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Thanks. That got me off and running. I found a slightly different way of getting rid of the % sign, but there must be some elementary syntax error I'm making:

$ df -k | sed 's/%//' | awk if ($5 >...

I'm trying to monitor disk usage, using cron to run a script to email me when disk capacity exceeds 66%. When I use df (actually, "df -k" because I find the format useful), disk capacity shows as...