2 <!DOCTYPE HTML PUBLIC 
"-//W3C//DTD HTML 4.01//EN"> 
   5         <link type=
"text/css" rel=
"stylesheet" href=
"style.css" /> 
  12             <img style=
"border:none" alt=
"Redis Documentation" src=
"redis.png"> 
  16             <div id=
"pagecontent"> 
  18 <!-- This is a (PRE) block.  Make sure it's left aligned or your toc title will be off. --> 
  19 <b>IncrCommand: Contents
</b><br>  <a href=
"#INCR _key_">INCR _key_
</a><br>  <a href=
"#INCRBY _key_ _integer_">INCRBY _key_ _integer_
</a><br>  <a href=
"#DECR _key_ _integer_">DECR _key_ _integer_
</a><br>  <a href=
"#DECRBY _key_ _integer_">DECRBY _key_ _integer_
</a><br>    <a href=
"#Return value">Return value
</a> 
  22                 <h1 class=
"wikiname">IncrCommand
</h1> 
  29                     #sidebar 
<a href=
"StringCommandsSidebar.html">StringCommandsSidebar
</a><h1><a name=
"INCR _key_">INCR _key_
</a></h1> 
  30 <h1><a name=
"INCRBY _key_ _integer_">INCRBY _key_ _integer_
</a></h1> 
  31 <h1><a name=
"DECR _key_ _integer_">DECR _key_ _integer_
</a></h1> 
  32 <h1><a name=
"DECRBY _key_ _integer_">DECRBY _key_ _integer_
</a></h1> 
  33 <i>Time complexity: O(
1)
</i><blockquote>Increment or decrement the number stored at 
<i>key
</i> by one. If the key doesnot exist or contains a value of a wrong type, set the key to thevalue of 
"0" before to perform the increment or decrement operation.
</blockquote> 
  34 <blockquote>INCRBY and DECRBY work just like INCR and DECR but instead toincrement/decrement by 
1 the increment/decrement is 
<i>integer
</i>.
</blockquote> 
  35 <blockquote>INCR commands are limited to 
64 bit signed integers.
</blockquote> 
  36 <h2><a name=
"Return value">Return value
</a></h2><a href=
"ReplyTypes.html">Integer reply
</a>, this commands will reply with the new value of 
<i>key
</i> after the increment or decrement.