Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/delete.man

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+.TH delete "" "" "/rdb Command"
+.PC "Blank record and update index file"
+\fBdelete  [-m[bhirs]] \fItable keycolumn ... \fB< \fIkeytable\fR
+.PP
+.II row^delete
+.II "delete row"
+The command
+.B delete
+writes a blank record on the row in
+.I table
+whose key matches the row in the
+.IR keytable .
+It also deletes the offset row in the appropriate fast-access
+offset table, or, in the case of the
+.B hash
+method, replaces the deleted offset with \-1.
+.PP
+Options
+.B \-m[bhirs]
+lets you select a type of fast-accessing to locate the row to delete.
+For information on the type of fast accessing that each option invokes,
+see the manual entry for
+.BR index .
+.SH Example
+Consider table
+.BR inventory ,
+which appears as follows:
+.DM
+Item    Amount  Cost    Value   Description   
+----    ------  ----    -----   --------------
+   1         3    50      150   rubber gloves
+   2       100     5      500   test tubes
+   3         5    80      400   clamps
+   4        23    19      437   plates
+   5        99    24     2376   cleaning cloth
+   6        89   147    13083   bunsen burners
+   7         5   175      875   scales
+.DE
+.PP
+The
+.B record
+index looks like this:
+.DM
+  Offset
+--------
+      76
+     113
+     147
+     177
+     207
+     245
+     283
+.DE
+.PP
+The following command deletes the first record
+.BR Item 1:
+.DM
+	echo 1 | delete -mr inventory Item
+.DE
+.PP
+.B inventory
+now appears as follows:
+.DM
+Item    Amount  Cost    Value   Description   
+----    ------  ----    -----   --------------
+                                             
+   2       100     5      500   test tubes
+   3         5    80      400   clamps
+   4        23    19      437   plates
+   5        99    24     2376   cleaning cloth
+   6        89   147    13083   bunsen burners
+   7         5   175      875   scales
+.DE
+.PP
+.B inventory.r
+now appears as follows:
+.DM
+  Offset
+--------
+     113
+     147
+     177
+     207
+     245
+     283
+.DE
+.PP
+Note that we have blanked out the record and removed the
+offset.
+.SH "See Also"
+.B
+append,
+index,
+replace
+.R
+.SO delete