I definitely sure that the syntax I am using in the crontab file is correct because I installed the same job on another host and it is working fine. The syntax is:
05 10 * * mon,wed,fri /app/aban/scripts/remove_log.sh >> /app/aban/scripts/remove.log 2>&1
Also, I tried this one:
* * * * * /app/aban/scripts/remove_log.sh
the error is :
crontab: installing new crontabempty one "/tmp/crontab.fuqF5D":0: bad minute errors in crontab file, can't install. Do you want to retry the same edit? n crontab: edits left in /tmp/crontab.fuqF5D
Please note that I have logged in as 'aban' user. I can install cronjobs on other hosts with the same user logged in.