### Test of -j filename
Usage:
parallel [options] [command [arguments]] < list_of_arguments
parallel [options] [command [arguments]] (::: arguments|:::: argfile(s))...
cat ... | parallel --pipe [options] [command [arguments]]

-j n       Run n jobs in parallel
-k         Keep same order
-X         Multiple arguments with context replace
--colsep regexp      Split input on regexp for positional replacements
{} {.} {/} {/.} {#}  Replacement strings
{3} {3.} {3/} {3/.}  Positional replacement strings

-S         sshlogin - e.g. foo@server.example.com
--trc {}.bar  Shorthand for --transfer --return {}.bar --cleanup
--onall    Run the given command with argument on all sshlogins
--nonall   Run the given command with no arguments on all sshlogins

--pipe     Split stdin (standard input) to multiple jobs.
--recend   Record end separator for --pipe.
--recstart Record start separator for --pipe.

See 'man parallel' for details
Parsing of --jobs/-j/--max-procs/-P failed
### Test of -j filename
sleep 0.7
sleep 0.8
sleep 0.9
sleep 0.4
sleep 0.6
### Test of -j filename with file content changing
sleep 3.3
sleep 1
sleep 1
sleep 1
sleep 1
sleep 1
sleep 1
sleep 1.1
sleep 1.2
sleep 1.3
sleep 1.4
sleep 1
sleep 1
sleep 1
sleep 1
sleep 1