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

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

[DIR]Parent Directory  -
[TXT]HEADER.html10-Nov-2010 09:58 153
[   ]Override25-Dec-2015 16:01 0
[   ]Packages25-Dec-2015 16:01 38K
[   ]Packages.gz25-Dec-2015 16:01 6.1K
[   ]dovecot-common_2.0.18-1loc1_all.deb25-Dec-2015 15:56 23K
[   ]dovecot-core_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 2.1M
[   ]dovecot-dbg_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 3.0M
[   ]dovecot-dev_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 461K
[   ]dovecot-gssapi_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 245K
[   ]dovecot-imapd_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 321K
[   ]dovecot-ldap_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 259K
[   ]dovecot-lmtpd_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 258K
[   ]dovecot-managesieved_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 289K
[   ]dovecot-mysql_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 246K
[   ]dovecot-pgsql_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 249K
[   ]dovecot-pop3d_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 265K
[   ]dovecot-sieve_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 457K
[   ]dovecot-solr_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 253K
[   ]dovecot-sqlite_2.0.18-1loc1_amd64.deb25-Dec-2015 15:56 245K
[   ]dovecot_2.0.18-1.debian.tar.gz25-Dec-2015 15:56 1.2M
[   ]dovecot_2.0.18-1loc1.debian.tar.gz25-Dec-2015 15:56 1.2M
[   ]dovecot_2.0.18-1loc1.dsc25-Dec-2015 15:56 2.0K
[   ]dovecot_2.0.18-1loc1_amd64.changes25-Dec-2015 15:56 6.2K
[   ]dovecot_2.0.18.orig.tar.gz25-Dec-2015 15:56 3.2M
[   ]gmp_5.0.5+dfsg-2loc1.diff.gz13-Jun-2015 20:15 19K
[   ]gmp_5.0.5+dfsg-2loc1.dsc13-Jun-2015 20:15 1.2K
[   ]gmp_5.0.5+dfsg-2loc1_amd64.changes13-Jun-2015 20:15 4.1K
[   ]gmp_5.0.5+dfsg.orig.tar.gz13-Jun-2015 20:16 2.7M
[   ]lib32gmp-dev_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 279K
[   ]lib32gmp10_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 217K
[   ]lib32gmpxx4_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 20K
[   ]libbotan-1.10-0_1.10.1-1~bpo60+1_amd64.deb16-Mar-2013 18:21 1.1M
[   ]libgmp-dev_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 607K
[   ]libgmp3-dev_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 13K
[   ]libgmp10-doc_5.0.5+dfsg-2loc1_all.deb13-Jun-2015 20:16 156K
[   ]libgmp10_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 258K
[   ]libgmpxx4ldbl_5.0.5+dfsg-2loc1_amd64.deb13-Jun-2015 20:16 21K
[   ]pdns-backend-geo_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 106K
[   ]pdns-backend-geo_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 114K
[   ]pdns-backend-geo_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 69K
[   ]pdns-backend-ldap_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 319K
[   ]pdns-backend-ldap_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 319K
[   ]pdns-backend-ldap_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 311K
[   ]pdns-backend-lua_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 129K
[   ]pdns-backend-lua_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 129K
[   ]pdns-backend-lua_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 69K
[   ]pdns-backend-mydns_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 47K
[   ]pdns-backend-mysql_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 79K
[   ]pdns-backend-mysql_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 79K
[   ]pdns-backend-mysql_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 53K
[   ]pdns-backend-pgsql_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 81K
[   ]pdns-backend-pgsql_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 81K
[   ]pdns-backend-pgsql_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 53K
[   ]pdns-backend-pipe_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 88K
[   ]pdns-backend-pipe_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 88K
[   ]pdns-backend-pipe_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 62K
[   ]pdns-backend-remote_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 178K
[   ]pdns-backend-sqlite3_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 59K
[   ]pdns-backend-sqlite3_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 59K
[   ]pdns-backend-sqlite3_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 43K
[   ]pdns-backend-sqlite_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 65K
[   ]pdns-backend-sqlite_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 65K
[   ]pdns-server-dbg_3.1-4.1loc1_amd64.deb13-Jun-2015 09:31 12M
[   ]pdns-server-dbg_3.1-4.1loc2_amd64.deb13-Jun-2015 10:24 12M
[   ]pdns-server-dbg_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:18 19M
[   ]pdns-server_3.1-4.1loc1_amd64.deb13-Jun-2015 09:30 1.8M
[   ]pdns-server_3.1-4.1loc2_amd64.deb13-Jun-2015 10:23 1.8M
[   ]pdns-server_3.4.4-2~bpo7+1loc1_amd64.deb13-Jun-2015 20:16 3.0M
[   ]pdns_3.1-4.1loc1.debian.tar.gz13-Jun-2015 09:30 46K
[   ]pdns_3.1-4.1loc1.dsc13-Jun-2015 09:30 1.5K
[   ]pdns_3.1-4.1loc1_amd64.changes13-Jun-2015 09:30 4.4K
[   ]pdns_3.1-4.1loc2.debian.tar.gz13-Jun-2015 10:23 47K
[   ]pdns_3.1-4.1loc2.dsc13-Jun-2015 10:23 1.5K
[   ]pdns_3.1-4.1loc2_amd64.changes13-Jun-2015 10:23 4.5K
[   ]pdns_3.1.orig.tar.gz13-Jun-2015 11:28 1.2M
[   ]pdns_3.4.1-4+deb8u1loc1.debian.tar.gz13-Jun-2015 20:16 74K
[   ]pdns_3.4.1-4+deb8u1loc1.dsc13-Jun-2015 20:16 1.7K
[   ]pdns_3.4.4-2~bpo7+1.debian.tar.gz13-Jun-2015 20:16 49K
[   ]pdns_3.4.4-2~bpo7+1.dsc13-Jun-2015 20:16 2.9K
[   ]pdns_3.4.4-2~bpo7+1loc1.debian.tar.gz13-Jun-2015 20:16 49K
[   ]pdns_3.4.4-2~bpo7+1loc1.dsc13-Jun-2015 20:16 1.7K
[   ]pdns_3.4.4-2~bpo7+1loc1_amd64.changes13-Jun-2015 20:16 5.1K
[DIR]php4/06-Sep-2012 10:31 -
[   ]postfix-cdb_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 41K
[   ]postfix-dev_2.7.1-1-loc1_all.deb10-Nov-2010 09:55 143K
[   ]postfix-doc_2.7.1-1-loc1_all.deb10-Nov-2010 09:55 1.0M
[   ]postfix-ldap_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 48K
[   ]postfix-mysql_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 43K
[   ]postfix-pcre_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 43K
[   ]postfix-pgsql_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 43K
[   ]postfix_2.7.1-1-loc1.dsc10-Nov-2010 09:55 957
[   ]postfix_2.7.1-1-loc1.tar.gz10-Nov-2010 09:55 3.7M
[   ]postfix_2.7.1-1-loc1_i386.changes10-Nov-2010 09:55 3.5K
[   ]postfix_2.7.1-1-loc1_i386.deb10-Nov-2010 09:55 1.3M

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