.TH X2SYS_DATALIST l "1 Mar 2002"
.SH NAME
x2sys_datalist \- A generic data-extractor ascii or binary files
.SH SYNOPSIS
\fBx2sys_datalist\fP \fIfile(s)\fP [ \fB\-D\fP\fIdeffile\fP ]
[ \fB\-F\fP\fIname1,name2,...\fP ] [ \fB\-H\fP ] [ \fB\-M\fP[\fIflag\fP] ]
[ \fB\-R\fIwest/east/south/north\fP ] [ \fB\-V\fP ] [ \fB\-bo\fP[\fBs\fP][\fIn\fP] ]
.SH DESCRIPTION
x2sys_datalist reads one or more files and produces an ASCII [or binary] table.
The files can be of any format, which must be descriped and passed with the
\fB\-D\fP option. You may limit the output to a geographic region, and insist
that the output from several files be separated by a multiple segment header.
Only the named data fields will be output [Default is all columns].
.TP
\fIfiles\fP
Can be one or more binary or ASCII data files. To give a list of names,
use `cat list_of_files`.
.SH OPTIONS
No space between the option flag and the associated arguments
.TP
.B \-D
Definition file for this data set. [x2sys.def]
.TP
.B \-F
Give a comma-separated list of column names as defined in the definition
file. [Default is all data columns].
.TP
.B \-H
Input file(s) has Header record(s). Number of header records can be changed by editing
your \.gmtdefaults file. If used, \fBGMT\fP default is 1 header record.
.TP
.B \-V
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
.TP
.B \-bo
Selects binary output. Append \fBs\fP for single precision [Default is double].
.SH EXAMPLES
To extract all data from the old-style GMT MGG file c2104.gmt, try:
.br
.sp
x2sys_datalist c2104.gmt \fB\-D\fPgmt > myfile
.br
.sp
To make x,y,topo input for \fBblockmean\fP and \fBsurface\fP using all the files
listed in the file tracks.lis, but only the data that are inside the specified
area, and make output binary, try:
.br
.sp
x2sys_datalist `cat tracks.lis` \fB\-F\fPx,y,topo \fB\-R\fP-40/-30/25/35 \fB\-bo\fP > alltopo.xyz
.SH "SEE ALSO"
.IR blockmean (l),
.IR gmt (l),
.IR surface (l),
.IR x2sys_cross (l)