This is the source used for Slackware 2.0.0. To look for a particular bit of source (let's say for 'cp'), first you would look for the full path: fuzzy:~# which cp /bin/cp Then, you grep for the package it came from. Note that the leading '/' is removed: fuzzy:~# grep bin/cp /var/adm/packages/* /var/adm/packages/bin:bin/cp /var/adm/packages/cpio:bin/cpio /var/adm/packages/perl:usr/bin/cppstdin From this, you can see that 'cp' came from the bin.tgz package. The source will be found in a corresponding subdirectory. In this case, that would be ./a/bin. Also, note that most of the networking code is supplied "unported" - the newspak-2.2.tgz package in ./n has patches needed for some of these (mostly the news/mail software).