Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/column.man

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+.TH column "" "" "/rdb Command"
+.PC "display columns of a table in any order"
+\fBcolumn [ \fIColumn ...\fB ] < \fItableorlist\fR
+.PP
+.II "column^select"
+.II "column^reorder"
+.II "select columns"
+.II "reorder columns"
+The command
+.B column
+reads
+.I tableorlist
+and writes a new table (or list) that consists
+of each
+.IR Column ,
+in the order you list them
+on the command line.
+.PP
+If you give a column name that is not one of the columns for
+.IR tableorlist ,
+.B column
+creates a new column with that name, in that
+location, and leaves it empty.
+This lets you to create new columns.
+If you want to compute a column that does not exist, use this
+.B column
+facility to create it, then use the
+.B compute
+command to compute it.
+However, if you misspell a column name, you will get an empty column.
+.PP
+If you name no
+.I Column
+on the command line,
+.B column
+writes all of
+.I tableorlist
+to the standard output without change.
+.SH Example
+Assume that you have an inventory table, as follows:
+.DM
+Item   Amount    Cost   Value   Description
+----   ------   -----   -----   -----------
+   1        3    5.00       0   rubber gloves
+   2      100    0.50       0   test tubes
+   3        5    8.00       0   clamps
+   4       23    1.98       0   plates
+   5       99    2.45       0   cleaning cloth
+   6       89   14.75       0   bunsen burners
+   7        5     175       0   scales
+.DE
+.PP
+The command:
+.DM
+	column Cost Amount Description < inventory
+.DE
+.PP
+produces the following output:
+.DM
+ Cost   Amount   Description
+-----   ------   -----------
+ 5.00        3   rubber gloves
+ 0.50      100   test tubes
+ 8.00        5   clamps
+ 1.98       23   plates
+ 2.45       99   cleaning cloth
+14.75       89   bunsen burners
+  175        5   scales
+.DE
+.PP
+Note that the columns
+.B Cost
+and
+.B Amount
+have been reversed.
+We only have the columns we asked for and in the order we requested.
+.PP
+.B column
+can also manipulate list-formatted files.
+For example, the mailing list called
+.I maillist
+looks like this:
+.DM
+Number   1
+Name    Ronald McDonald
+Company McDonald's
+Street  123 Mac Attack
+City    Memphis
+State   TENN
+ZIP     30000
+Phone   (111) 222-3333
+.sp
+Number  2
+Name    Chiquita  Banana
+Company United Brands
+Street  Uno Avenido de la Reforma
+City    San Jose
+State   Costa Rica
+ZIP     123456789
+Phone   1234
+.DE
+.PP
+If you want only the names and numbers, type:
+.DM
+	column Name Phone < maillist
+.DE
+.PP
+This produces the following output:
+.DM
+Name    Ronald McDonald
+Phone   (111) 222-3333
+.sp
+Name    Chiquita  Banana
+Phone   1234
+.DE
+.SH "See Also"
+.B
+project,
+row
+.R
+.br
+COHERENT Lexicon:
+.B
+awk
+.R