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You can choose to let SABnzbd run a script just before an NZB enters the queue.
This script will tell whether the NZB should be accepted or not and can modify some parameters.

Scripts can be Python scripts, bash scripts and BAT scripts. All scripts must be located in the scripts-directory, that can be specified in Config->Folders. Furthermore, the script must be executable. On Linux this means the x-bit must be on. On Windows, the requirement is that the script's extension is listed in your system's PATHEXT environment variable.

The script must write results to the console.
Exit code 0 will make SABnzbd inspect the returned output.
If the script has an exit code other than 0, it's assumed the script failed, and the NZB will be accepted without changes.

Input parameters

All parameters (except 1) can be empty, meaning a default value. Use %1 in Windows scripts and $1 in Unix scripts. Note that on Windows the input parameters are surrounded by quotes (e.g. "job name").

Much more information is available to scripts via environment variables, see below!

Return parameters

The script can refuse or accept the NZB and it can also return alternative parameters. These parameters should be written to the console, each parameter on a separate line.
SABnzbd uses the first 7 lines of output, so they should only contain proper data (or be empty).
Anything after line 7 is ignored.

When you want to manipulate the show/season/episode parameters, you should assemble a new name and return a recognized format.

Enviroment variables

v2.3.5+ Enviroment variables were added in SABnzbd 2.3.5.

Your script can get extra information via environment variables (return information should still be send as plain output):

Example Script 1

Example of a Windows batch file that forces high priority on anything smaller than 2GB.

@echo off
echo 1
echo.
echo.
echo.
echo.
if %6 LSS 2000000000 echo 1

Save it as file size-checker.cmd and put in the scripts folder.

Example Script 2

A python script to set prio to Force on downloads smaller than 50MB:

import sys

try:
    (scriptname, nzbname, postprocflags, category, script, prio, downloadsize, grouplist, showname, season, episodenumber, episodename) = sys.argv
    downloadsize = int(downloadsize)
except:
    sys.exit(1)    # exit with 1 causes SABnzbd to ignore the output of this script

prio = -100    # Default
if downloadsize > 50111222:
    prio = 2

print "1"    # Accept
print
print
print
print
print prio
print
# 0 means OK
sys.exit(0)