As far as the following command is concerned: $ find ./source -type f | xargs sort -o bbb -u
Lew Pitcher told me that it has the following limitation [1]: The above command depends on xargs(1) to provide sort(1) with a list of input files. As the size of this list depends on both the number of files found, /and/ the maximum size of an argument vector (argv[]), there is a chance that the file bbb will only contain the sorted contents of a subset of the files found by find(1). [1] https://groups.google.com/g/comp.unix.shell/c/ha5t3U54GmY/m/M3tIUPtPBAAJ So, I want to know whether the parallel tool still has the similar problem. Regards, HZ