Here's a batch script that Branimir wrote to do a file upload from Linux:
#!/bin/sh
## A simple demonstration of using FogBugz 6 API from Unix shell
## by branimir@fogcreek.com
## Grabs the whole screen and sends it to FogBugz
## Requires ImageMagick, curl
BASE=https://my.fogbugz.com
EMAIL=me@example.com
PASS=BigGnus
# Grab the screen
import -window root screenshot.png
# Find the API URL (usually something like FogBugz/api.asp)
URL=`curl $BASE/api.xml | sed -n 's/^.*\(.*\)<\/url>.*$/\1/p'`
# Logon to FogBugz
TOKEN=`curl "${BASE}/${URL}cmd=logon&email=$EMAIL&password=$PASS" | sed -n 's/^.*\(.*\)<\/token>.*$/\1/p'`
# Send the screenshot
curl -F"token=$TOKEN" -F"cmd=new" -F"sTitle=New Screenshot" -F"File1=@screenshot.png" $BASE/$URL
