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+.help tlcol May2000 tables
+.nj
+.ih
+NAME
+tlcol -- Display column information.
+.ih
+USAGE
+tlcol table
+.ih
+DESCRIPTION
+This task is used to list column information for a table.  The output is
+written to STDOUT, which may be redirected to a file.  There will be one line
+of output for each column in the table, and each output line may contain the
+column name, data type, print format, and units.
+The first line of output for each table in the input list is the table
+name preceded by a # sign.
+
+The output from this task may be used as input to various tasks such
+as 'tcreate', 'tprint', and 'tproject'.
+.ih
+PARAMETERS
+.ls table [file name template]
+A list of tables for which column info is to be printed.
+.le
+.ls (nlist = 4) [integer, min=1, max=4]
+The number of items to list.
+The output will consist of 'nlist' columns,
+one line for each column that is defined in the table.
+The items listed out are column name (displayed for all 'nlist' values),
+data type (displayed if 'nlist' is 2 or higher),
+display format (if 'nlist' is 3 or higher),
+units (if 'nlist' is 4).
+If 'nlist = 1', only the column name will be displayed;
+the output list may be edited and used as input to
+'tprint', 'tdump,' 'tedit', 'tread', 'tproject', or 'tquery'.
+The default of 4 can be used to generate
+a column-description file for the 'tcreate' task.
+
+If a column contains an array of values at each row,
+rather than just a single element,
+the array size is shown in square brackets appended to the data type.
+.le
+.ih
+EXAMPLES
+1.  Display the names, data types, print formats, and units of all the
+columns in the table "example.tab":
+
+.nf
+	tt> tlcol example.tab
+.fi
+
+2.  Print (using the 'tprint' task) specific columns:
+.nf
+
+	tt> tlcol example.tab nlist=1 >colnames.lis
+	tt> edit colnames.lis
+        (Rearrange the column names and perhaps delete some of them.)
+	tt> tprint example.tab columns=@colnames.lis
+
+3.  Create a new table based on the columns in "example.tab":
+
+	tt> tlcol example.tab nlist=4 >colnames.lis
+	tt> edit colnames.lis
+        (Delete or modify some column descriptions and/or add new ones.)
+	tt> tcreate ex2.tab cdfile=colnames.lis ...
+.fi
+.ih
+BUGS
+.ih
+REFERENCES
+This task was written by Phil Hodge.
+.ih
+SEE ALSO
+tinfo, tcreate, tdump
+.endhelp