ipset not executing from crontab

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http://unix.stackexchange.com – I have this txt files that contains IPs, one per line of file, that I want to block using ipset. I have this bash script that essentially reads from the plain txt file and constructs an array. Then it iterates the array elements and add each one to the ipset I have created for that purpose. The problem is this: if I execute the script manually from the terminal, it works perfectly, but when I add the script to run periodically using crontab, the script runs but the IPs are not added to the ipset. This is the relevant part of the script. index=0 while true; do ipset -quiet -A myIpset $[ar (HowTos)