Convert event times to inter-event intervals

intervals [-o outfile -l# -x# -c# -V# -h] file(s)

-l number of values to be read (all)
-x number of values to be skipped (0)
-c column to be read (1 or file,#)
-o output file name, just -o means file_ss
-V verbosity level (0 = only fatal errors)
-h show this message

Takes a sequence of event times and differences it to give inter-event intervals. Output file file_ss.