For example add into /etc/apt/sources.lists following lines:

# some coment
deb http://www.cecak.cz/debian/squeeze ./
[ICO]NameLast modifiedSizeDescription

[PARENTDIR]Parent Directory  -  
[DIR]php4/2012-09-06 10:31 -  
[   ]Override2015-12-25 16:01 0  
[TXT]HEADER.html2010-11-10 09:58 153  
[   ]postfix_2.7.1-1-loc1.dsc2010-11-10 09:55 957  
[   ]gmp_5.0.5+dfsg-2loc1.dsc2015-06-13 20:15 1.2K 
[   ]pdns_3.1-4.1loc1.dsc2015-06-13 09:30 1.5K 
[   ]pdns_3.1-4.1loc2.dsc2015-06-13 10:23 1.5K 
[   ]pdns_3.4.4-2~bpo7+1loc1.dsc2015-06-13 20:16 1.7K 
[   ]pdns_3.4.1-4+deb8u1loc1.dsc2015-06-13 20:16 1.7K 
[   ]dovecot_2.0.18-1loc1.dsc2015-12-25 15:56 2.0K 
[   ]pdns_3.4.4-2~bpo7+1.dsc2015-06-13 20:16 2.9K 
[   ]postfix_2.7.1-1-loc1_i386.changes2010-11-10 09:55 3.5K 
[   ]gmp_5.0.5+dfsg-2loc1_amd64.changes2015-06-13 20:15 4.1K 
[   ]pdns_3.1-4.1loc1_amd64.changes2015-06-13 09:30 4.4K 
[   ]pdns_3.1-4.1loc2_amd64.changes2015-06-13 10:23 4.5K 
[   ]pdns_3.4.4-2~bpo7+1loc1_amd64.changes2015-06-13 20:16 5.1K 
[   ]Packages.gz2015-12-25 16:01 6.1K 
[   ]dovecot_2.0.18-1loc1_amd64.changes2015-12-25 15:56 6.2K 
[   ]libgmp3-dev_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 13K 
[   ]gmp_5.0.5+dfsg-2loc1.diff.gz2015-06-13 20:15 19K 
[   ]lib32gmpxx4_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 20K 
[   ]libgmpxx4ldbl_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 21K 
[   ]dovecot-common_2.0.18-1loc1_all.deb2015-12-25 15:56 23K 
[   ]Packages2015-12-25 16:01 38K 
[   ]postfix-cdb_2.7.1-1-loc1_i386.deb2010-11-10 09:55 41K 
[   ]postfix-pcre_2.7.1-1-loc1_i386.deb2010-11-10 09:55 43K 
[   ]pdns-backend-sqlite3_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 43K 
[   ]postfix-mysql_2.7.1-1-loc1_i386.deb2010-11-10 09:55 43K 
[   ]postfix-pgsql_2.7.1-1-loc1_i386.deb2010-11-10 09:55 43K 
[   ]pdns_3.1-4.1loc1.debian.tar.gz2015-06-13 09:30 46K 
[   ]pdns-backend-mydns_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 47K 
[   ]pdns_3.1-4.1loc2.debian.tar.gz2015-06-13 10:23 47K 
[   ]postfix-ldap_2.7.1-1-loc1_i386.deb2010-11-10 09:55 48K 
[   ]pdns_3.4.4-2~bpo7+1loc1.debian.tar.gz2015-06-13 20:16 49K 
[   ]pdns_3.4.4-2~bpo7+1.debian.tar.gz2015-06-13 20:16 49K 
[   ]pdns-backend-pgsql_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 53K 
[   ]pdns-backend-mysql_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 53K 
[   ]pdns-backend-sqlite3_3.1-4.1loc1_amd64.deb2015-06-13 09:30 59K 
[   ]pdns-backend-sqlite3_3.1-4.1loc2_amd64.deb2015-06-13 10:23 59K 
[   ]pdns-backend-pipe_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 62K 
[   ]pdns-backend-sqlite_3.1-4.1loc1_amd64.deb2015-06-13 09:30 65K 
[   ]pdns-backend-sqlite_3.1-4.1loc2_amd64.deb2015-06-13 10:23 65K 
[   ]pdns-backend-geo_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 69K 
[   ]pdns-backend-lua_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 69K 
[   ]pdns_3.4.1-4+deb8u1loc1.debian.tar.gz2015-06-13 20:16 74K 
[   ]pdns-backend-mysql_3.1-4.1loc1_amd64.deb2015-06-13 09:30 79K 
[   ]pdns-backend-mysql_3.1-4.1loc2_amd64.deb2015-06-13 10:23 79K 
[   ]pdns-backend-pgsql_3.1-4.1loc1_amd64.deb2015-06-13 09:30 81K 
[   ]pdns-backend-pgsql_3.1-4.1loc2_amd64.deb2015-06-13 10:23 81K 
[   ]pdns-backend-pipe_3.1-4.1loc1_amd64.deb2015-06-13 09:30 88K 
[   ]pdns-backend-pipe_3.1-4.1loc2_amd64.deb2015-06-13 10:23 88K 
[   ]pdns-backend-geo_3.1-4.1loc1_amd64.deb2015-06-13 09:30 106K 
[   ]pdns-backend-geo_3.1-4.1loc2_amd64.deb2015-06-13 10:23 114K 
[   ]pdns-backend-lua_3.1-4.1loc1_amd64.deb2015-06-13 09:30 129K 
[   ]pdns-backend-lua_3.1-4.1loc2_amd64.deb2015-06-13 10:23 129K 
[   ]postfix-dev_2.7.1-1-loc1_all.deb2010-11-10 09:55 143K 
[   ]libgmp10-doc_5.0.5+dfsg-2loc1_all.deb2015-06-13 20:16 156K 
[   ]pdns-backend-remote_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 178K 
[   ]lib32gmp10_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 217K 
[   ]dovecot-sqlite_2.0.18-1loc1_amd64.deb2015-12-25 15:56 245K 
[   ]dovecot-gssapi_2.0.18-1loc1_amd64.deb2015-12-25 15:56 245K 
[   ]dovecot-mysql_2.0.18-1loc1_amd64.deb2015-12-25 15:56 246K 
[   ]dovecot-pgsql_2.0.18-1loc1_amd64.deb2015-12-25 15:56 249K 
[   ]dovecot-solr_2.0.18-1loc1_amd64.deb2015-12-25 15:56 253K 
[   ]dovecot-lmtpd_2.0.18-1loc1_amd64.deb2015-12-25 15:56 258K 
[   ]libgmp10_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 258K 
[   ]dovecot-ldap_2.0.18-1loc1_amd64.deb2015-12-25 15:56 259K 
[   ]dovecot-pop3d_2.0.18-1loc1_amd64.deb2015-12-25 15:56 265K 
[   ]lib32gmp-dev_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 279K 
[   ]dovecot-managesieved_2.0.18-1loc1_amd64.deb2015-12-25 15:56 289K 
[   ]pdns-backend-ldap_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 311K 
[   ]pdns-backend-ldap_3.1-4.1loc1_amd64.deb2015-06-13 09:30 319K 
[   ]pdns-backend-ldap_3.1-4.1loc2_amd64.deb2015-06-13 10:23 319K 
[   ]dovecot-imapd_2.0.18-1loc1_amd64.deb2015-12-25 15:56 321K 
[   ]dovecot-sieve_2.0.18-1loc1_amd64.deb2015-12-25 15:56 457K 
[   ]dovecot-dev_2.0.18-1loc1_amd64.deb2015-12-25 15:56 461K 
[   ]libgmp-dev_5.0.5+dfsg-2loc1_amd64.deb2015-06-13 20:16 607K 
[   ]postfix-doc_2.7.1-1-loc1_all.deb2010-11-10 09:55 1.0M 
[   ]libbotan-1.10-0_1.10.1-1~bpo60+1_amd64.deb2013-03-16 18:21 1.1M 
[   ]dovecot_2.0.18-1.debian.tar.gz2015-12-25 15:56 1.2M 
[   ]pdns_3.1.orig.tar.gz2015-06-13 11:28 1.2M 
[   ]dovecot_2.0.18-1loc1.debian.tar.gz2015-12-25 15:56 1.2M 
[   ]postfix_2.7.1-1-loc1_i386.deb2010-11-10 09:55 1.3M 
[   ]pdns-server_3.1-4.1loc1_amd64.deb2015-06-13 09:30 1.8M 
[   ]pdns-server_3.1-4.1loc2_amd64.deb2015-06-13 10:23 1.8M 
[   ]dovecot-core_2.0.18-1loc1_amd64.deb2015-12-25 15:56 2.1M 
[   ]gmp_5.0.5+dfsg.orig.tar.gz2015-06-13 20:16 2.7M 
[   ]pdns-server_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:16 3.0M 
[   ]dovecot-dbg_2.0.18-1loc1_amd64.deb2015-12-25 15:56 3.0M 
[   ]dovecot_2.0.18.orig.tar.gz2015-12-25 15:56 3.2M 
[   ]postfix_2.7.1-1-loc1.tar.gz2010-11-10 09:55 3.7M 
[   ]pdns-server-dbg_3.1-4.1loc1_amd64.deb2015-06-13 09:31 12M 
[   ]pdns-server-dbg_3.1-4.1loc2_amd64.deb2015-06-13 10:24 12M 
[   ]pdns-server-dbg_3.4.4-2~bpo7+1loc1_amd64.deb2015-06-13 20:18 19M 

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