Linux ns1.utparral.edu.mx 6.8.0-79-generic #79~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 15 16:54:53 UTC 2 x86_64
Apache/2.4.58 (Unix) OpenSSL/1.1.1w PHP/8.2.12 mod_perl/2.0.12 Perl/v5.34.1
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[ HOME SHELL ]
Name
Size
Permission
Action
asn1parse.1
10.95
KB
-rw-r--r--
autopoint.1
1.25
KB
-rw-r--r--
bmp2tiff.1
2.7
KB
-rw-r--r--
bsqldb.1
3.46
KB
-rw-r--r--
bsqlodbc.1
2.44
KB
-rw-r--r--
ca.1
32.7
KB
-rw-r--r--
CA.pl.1
12.08
KB
-rw-r--r--
ciphers.1
37.32
KB
-rw-r--r--
cjpeg.1
13.58
KB
-rw-r--r--
cms.1
31.95
KB
-rw-r--r--
corelist.1
9.57
KB
-rw-r--r--
cpan.1
13.56
KB
-rw-r--r--
c_rehash.1
8.57
KB
-rw-r--r--
crl.1
7.5
KB
-rw-r--r--
crl2pkcs7.1
7.27
KB
-rw-r--r--
curl.1
115.49
KB
-rw-r--r--
curl-config.1
4.1
KB
-rw-r--r--
cwebp.1
12.42
KB
-rw-r--r--
datacopy.1
2.49
KB
-rw-r--r--
dbilogstrip.1
5.25
KB
-r--r--r--
dbiprof.1
8.13
KB
-r--r--r--
dbiproxy.1
9.43
KB
-r--r--r--
defncopy.1
2.7
KB
-rw-r--r--
derb.1
4.8
KB
-rw-r--r--
dgst.1
11.63
KB
-rw-r--r--
dhparam.1
9.1
KB
-rw-r--r--
djpeg.1
7.57
KB
-rw-r--r--
dsa.1
9.78
KB
-rw-r--r--
dsaparam.1
7.82
KB
-rw-r--r--
dwebp.1
4.66
KB
-rw-r--r--
ec.1
10.64
KB
-rw-r--r--
ecparam.1
9.96
KB
-rw-r--r--
enc.1
19.46
KB
-rw-r--r--
enc2xs.1
12.59
KB
-rw-r--r--
encguess.1
6.07
KB
-rw-r--r--
engine.1
7.18
KB
-rw-r--r--
envsubst.1
1.79
KB
-rw-r--r--
errstr.1
4.97
KB
-rw-r--r--
fax2ps.1
4.62
KB
-rw-r--r--
fax2tiff.1
7.78
KB
-rw-r--r--
fisql.1
4.54
KB
-rw-r--r--
flex.1
3.63
KB
-rw-r--r--
freebcp.1
6.12
KB
-rw-r--r--
ftpasswd.1
916
B
-rw-r--r--
ftpcount.1
1.65
KB
-rw-r--r--
ftpmail.1
3.44
KB
-rw-r--r--
ftpquota.1
958
B
-rw-r--r--
ftptop.1
2.16
KB
-rw-r--r--
ftpwho.1
2.15
KB
-rw-r--r--
genbrk.1
2.89
KB
-rw-r--r--
gencfu.1
2.4
KB
-rw-r--r--
gencnval.1
2.34
KB
-rw-r--r--
gendict.1
3.32
KB
-rw-r--r--
gendsa.1
6.96
KB
-rw-r--r--
genpkey.1
15.69
KB
-rw-r--r--
genrb.1
3.82
KB
-rw-r--r--
genrsa.1
8.06
KB
-rw-r--r--
GET.1
9.36
KB
-r--r--r--
gettext.1
2.1
KB
-rw-r--r--
gettextize.1
1.5
KB
-rw-r--r--
gif2tiff.1
2.55
KB
-rw-r--r--
h2load.1
12.65
KB
-rw-r--r--
h2ph.1
7.53
KB
-rw-r--r--
h2xs.1
20.31
KB
-rw-r--r--
HEAD.1
9.36
KB
-r--r--r--
iconv.1
4.13
KB
-rw-r--r--
icu-config.1
7.28
KB
-rw-r--r--
instmodsh.1
4.27
KB
-r--r--r--
jpegtran.1
9.79
KB
-rw-r--r--
json_pp.1
6.88
KB
-rw-r--r--
ldapadd.1
8.66
KB
-rw-r--r--
ldapcompare.1
6.58
KB
-rw-r--r--
ldapdelete.1
6.61
KB
-rw-r--r--
ldapexop.1
6.06
KB
-rw-r--r--
ldapmodify.1
8.66
KB
-rw-r--r--
ldapmodrdn.1
6.78
KB
-rw-r--r--
ldappasswd.1
5.85
KB
-rw-r--r--
ldapsearch.1
13.99
KB
-rw-r--r--
ldapurl.1
4.05
KB
-rw-r--r--
ldapwhoami.1
4.91
KB
-rw-r--r--
libnetcfg.1
5.71
KB
-rw-r--r--
list.1
6.35
KB
-rw-r--r--
lwp-download.1
5.51
KB
-r--r--r--
lwp-mirror.1
4.95
KB
-r--r--r--
lwp-request.1
9.37
KB
-r--r--r--
lwp-rget.1
8.61
KB
-r--r--r--
makeconv.1
3.28
KB
-rw-r--r--
msgattrib.1
4.25
KB
-rw-r--r--
msgcat.1
4.22
KB
-rw-r--r--
msgcmp.1
2.23
KB
-rw-r--r--
msgcomm.1
3.98
KB
-rw-r--r--
msgconv.1
3.12
KB
-rw-r--r--
msgen.1
3.17
KB
-rw-r--r--
msgexec.1
2.1
KB
-rw-r--r--
msgfilter.1
3.67
KB
-rw-r--r--
msgfmt.1
5.93
KB
-rw-r--r--
msggrep.1
5.11
KB
-rw-r--r--
msginit.1
2.6
KB
-rw-r--r--
msgmerge.1
4.9
KB
-rw-r--r--
msgunfmt.1
3.91
KB
-rw-r--r--
msguniq.1
3.86
KB
-rw-r--r--
ngettext.1
2.14
KB
-rw-r--r--
nghttp.1
8.54
KB
-rw-r--r--
nghttpd.1
5.27
KB
-rw-r--r--
nghttpx.1
62.77
KB
-rw-r--r--
nseq.1
6.25
KB
-rw-r--r--
ocsp.1
23.59
KB
-rw-r--r--
openssl.1
21.09
KB
-rw-r--r--
openssl-asn1parse.1
10.95
KB
-rw-r--r--
openssl-ca.1
32.7
KB
-rw-r--r--
openssl-ciphers.1
37.32
KB
-rw-r--r--
openssl-cms.1
31.95
KB
-rw-r--r--
openssl-c_rehash.1
8.57
KB
-rw-r--r--
openssl-crl.1
7.5
KB
-rw-r--r--
openssl-crl2pkcs7.1
7.27
KB
-rw-r--r--
openssl-dgst.1
11.63
KB
-rw-r--r--
openssl-dhparam.1
9.1
KB
-rw-r--r--
openssl-dsa.1
9.78
KB
-rw-r--r--
openssl-dsaparam.1
7.82
KB
-rw-r--r--
openssl-ec.1
10.64
KB
-rw-r--r--
openssl-ecparam.1
9.96
KB
-rw-r--r--
openssl-enc.1
19.46
KB
-rw-r--r--
openssl-engine.1
7.18
KB
-rw-r--r--
openssl-errstr.1
4.97
KB
-rw-r--r--
openssl-gendsa.1
6.96
KB
-rw-r--r--
openssl-genpkey.1
15.69
KB
-rw-r--r--
openssl-genrsa.1
8.06
KB
-rw-r--r--
openssl-list.1
6.35
KB
-rw-r--r--
openssl-nseq.1
6.25
KB
-rw-r--r--
openssl-ocsp.1
23.59
KB
-rw-r--r--
openssl-passwd.1
7.18
KB
-rw-r--r--
openssl-pkcs12.1
17.9
KB
-rw-r--r--
openssl-pkcs7.1
7.11
KB
-rw-r--r--
openssl-pkcs8.1
15.66
KB
-rw-r--r--
openssl-pkey.1
8.81
KB
-rw-r--r--
openssl-pkeyparam.1
6.18
KB
-rw-r--r--
openssl-pkeyutl.1
15.88
KB
-rw-r--r--
openssl-prime.1
5.38
KB
-rw-r--r--
openssl-rand.1
6.68
KB
-rw-r--r--
openssl-rehash.1
8.57
KB
-rw-r--r--
openssl-req.1
29.78
KB
-rw-r--r--
openssl-rsa.1
10.42
KB
-rw-r--r--
openssl-rsautl.1
10.7
KB
-rw-r--r--
openssl-s_client.1
36.29
KB
-rw-r--r--
openssl-sess_id.1
8.86
KB
-rw-r--r--
openssl-smime.1
23.06
KB
-rw-r--r--
openssl-speed.1
7.02
KB
-rw-r--r--
openssl-spkac.1
8.53
KB
-rw-r--r--
openssl-srp.1
5.8
KB
-rw-r--r--
openssl-s_server.1
34.3
KB
-rw-r--r--
openssl-s_time.1
12.1
KB
-rw-r--r--
openssl-storeutl.1
7.48
KB
-rw-r--r--
openssl-ts.1
28.03
KB
-rw-r--r--
openssl-tsget.1
11.17
KB
-rw-r--r--
openssl-verify.1
33.23
KB
-rw-r--r--
openssl-version.1
5.36
KB
-rw-r--r--
openssl-x509.1
37.6
KB
-rw-r--r--
osql.1
2.07
KB
-rw-r--r--
pal2rgb.1
3.23
KB
-rw-r--r--
passwd.1
7.18
KB
-rw-r--r--
pcre-config.1
2.67
KB
-rw-r--r--
pcregrep.1
34.62
KB
-rw-r--r--
pcretest.1
48.1
KB
-rw-r--r--
perl.1
22.94
KB
-rw-r--r--
perl5004delta.1
72.94
KB
-rw-r--r--
perl5005delta.1
46.75
KB
-rw-r--r--
perl5100delta.1
74.08
KB
-rw-r--r--
perl5101delta.1
63.75
KB
-rw-r--r--
perl5120delta.1
114.62
KB
-rw-r--r--
perl5121delta.1
14.79
KB
-rw-r--r--
perl5122delta.1
14.99
KB
-rw-r--r--
perl5123delta.1
8.44
KB
-rw-r--r--
perl5124delta.1
7.97
KB
-rw-r--r--
perl5125delta.1
13.17
KB
-rw-r--r--
perl5140delta.1
172.4
KB
-rw-r--r--
perl5141delta.1
13.13
KB
-rw-r--r--
perl5142delta.1
12.09
KB
-rw-r--r--
perl5143delta.1
12.8
KB
-rw-r--r--
perl5144delta.1
11.68
KB
-rw-r--r--
perl5160delta.1
157
KB
-rw-r--r--
perl5161delta.1
10.71
KB
-rw-r--r--
perl5162delta.1
7.83
KB
-rw-r--r--
perl5163delta.1
8.44
KB
-rw-r--r--
perl5180delta.1
140.84
KB
-rw-r--r--
perl5181delta.1
11.06
KB
-rw-r--r--
perl5182delta.1
9.68
KB
-rw-r--r--
perl5184delta.1
8.88
KB
-rw-r--r--
perl5200delta.1
130.86
KB
-rw-r--r--
perl5201delta.1
15.78
KB
-rw-r--r--
perl5202delta.1
17.12
KB
-rw-r--r--
perl5203delta.1
14.02
KB
-rw-r--r--
perl5220delta.1
150.37
KB
-rw-r--r--
perl5221delta.1
15.59
KB
-rw-r--r--
perl5222delta.1
17.84
KB
-rw-r--r--
perl5223delta.1
13.16
KB
-rw-r--r--
perl5224delta.1
8.87
KB
-rw-r--r--
perl5240delta.1
77.32
KB
-rw-r--r--
perl5241delta.1
12.95
KB
-rw-r--r--
perl5242delta.1
8.54
KB
-rw-r--r--
perl5243delta.1
16.24
KB
-rw-r--r--
perl5244delta.1
8.98
KB
-rw-r--r--
perl5260delta.1
111.52
KB
-rw-r--r--
perl5261delta.1
12.66
KB
-rw-r--r--
perl5262delta.1
12.65
KB
-rw-r--r--
perl5263delta.1
11.33
KB
-rw-r--r--
perl5280delta.1
84.7
KB
-rw-r--r--
perl5281delta.1
9.09
KB
-rw-r--r--
perl5282delta.1
10.84
KB
-rw-r--r--
perl5283delta.1
9.63
KB
-rw-r--r--
perl5300delta.1
49.94
KB
-rw-r--r--
perl5301delta.1
10.21
KB
-rw-r--r--
perl5302delta.1
9.15
KB
-rw-r--r--
perl5303delta.1
9.51
KB
-rw-r--r--
perl5320delta.1
65.25
KB
-rw-r--r--
perl5321delta.1
11.58
KB
-rw-r--r--
perl5340delta.1
44.49
KB
-rw-r--r--
perl5341delta.1
8.27
KB
-rw-r--r--
perl561delta.1
156.54
KB
-rw-r--r--
perl56delta.1
136.21
KB
-rw-r--r--
perl581delta.1
48.95
KB
-rw-r--r--
perl582delta.1
9.06
KB
-rw-r--r--
perl583delta.1
11.52
KB
-rw-r--r--
perl584delta.1
13.05
KB
-rw-r--r--
perl585delta.1
10.35
KB
-rw-r--r--
perl586delta.1
9.2
KB
-rw-r--r--
perl587delta.1
13.86
KB
-rw-r--r--
perl588delta.1
34.69
KB
-rw-r--r--
perl589delta.1
70.59
KB
-rw-r--r--
perl58delta.1
132.11
KB
-rw-r--r--
perlaix.1
26.98
KB
-rw-r--r--
perlamiga.1
11.37
KB
-rw-r--r--
perlandroid.1
12.94
KB
-rw-r--r--
perlapi.1
901.39
KB
-rw-r--r--
perlapio.1
26.41
KB
-rw-r--r--
perlartistic.1
11.5
KB
-rw-r--r--
perlbook.1
14.63
KB
-rw-r--r--
perlboot.1
4.19
KB
-rw-r--r--
perlbot.1
4.2
KB
-rw-r--r--
perlbs2000.1
13.07
KB
-rw-r--r--
perlbug.1
15.89
KB
-rw-r--r--
perlcall.1
66.92
KB
-rw-r--r--
perlcheat.1
8.59
KB
-rw-r--r--
perlclib.1
14.84
KB
-rw-r--r--
perlcn.1
8.21
KB
-rw-r--r--
perlcommunity.1
11.48
KB
-rw-r--r--
perlcygwin.1
34.92
KB
-rw-r--r--
perldata.1
59.36
KB
-rw-r--r--
perldbmfilter.1
9.6
KB
-rw-r--r--
perldebguts.1
51.63
KB
-rw-r--r--
perldebtut.1
29.77
KB
-rw-r--r--
perldebug.1
51.21
KB
-rw-r--r--
perldelta.1
8.26
KB
-rw-r--r--
perldeprecation.1
29.46
KB
-rw-r--r--
perldiag.1
401.65
KB
-rw-r--r--
perldoc.1
15.24
KB
-rw-r--r--
perldocstyle.1
53.28
KB
-rw-r--r--
perldos.1
15.76
KB
-rw-r--r--
perldsc.1
32.83
KB
-rw-r--r--
perldtrace.1
13.28
KB
-rw-r--r--
perlebcdic.1
97.39
KB
-rw-r--r--
perlembed.1
45.84
KB
-rw-r--r--
perlexperiment.1
15.46
KB
-rw-r--r--
perlfaq.1
28.79
KB
-rw-r--r--
perlfaq1.1
19.18
KB
-rw-r--r--
perlfaq2.1
14.29
KB
-rw-r--r--
perlfaq3.1
47.17
KB
-rw-r--r--
perlfaq4.1
109.05
KB
-rw-r--r--
perlfaq5.1
67.54
KB
-rw-r--r--
perlfaq6.1
49.07
KB
-rw-r--r--
perlfaq7.1
46.93
KB
-rw-r--r--
perlfaq8.1
62.56
KB
-rw-r--r--
perlfaq9.1
21.11
KB
-rw-r--r--
perlfilter.1
28.15
KB
-rw-r--r--
perlfork.1
18.88
KB
-rw-r--r--
perlform.1
22.32
KB
-rw-r--r--
perlfreebsd.1
5.63
KB
-rw-r--r--
perlfunc.1
433.03
KB
-rw-r--r--
perlgit.1
38.47
KB
-rw-r--r--
perlglossary.1
160.35
KB
-rw-r--r--
perlgov.1
19.15
KB
-rw-r--r--
perlgpl.1
17.94
KB
-rw-r--r--
perlguts.1
195.97
KB
-rw-r--r--
perlhack.1
52.01
KB
-rw-r--r--
perlhacktips.1
68.2
KB
-rw-r--r--
perlhacktut.1
10.88
KB
-rw-r--r--
perlhaiku.1
5.37
KB
-rw-r--r--
perlhist.1
64.26
KB
-rw-r--r--
perlhpux.1
37.33
KB
-rw-r--r--
perlhurd.1
5.96
KB
-rw-r--r--
perlintern.1
113.25
KB
-rw-r--r--
perlinterp.1
42.17
KB
-rw-r--r--
perlintro.1
28.76
KB
-rw-r--r--
perliol.1
45.31
KB
-rw-r--r--
perlipc.1
81.15
KB
-rw-r--r--
perlirix.1
8.84
KB
-rw-r--r--
perlivp.1
7.07
KB
-rw-r--r--
perljp.1
10.94
KB
-rw-r--r--
perlko.1
12.65
KB
-rw-r--r--
perllexwarn.1
4.29
KB
-rw-r--r--
perllinux.1
6.01
KB
-rw-r--r--
perllocale.1
88.6
KB
-rw-r--r--
perllol.1
14.78
KB
-rw-r--r--
perlmacos.1
4.83
KB
-rw-r--r--
perlmacosx.1
16.85
KB
-rw-r--r--
perlmod.1
33.42
KB
-rw-r--r--
perlmodinstall.1
15.45
KB
-rw-r--r--
perlmodlib.1
102.87
KB
-rw-r--r--
perlmodstyle.1
28.83
KB
-rw-r--r--
perlmroapi.1
7.66
KB
-rw-r--r--
perlnetware.1
10.88
KB
-rw-r--r--
perlnewmod.1
16.12
KB
-rw-r--r--
perlnumber.1
13.46
KB
-rw-r--r--
perlobj.1
44.56
KB
-rw-r--r--
perlootut.1
34.2
KB
-rw-r--r--
perlop.1
176.42
KB
-rw-r--r--
perlopenbsd.1
5.1
KB
-rw-r--r--
perlopentut.1
20.99
KB
-rw-r--r--
perlos2.1
112.91
KB
-rw-r--r--
perlos390.1
22.36
KB
-rw-r--r--
perlos400.1
9.05
KB
-rw-r--r--
perlpacktut.1
62.27
KB
-rw-r--r--
perlperf.1
57.75
KB
-rw-r--r--
perlplan9.1
9.45
KB
-rw-r--r--
perlpod.1
30.4
KB
-rw-r--r--
perlpodspec.1
78.17
KB
-rw-r--r--
perlpodstyle.1
16.93
KB
-rw-r--r--
perlpolicy.1
30.73
KB
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perlport.1
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Code Editor : perldbmfilter.1
.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" perldbmfilter \- Perl DBM Filters .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& $db = tie %hash, \*(AqDBM\*(Aq, ... \& \& $old_filter = $db\->filter_store_key ( sub { ... } ); \& $old_filter = $db\->filter_store_value( sub { ... } ); \& $old_filter = $db\->filter_fetch_key ( sub { ... } ); \& $old_filter = $db\->filter_fetch_value( sub { ... } ); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The four \f(CW\*(C`filter_*\*(C'\fR methods shown above are available in all the \s-1DBM\s0 modules that ship with Perl, namely DB_File, GDBM_File, NDBM_File, ODBM_File and SDBM_File. .PP Each of the methods works identically, and is used to install (or uninstall) a single \s-1DBM\s0 Filter. The only difference between them is the place that the filter is installed. .PP To summarise: .IP "\fBfilter_store_key\fR" 5 .IX Item "filter_store_key" If a filter has been installed with this method, it will be invoked every time you write a key to a \s-1DBM\s0 database. .IP "\fBfilter_store_value\fR" 5 .IX Item "filter_store_value" If a filter has been installed with this method, it will be invoked every time you write a value to a \s-1DBM\s0 database. .IP "\fBfilter_fetch_key\fR" 5 .IX Item "filter_fetch_key" If a filter has been installed with this method, it will be invoked every time you read a key from a \s-1DBM\s0 database. .IP "\fBfilter_fetch_value\fR" 5 .IX Item "filter_fetch_value" If a filter has been installed with this method, it will be invoked every time you read a value from a \s-1DBM\s0 database. .PP You can use any combination of the methods from none to all four. .PP All filter methods return the existing filter, if present, or \f(CW\*(C`undef\*(C'\fR if not. .PP To delete a filter pass \f(CW\*(C`undef\*(C'\fR to it. .SS "The Filter" .IX Subsection "The Filter" When each filter is called by Perl, a local copy of \f(CW$_\fR will contain the key or value to be filtered. Filtering is achieved by modifying the contents of \f(CW$_\fR. The return code from the filter is ignored. .SS "An Example: the \s-1NULL\s0 termination problem." .IX Subsection "An Example: the NULL termination problem." \&\s-1DBM\s0 Filters are useful for a class of problems where you \fIalways\fR want to make the same transformation to all keys, all values or both. .PP For example, consider the following scenario. You have a \s-1DBM\s0 database that you need to share with a third-party C application. The C application assumes that \fIall\fR keys and values are \s-1NULL\s0 terminated. Unfortunately when Perl writes to \s-1DBM\s0 databases it doesn't use \s-1NULL\s0 termination, so your Perl application will have to manage \s-1NULL\s0 termination itself. When you write to the database you will have to use something like this: .PP .Vb 1 \& $hash{"$key\e0"} = "$value\e0"; .Ve .PP Similarly the \s-1NULL\s0 needs to be taken into account when you are considering the length of existing keys/values. .PP It would be much better if you could ignore the \s-1NULL\s0 terminations issue in the main application code and have a mechanism that automatically added the terminating \s-1NULL\s0 to all keys and values whenever you write to the database and have them removed when you read from the database. As I'm sure you have already guessed, this is a problem that \s-1DBM\s0 Filters can fix very easily. .PP .Vb 4 \& use strict; \& use warnings; \& use SDBM_File; \& use Fcntl; \& \& my %hash; \& my $filename = "filt"; \& unlink $filename; \& \& my $db = tie(%hash, \*(AqSDBM_File\*(Aq, $filename, O_RDWR|O_CREAT, 0640) \& or die "Cannot open $filename: $!\en"; \& \& # Install DBM Filters \& $db\->filter_fetch_key ( sub { s/\e0$// } ); \& $db\->filter_store_key ( sub { $_ .= "\e0" } ); \& $db\->filter_fetch_value( \& sub { no warnings \*(Aquninitialized\*(Aq; s/\e0$// } ); \& $db\->filter_store_value( sub { $_ .= "\e0" } ); \& \& $hash{"abc"} = "def"; \& my $a = $hash{"ABC"}; \& # ... \& undef $db; \& untie %hash; .Ve .PP The code above uses SDBM_File, but it will work with any of the \s-1DBM\s0 modules. .PP Hopefully the contents of each of the filters should be self-explanatory. Both \*(L"fetch\*(R" filters remove the terminating \s-1NULL,\s0 and both \*(L"store\*(R" filters add a terminating \s-1NULL.\s0 .SS "Another Example: Key is a C int." .IX Subsection "Another Example: Key is a C int." Here is another real-life example. By default, whenever Perl writes to a \s-1DBM\s0 database it always writes the key and value as strings. So when you use this: .PP .Vb 1 \& $hash{12345} = "something"; .Ve .PP the key 12345 will get stored in the \s-1DBM\s0 database as the 5 byte string \&\*(L"12345\*(R". If you actually want the key to be stored in the \s-1DBM\s0 database as a C int, you will have to use \f(CW\*(C`pack\*(C'\fR when writing, and \f(CW\*(C`unpack\*(C'\fR when reading. .PP Here is a \s-1DBM\s0 Filter that does it: .PP .Vb 6 \& use strict; \& use warnings; \& use DB_File; \& my %hash; \& my $filename = "filt"; \& unlink $filename; \& \& \& my $db = tie %hash, \*(AqDB_File\*(Aq, $filename, O_CREAT|O_RDWR, 0666, \& $DB_HASH or die "Cannot open $filename: $!\en"; \& \& $db\->filter_fetch_key ( sub { $_ = unpack("i", $_) } ); \& $db\->filter_store_key ( sub { $_ = pack ("i", $_) } ); \& $hash{123} = "def"; \& # ... \& undef $db; \& untie %hash; .Ve .PP The code above uses DB_File, but again it will work with any of the \&\s-1DBM\s0 modules. .PP This time only two filters have been used; we only need to manipulate the contents of the key, so it wasn't necessary to install any value filters. .SH "SEE ALSO" .IX Header "SEE ALSO" DB_File, GDBM_File, NDBM_File, ODBM_File and SDBM_File. .SH "AUTHOR" .IX Header "AUTHOR" Paul Marquess
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