Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/rmblank.man

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+.TH rmblank "" "" "/rdb Command"
+.PC "Remove blank rows from a table"
+\fBrmblank < \fItable\fR
+.PP
+.II "row^delete blank"
+.II "blank row^delete"
+.II delete
+.II replace
+The command
+.B rmblank
+deletes from
+.I table
+all input rows that consist of only white space (spaces and tabs).
+The related programs
+.B delete
+and
+.B replace
+blank out records.
+They can be used in transaction processing where the files
+are too large to process and several users are updating them.
+At a quiet time, the files can be compacted and reindexed.
+.PP
+Be sure to reindex any file that is processed by either
+.B rmblank
+or
+.B compress.
+.SH Example
+First we have table
+.BR inventory ,
+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
+Then we delete record 4
+.DM
+	echo 4 | delete inventory Item
+.DE
+.PP
+and
+.B inventory
+now 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
+                                      
+   5        99    24     2376   cleaning cloth
+   6        89   147    13083   bunsen burners
+   7         5   175      875   scales
+.DE
+.PP
+The command
+.B see
+shows the contents of
+.B inventory
+actually to be as follows:
+.DM
+Item^IAmount^ICost^IValue^IDescription   $
+----^I------^I----^I-----^I--------------$
+   1^I     3^I  50^I  150^Irubber gloves$
+   2^I   100^I   5^I  500^Itest tubes$
+   3^I     5^I  80^I  400^Iclamps$
+    ^I      ^I    ^I     ^I      $
+   5^I    99^I  24^I 2376^Icleaning cloth$
+   6^I    89^I 147^I13083^Ibunsen burners$
+   7^I     5^I 175^I  875^Iscales$
+.DE
+.PP
+Now the command
+.DM
+	rmblank < inventory
+.DE
+.PP
+removes lines that consist only of blanks.
+After we run this command,
+.B inventory
+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
+   5        99    24     2376   cleaning cloth
+   6        89   147    13083   bunsen burners
+   7         5   175      875   scales
+.DE
+.PP
+Remember to reindex a file after you run
+.B rmblank
+on it.
+.SH "See Also"
+.B
+compress,
+delete,
+index,
+replace,
+rmblank
+.R
+.SO rmblank