How to tell gunzip to read the file when the output file is there

Hi Experts,

I want to create a new file if find command get some output, when i ran the below command I am getting the following error

# gunzip -c `find /home/guna/web3/ -iname "clk*" -cmin -66` >> /home/guna/$(date +%Y%h%d%H).log

gzip: compressed data not read from a terminal. Use -f to force decompression.

For help, type: gzip -h

because the output from find command there is no file generated in 66min, how to tell gunzip to read the file when find command found any file. when I see the log the error is below, the above command I am running as a cronjob.

# tail -f /var/mail/root

gzip: stdin: unexpected end of file

Please help me to get rid from this.

Thanks,

Kishore.

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