Add crob jobs with the following lines in crob jobs
root@dspace#crontab -e

@hourly /home/dspace/bin/dspace itemcounter

@hourly /home/dspace/bin/dspace stats-util -f
@hourly /home/dspace/bin/dspace stats-util -i
@daily /home/dspace/bin/dspace stats-util -u
@daily /home/dspace/bin/dspace stats-util -m

@daily /home/dspace/bin/dspace update-discovery-index -o
@weekly /home/dspace/bin/dspace update-discovery-index -b -f
@monthly /home/dspace/bin/dspace update-discovery-index -c

@weekly /home/dspace/bin/dspace checker -u -d2h -p
@weekly /home/dspace/bin/dspace checker-emailer -a
@monthly /home/dspace/bin/dspace cleanup

10 0 * * * /home/dspace/bin/dspace embargo-lifter

0 1 * * * /home/dspace/bin/dspace sub-daily

10 1 * * * /home/dspace/bin/dspace stat-general
20 1 * * * /home/dspace/bin/dspace stat-monthly

10 2 * * * /home/dspace/bin/dspace stat-report-general
20 2 * * * /home/dspace/bin/dspace stat-report-monthly

@weekly /home/dspace/bin/dspace filter-media
0 3 * * * /home/dspace/bin/dspace index-update
0 6 * * * /home/dspace/bin/dspace generate-sitemaps