usage (sample/psql.rb)

    # File sample/psql.rb, line 39
    def usage()
      printf("Usage: psql.rb [options] [dbname]\n")
      printf("\t -a authsvc              set authentication service\n")
      printf("\t -A                      turn off alignment when printing out attributes\n")
      printf("\t -c query                run single query (slash commands too)\n")
      printf("\t -d dbName               specify database name\n")
      printf("\t -e                      echo the query sent to the backend\n")
      printf("\t -f filename             use file as a source of queries\n")
      printf("\t -F sep                  set the field separator (default is \" \")\n")
      printf("\t -h host                 set database server host\n")
      printf("\t -H                      turn on html3.0 table output\n")
      printf("\t -l                      list available databases\n")
      printf("\t -n                      don't use readline library\n")
      printf("\t -o filename             send output to filename or (|pipe)\n")
      printf("\t -p port                 set port number\n")
      printf("\t -q                      run quietly (no messages, no prompts)\n")
      printf("\t -s                      single step mode (prompts for each query)\n")
      printf("\t -S                      single line mode (i.e. query terminated by newline)\n")
      printf("\t -t                      turn off printing of headings and row count\n")
      printf("\t -T html                 set html3.0 table command options (cf. -H)\n")
      printf("\t -x                      turn on expanded output (field names on left)\n")
      exit(1)
    end