/usr/bin/gvpr: warning: option -- unrecognized
/usr/bin/gvpr: warning: option -h unrecognized
/usr/bin/gvpr: warning: option -e unrecognized
/usr/bin/gvpr: warning: option -l unrecognized
/usr/bin/gvpr: warning: option -p unrecognized
/usr/bin/gvpr: No program supplied via argument or -f option
Usage: /usr/bin/gvpr  [-o <ofile>] [-a <args>] ([-f <prog>] | 'prog') [files]
   -c         - use source graph for output
   -f <pfile> - find program in file <pfile>
   -i         - create node induced subgraph
   -a <args>  - string arguments available as ARGV[0..]
   -o <ofile> - write output to <ofile>; stdout by default
   -n         - no read-ahead of input graphs
   -q         - turn off warning messages
   -v         - enable verbose messages
   -V         - print version info
   -?         - print usage info
If no files are specified, stdin is used