Translations:GNU Parallel/11/en
Keeping Track of Completed and Failed Commands, and Restart Capabilities
You can tell Gnu Parallel to keep track of which commands have completed by using the --joblog JOBLOGFILE argument. The file JOBLOGFILE will contain the list of completed commands, their start times, durations, hosts, and exit values. E.g.
[name@server ~]$ ls *.txt | parallel --joblog gzip.log gzip {}