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To use oauth you must register an application. Go to http://dev.twitter.com/ -> Your apps -> Register a new app. Fill in the form. Tell it the app is a client app and give it read+write permission.

When you have done that you will be presented with your application's settings page. The interesting parts are the "consumer key" and the "consumer secret" which are the half of your app's oauth credentials which authenticate the application to Twitter. The other half of the credentials prove that your app may do something to a particular person's Twitter account. In order to obtain the second half oauth normally requires a fairly complicated dance. Happily, for simple cases where you want to script your own account, Twitter provides a shortcut.

On your application's settings page, click the "My Access Token" link. This gives you a page containing your "access token" and "access token secret" which together with your "consumer key" and "consumer secret" allow your app to post to your Twitter account.

#!/bin/bash
# Meteohub - Twitter API OAUTH update script
# oauth_sign and http_post packages need to be installed
# replace keys with the ones you get from dev.twitter.com
#
DAY1=$(date -d today +%A)
nc localhost 5558 > sensordata.txt
DATE=$(date +'%d/%m/%Y')
TIME=$(date +'%H:%M')
#echo $TIME

actual_th0_temp_c=$(awk 'NR==64 { print $2 }' sensordata.txt)
last24h_th0_tempmin_c=$(awk 'NR==961 { print $2 }' sensordata.txt)
last24h_th0_tempmax_c=$(awk 'NR==963 { print $2 }' sensordata.txt)
actual_wind0_chill_c=$(awk 'NR==112 { print $2 }' sensordata.txt)
hour1_thb1_press_trend=$(awk 'NR==588 { print $2 }' sensordata.txt)
actual_tbh1_sealevel_hpa=$(awk 'NR==92 { print $2 }' sensordata.txt)
actual_wind0_speed_kmh=$(awk 'NR==108 { print $2 }' sensordata.txt)
actual_wind0_dir_en=$(awk 'NR==101 { print $2 }' sensordata.txt)
last24h_rain0_total_mm=$(awk 'NR==882 { print $2 }' sensordata.txt)
actual_th0_hum_rel=$(awk 'NR==66 { print $2 }' sensordata.txt)

if [ $hour1_thb1_press_trend = 1 ]
then
hour1_thb1_press_trend="⇑ rising ⇑"
elif [ $hour1_thb1_press_trend = 0 ]
then
hour1_thb1_press_trend="⇒ steady ⇒"
else
hour1_thb1_press_trend="⇓ falling ⇓"
fi

consumer_key="your consumer_key"
consumer_secret="your consumer_secret"
access_token="your access_token"
access_secret="your access_secret"
url="https://api.twitter.com/statuses/update.xml"

/usr/local/bin/http_post -h Authorization "$(/usr/local/bin/oauth_sign \
$consumer_key $consumer_secret \
$access_token $access_secret \
POST "$url" status="Temp $actual_th0_temp_c, min/max $last24h_th0_tempmin_c / $last24h_th0_tempmax_c°C · chill $actual_wind0_chill_c°C · Wind $actual_wind0_speed_kmh km/h $actual_wind0_dir_en · Baro $actual_tbh1_sealevel_hpa hPa $hour1_thb1_press_trend · Rain 24hrs $last24h_rain0_total_mm mm, Hum $actual_th0_hum_rel%")" \
"$url" status="Temp $actual_th0_temp_c, min/max $last24h_th0_tempmin_c / $last24h_th0_tempmax_c°C · chill $actual_wind0_chill_c°C · Wind $actual_wind0_speed_kmh km/h $actual_wind0_dir_en · Baro $actual_tbh1_sealevel_hpa hPa $hour1_thb1_press_trend · Rain 24hrs $last24h_rain0_total_mm mm, Hum $actual_th0_hum_rel%"