Provided by: stilts_3.1.5-1_all bug


       stilts-tpipe - Performs pipeline processing on a table


       stilts tpipe [ifmt=<in-format>] [istream=true|false] [in=<table>] [cmd=<cmds>]
                    [omode=out|meta|stats|count|cgi|discard|topcat|samp|tosql|gui] [out=<out-
                    table>] [ofmt=<out-format>]


       tpipe  performs  all kinds of general purpose manipulations which take one table as input.
       It is extremely flexible, and can do the following things amongst others:

         * calculate statistics

         * display metadata

         * select rows in various ways, including algebraically

         * define new columns as algebraic functions of old ones

         * delete or rearrange columns

         * sort rows

         * convert between table formats
        and combine these operations. You can think of it as a supercharged table copying tool.

       The basic operation of tpipe is that it reads  an  input  table,  performs  zero  or  more
       processing steps on it, and then does something with the output. There are therefore three
       classes of things you need to tell it when it runs:

       Input table location Specified by the in, ifmt and istream parameters.

       Processing steps Either provide a string giving steps as the value  of  one  or  more  cmd
       parameters,  or  the  name  of a file containing the steps using the script parameter. The
       steps that you can perform are described in SUN/256.

       Output table destination What happens to the output table is determined by  the  value  of
       the  omode  parameter.  By default, omode=out, in which case the table is written to a new
       table file in a format determined by ofmt. However, you  can  do  other  things  with  the
       result  such as calculate the per-column statistics (omode=stats), view only the table and
       column metadata (omode=meta), display  it  directly  in  TOPCAT  (omode=topcat)  etc.  See
       SUN/256 for a more detailed explanation of these ideas.

       The parameters mentioned above are listed in detail in the next section.


              Specifies  the  format  of  the input table as specified by parameter in. The known
              formats are listed in SUN/256. This flag can be used if you know what  format  your
              table is in. If it has the special value (auto) (the default), then an attempt will
              be made to detect the format of the table automatically. This cannot always be done
              correctly  however,  in  which  case the program will exit with an error explaining
              which formats were attempted.

              If set true, the input table specified by the  in  parameter  will  be  read  as  a
              stream.  It  is necessary to give the ifmt parameter in this case. Depending on the
              required operations and processing mode, this may cause the read to fail (sometimes
              it  is necessary to read the table more than once). It is not normally necessary to
              set this flag; in most cases the data will be streamed automatically if that is the
              best  thing  to  do.  However  it  can sometimes result in less resource usage when
              processing large files in certain formats (such as VOTable).

              The location of the input table. This may take one of the following forms:

                * A filename.

                * A URL.

                * The special value "-", meaning standard input. In this case  the  input  format
                  must  be  given  explicitly using the ifmt parameter. Note that not all formats
                  can be streamed in this way.

                * A system command line with either a "<"  character  at  the  start,  or  a  "|"
                  character at the end ("<syscmd" or "syscmd|"). This executes the given pipeline
                  and reads from its standard output. This will probably only work  on  unix-like
               In  any  case,  compressed data in one of the supported compression formats (gzip,
              Unix compress or bzip2) will be decompressed transparently.

              Specifies processing to be performed on the input table as specified  by  parameter
              in, before any other processing has taken place. The value of this parameter is one
              or more of the filter commands described in SUN/256. If more  than  one  is  given,
              they  must  be  separated  by  semicolon  characters  (";").  This parameter can be
              repeated multiple times on the same command line to build up a list  of  processing
              steps.  The  sequence of commands given in this way defines the processing pipeline
              which is performed on the table.

              Commands may alteratively be supplied in an external file, by using the indirection
              character  '@'. Thus a value of "@filename" causes the file filename to be read for
              a list of filter commands to execute. The commands in the file may be separated  by
              newline characters and/or semicolons, and lines which are blank or which start with
              a '#' character are ignored.

              The mode in which the result table will be output. The default mode is  out,  which
              means  that  the  result  will  be  written as a new table to disk or elsewhere, as
              determined by the out and ofmt parameters. However, there are other  possibilities,
              which correspond to uses to which a table can be put other than outputting it, such
              as displaying metadata, calculating statistics, or populating a  table  in  an  SQL
              database.  For  some  values of this parameter, additional parameters (<mode-args>)
              are required to determine the exact behaviour.

              Possible values are

                * out

                * meta

                * stats

                * count

                * cgi

                * discard

                * topcat

                * samp

                * tosql

                * gui
               Use the help=omode flag or see SUN/256 for more information.

              The location of the output table. This is usually a filename to write to. If it  is
              equal  to  the  special value "-" (the default) the output table will be written to
              standard output.

              This parameter must only be given if omode has its default value of "out".

              Specifies the format in which the output table will be written (one of the ones  in
              SUN/256 - matching is case-insensitive and you can use just the first few letters).
              If it has the special value "(auto)" (the default), then the output  filename  will
              be examined to try to guess what sort of file is required usually by looking at the
              extension. If it's not obvious from the filename what output format is intended, an
              error will result.

              This parameter must only be given if omode has its default value of "out".



       If  the  package  stilts-doc  is installed, the full documentation SUN/256 is available in
       HTML format:


       STILTS version 3.1-5-debian

       This is the Debian version of Stilts, which lack the support  of  some  file  formats  and
       network protocols. For differences see


       Mark Taylor (Bristol University)

                                             Mar 2017                             STILTS-TPIPE(1)