Some handy one-liner shell scripts.
Note: if you're on Windows, all of these tools are available 
as part of the free Cygwin tookkit (www.cygwin.com).
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# Delete all jobs matching the pattern "job=DELETEME*".
p4 jobs -e "job=DELETEME*" | cut -d " " -f 1 | xargs -n 1 p4 job -d