Crontab за стартиране на bash скрипт, който изпълнява множество python скриптове

Аз съм начинаещ в linux. Искам да изпълнявам множество скриптове на Python на всеки 30 секунди и планирам да направя това с помощта на скрипт bash (за стартиране на множество скриптове на Python едновременно) и crontab (за планиране на изпълнението на скриптовете на всеки 30 секунди).

Ето как моят bash скрипт:

#!/bin/bash
# This script is used to run multiple python script to query all types and all modes of GTFSR data

#Set working directory
cd "${0%/*}"

#BUS Query Real Time
python gtfsrdb_tfnsw.py -p 'https://api.transport.nsw.gov.au/v1/gtfs/vehiclepos/buses' --database="postgresql://localhost/test" —apikey="XXX" -m "buses" -c -1 &
python gtfsrdb_tfnsw.py -t 'https://api.transport.nsw.gov.au/v1/gtfs/realtime/buses' --database="postgresql://localhost/test" --apikey="XXX" -m "buses" -c -1 &
python gtfsrdb_tfnsw.py -a 'https://api.transport.nsw.gov.au/v1/gtfs/alerts/buses' --database="postgresql://localhost/test" --apikey="XXX" -m "buses" -c -1 &

#Sydney Train Real Time
python gtfsrdb_tfnsw.py -p 'https://api.transport.nsw.gov.au/v1/gtfs/vehiclepos/sydneytrains' --database="postgresql://localhost/test" --apikey="XXX" -m "sydneytrains" -c -1 &
python gtfsrdb_tfnsw.py -t 'https://api.transport.nsw.gov.au/v1/gtfs/realtime/sydneytrains' --database="postgresql://localhost/test" --apikey="XXX" -m "sydneytrains" -c -1 &
python gtfsrdb_tfnsw.py -a 'https://api.transport.nsw.gov.au/v1/gtfs/alerts/sydneytrains' --database="postgresql://localhost/test" --apikey="XXX" -m "sydneytrains" -c -1 &

#Ferries Real Time
python gtfsrdb_tfnsw.py -p 'https://api.transport.nsw.gov.au/v1/gtfs/vehiclepos/ferries' --database="postgresql://localhost/test" --apikey="XXX" -m "ferries" -c -1 &
python gtfsrdb_tfnsw.py -t 'https://api.transport.nsw.gov.au/v1/gtfs/realtime/ferries' --database="postgresql://localhost/test" --apikey="XXX" -m "ferries" -c -1 &
python gtfsrdb_tfnsw.py -a 'https://api.transport.nsw.gov.au/v1/gtfs/alerts/ferries' --database="postgresql://localhost/test" --apikey="XXX" -m "ferries" -c -1 &

#lightrail Real Time
python gtfsrdb_tfnsw.py -p 'https://api.transport.nsw.gov.au/v1/gtfs/vehiclepos/lightrail' --database="postgresql://localhost/test" --apikey="XXX" -m "lightrail" -c -1 &
python gtfsrdb_tfnsw.py -t 'https://api.transport.nsw.gov.au/v1/gtfs/realtime/lightrail' --database="postgresql://localhost/test" --apikey="XXX" -m "lightrail" -c -1 &
python gtfsrdb_tfnsw.py -a 'https://api.transport.nsw.gov.au/v1/gtfs/alerts/lightrail' --database="postgresql://localhost/test" --apikey="XXX" -m "lightrail" -c -1 &

#nswtrains Real Time
python gtfsrdb_tfnsw.py -p 'https://api.transport.nsw.gov.au/v1/gtfs/vehiclepos/nswtrains' --database="postgresql://localhost/test" --apikey="XXX" -m "nswtrains" -c -1 &
python gtfsrdb_tfnsw.py -t 'https://api.transport.nsw.gov.au/v1/gtfs/realtime/nswtrains' --database="postgresql://localhost/test" --apikey="XXX" -m "nswtrains" -c -1 &
python gtfsrdb_tfnsw.py -a 'https://api.transport.nsw.gov.au/v1/gtfs/alerts/nswtrains' --database="postgresql://localhost/test" --apikey="XXX" -m "nswtrains" -c -1 &

Това е, което поставих в crontab:

# GTFSR to Database
* * * * * ( /bin/bash /home/amarinS/projects/TfNSW_GTFSRDB/GTFSR_call)
* * * * * ( sleep 30 ; /bin/bash /home/amarinS/projects/TfNSW_GTFSRDB/GTFSR_call)

Ако стартирам /bin/bash /home/amarinS/projects/TfNSW_GTFSRDB/GTFSR_call ръчно, bash скриптът работи добре. Но нищо не се случва, когато заданието се изпълнява през CRONTAB.

Моля помогнете.

наздраве!