12-10-2001
This won't work so well for multiple truncations....
$ > 11*
bash: 11*: ambiguous redirect
Is provided when using any of the methods mentioned above. I think the redirection needs specific filename as it can be used to change create new files too.....
May not be as easy as above..... definitely would be a way with a for loop - however surely there is an easier way????? And I'm not even gonna try the for loop for you as I'm more likely to win a grammy than get it working...
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dbm(3) Library Functions Manual dbm(3)
NAME
dbminit, fetch, store, delete, firstkey, nextkey, forder - Database subroutines
LIBRARY
DBM Library (libdbm.a)
SYNOPSIS
#include <dbm.h>
typedef struct {
char *dptr;
int dsize; } datum;
int dbminit(
char *file );
datum fetch(
datum key );
int store(
datum key,
datum content );
int delete(
datum key );
datum firstkey( void );
datum nextkey(
datum key );
long forder(
datum key );
PARAMETERS
Specifies the database file. Specifies the key. Specifies a value associated with the key parameter.
DESCRIPTION
The dbminit(), fetch(), store(), delete(), firstkey(), nextkey(), and forder() functions maintain key/content pairs in a database. They
are obtained with the -ldbm loader option. The dbm library is provided only for backwards compatibility, having been obsoleted by the ndbm
functions in libc. See the manual page for ndbm for more information.
The dbminit(), fetch(), store(), delete(), firstkey(), nextkey(), and forder() functions handle very large databases (up to a billion
blocks) and access a keyed item in one or two file system accesses. Arbitrary binary data, as well as normal ASCII strings, are allowed.
The database is stored in two files. One file is a directory containing a bit map and has .dir as its suffix. The second file contains
all data and has .pag as its suffix.
Before a database can be accessed, it must be opened by the dbminit() function. At the time that dbminit() is called, the file.dir and
file.pag files must exist. (An empty database is created by creating zero-length .dir and .pag files.)
Once open, the data stored under a key is accessed by the fetch() function and data is placed under a key by the store() function. A key
(and its associated contents) is deleted by the delete() function. A linear pass through all keys in a database may be made by use of the
firstkey() and nextkey() functions. The firstkey() function returns the first key in the database. With any key, the nextkey() function
returns the next key in the database. The following code traverses the database: for (key = firstkey(); key.dptr != NULL; key = nex-
tkey(key))
RETURN VALUES
Upon successful completion, the functions that return an int return 0 (zero). Otherwise, a negative number is returned. The functions
that return a datum indicate errors with a null (0) dptr .
RELATED INFORMATION
Functions: ndbm(3) delim off
dbm(3)