I run the following command on macOS Catalina 10.15 seq -w 270000 | parallel -X touch
It reports the version number is 20200622, bugid: open3-GLOB(0x7fc72e7f7b98) The output is: touch 000001 000002 000003 000004 ... 261674 Extra info: parallel --max-line-len 261632 It seems to be mistaking the maximum number of characters in a command's parameters with the maximum number of parameters - when they are clearly different things. Thank you Mark Setchell