whitespace is not required
   :put (a and b);   # whitespace is required


( Vai RouterOSaa vispaar ir keywordi??? )
The following words are keywords and cannot be used as variable and function names:

and       or        not       break
continue  do        for       foreach
in        from      to        while
global    local     if        else

(break un continue vajadzeetu ieviest)
(varbuut veel kaads?)


The following tokens serve as delimiters in the grammar:

()  []  {}  :   ;   $   / 

Data types

RouterOS scripting language has following data types:

number- 64bit signed integer, possible hexadecimal input;
boolean- values can bee true or false;
string- character sequence (??? kaads ir memas limits ???);
IP- IP address;
internal ID- hexadecimal value prefixed by '*' sign. Each menu item has assigned unique number - internal ID;
time- date and time value;
array- sequence of values organized in an array;
nothing- default variable type if no value is assigned;

Constant Escape Sequences

Following escape sequences can be used to define certain special character within string:

\' - single quote
\" - double quote
\\ - backslash
\n - newline
\r - carriage return
\t - horizontal tab

(MRZ: varbuut veel kaads)

:put "This\nis\na\ntest";

which will show on display
( MRZ: bugs vai fiicha ??? ka whitespaci katras jaunas rindas priekshaa??? ).



Arithmetic Operators

Usual arithmetic operators are supported in RouterOS scripting language

Opearator Description Example
"+" binary addition :put (3+4);
"-" binary subtraction :put (1-6);
"*" binary multiplication :put (4*5);
"/" binary division :put (10/2);
"-" unary negation { :local a 1; :put (-a); }
"+" unary plus

Relational Operators

Opearator Description Example
"<" less :put (3<4);
">" greater :put (3>4);
"=" equal :put (2=2);
"<=" less or equal
">=" greater or equal
"!=" not equal

Logical Operators

Opearator Description Example
“!” , “not” logical NOT :put (!true);
“&&” , “and” logical AND :put (true&&true)
“||” , “or” logical OR :put (true||false);

Bitwise Operators

Laikam no v3.12 visi bitwise operatori nav attiecinaami tikai uz IP adreseem, bet arii citiem mainigajiem.

Opearator Description Example
“~” bit inversion :put (~
“|” bitwise OR. Performs logical OR operation on each pair of corresponding bits. In each pair the result is “1” if one of bits or both bits are “1”, otherwise the result is “0”.
“^” bitwise XOR. The same as OR, but the result in each position is “1” if two bits are not equal, and “0” if bits are equal.
“&” bitwise AND. In each pair the result is “1” if first and second bit is “1”. Otherwise the result is “0”.
“<<” left shift by given amount of bits
“>>” right shift by given amount of bits

Concatenation Operators

Opearator Description Example
“.” concatenates two strings :put (“concatenate” . “ “ . “string”);


Other Operators

Opearator Description Example
“[]” nez kaa lai shito zveeru nosauc :put [ :len "my test string"; ];
“()” group operator :put ( "value is " . (4+5));
“,” sequential evaluation operator target-addresses=,


Global commands

Every global command should start with ":" token, otherwise it will be treated as variable. ( Velak laikam buus ka vares rakstit komandas bez ";"

Command Syntax Description Example
/ go to root menu
.. go back by one menu level
global :global <var> [<value>] define global variable :global myVar "something"; :put $myVar;
local :local <var> [<value>] define local variable { :local myLocalVar "I am local"; :put $myVar; }
beep :beep <freq> <length> beep built in speaker
delay :delay <time> do nothing for a given period of time
put :put <expression> put supplied argument to console
len :len <expression> return string length or array element count :put [:length "length=8"];
typeof :typeof <var> return data type of variable