/etc/
|-- DIR_COLORS
|-- DIR_COLORS.xterm
    records: line,
    format: kw ' '+ \value, fixed kw + user extensions
    comments: #.*$
|-- acpi
|   |-- actions/*
|   `-- events/*
    shell scripts
|-- adjtime
    ???
|-- aliases
    records: line
    format: alias ':' redir
    comments: #.*$
|-- anacrontab
    format: crontab
|-- apt
    ???
|-- at.deny
    ???
|-- auto.master
    records: line
    format: key [ options ] location
    comments: #.*$
|-- auto.misc
    automounter map
|-- autofs_ldap_auth.conf
    XML
|-- avahi
    ??? some XML, some shell scripts
|-- blkid
|   |-- blkid.tab
    XML
|-- cron.d/*
    crontab with users
|-- cron.daily
    shell scripts
|-- cron.deny
    ???
|-- cron.hourly
    shell scripts
|-- cron.monthly
    shell scripts
|-- cron.weekly
    shell scripts
|-- crontab
    crontab with users
|-- cups
    custom
|-- dbus-1
    XML
|-- default
    sysconfig
|-- depmod.d/*
    records: line,
    format: kw ' '+ \value, fixed kw + user extensions
    comments: #.*$
|-- dev.d
    ???
|-- diskdump
    ???
|-- dnsmasq.conf
    records: line
    kw [ '=' value ]
    comments: #.*$
|-- dnsmasq.d/*
    ???
|-- environment
    ???
|-- exports
    records: line w/ continuation
    export_point ( ' ' client [ '(' option ( ',' option ) * ')' ] )
    comments: #.*$
|-- fedora-release
    freeform
|-- fstab
    records: line
    device ' \t'+ mount_point ' \t'+ fs [ option ( ',' option ) * ] freq passno
    comments: ^#.*$
|-- group
    POSIX
|-- grub.conf -> ../boot/grub/grub.conf
    records: line
    format: kw ' '+ value
    comments: #.*$
|-- gshadow
|-- hal
    ???
|-- host.conf
|-- hosts
    records: line
    format: ip_addr ' \t'+ (hostname [ ' \t'+ alias ] * )
    comments: #.*$
|-- hosts.allow
|-- hosts.deny
    ???
    records: line w/ continuation, ordered
    format: daemon_list ':' client_list [ ':' shell_command ]
    comments: #.*$
|-- htdig
|   `-- htdig.conf.rpmsave
|-- httpd
    custom
|-- idmapd.conf
    ini-style
|-- initlog.conf
    records: line
    format: kw ' '+ value
    comments: ^#.*$
|-- inittab
    records: line
    format: id ':' runlevels ':' action ':' process ':'
    comments: ^#.*$
|-- iscsi
    ???
|-- issue
|-- issue.net
    freeform
|-- jwhois.conf
    custom (libconfuse ?)
|-- kdump.conf
    ???
|-- koji.conf
    inistyle
|-- krb5.conf
    inistyle wit { } subsections
|-- ld.so.conf
    ???
|-- ldap.conf
    records: line
    format: kw ' '+ value
    comments: #.*$
|-- libaudit.conf
    records: line
    format: kw ' '+ '=' ' '+ value
    comments: #.*$
|-- libuser.conf
    inistyle
|-- libvirt
    XML
|-- localtime
    opaque
|-- login.defs
    records: line
    format: kw ' '+ value
    comments: #.*$
|-- logrotate.conf
|-- logrotate.d
    custom
|-- logwatch
    ???
|-- mail.rc
    custom
|-- mailcap
    records: line
    format: kw ' '+ '=' ' '+ value
    comments: #.*$
|-- makedev.d
    ???
|-- man.config
    records: line,
    format: kw ' '+ \value, fixed kw + user extensions
    comments: #.*$
|-- mime.types
|-- minicom.users
|-- mke2fs.conf
    custom, like krb5.conf
|-- mock/*.cfg
    python script
|-- modprobe.conf
|-- modprobe.d/*
    custom
|-- multipath.conf
    custom, libconfuse ?
|-- netconfig
    line records
|-- nscd.conf
    custom
|-- nsswitch.conf
|-- ntp
    custom
|-- ntp.conf
    custom
|-- openldap
    ???
|-- opt
|-- pam.d
    custom
|-- pam_pkcs11
|   |-- pam_pkcs11.conf
|   `-- pkcs11_eventmgr.conf
    libconfuse ?
|-- passwd
    Posix
|-- postfix
    ???
|-- prelink.conf
    custom
|-- puppet
|   |-- puppet.conf
    Ini-style
|-- quotagrpadmins
    records: line
    format: alias ':' redir
    comments: #.*$
|-- quotatab
|-- racoon
|   `-- racoon.conf
    custom
|-- readahead.conf
    sysconfig
|-- readahead.d
    path lists
|-- resolv.conf
    custom
|-- rpm
    random rpm macros (kw ' ' value style)
|-- rwtab
|-- rwtab.d
|-- sasl2
|-- scsi_id.config
|-- securetty
    list of ttys
|-- security
    ???
|-- selinux
    ???
|-- sensors.conf
    custom
|-- sestatus.conf
    inistyle
|-- shadow
    POSIX
|-- shells
    list of shells
|-- smartd.conf
    custom
|-- ssh
    key/value pairs
|-- statetab
|-- statetab.d
    list of paths
|-- sudoers
    custom
|-- sysconfig
    sysconfig
|-- sysctl.conf
    sysconfig, with special meaning for keys
|-- syslog.conf
    key/value, space separated
|-- udev
    custom
|-- updatedb.conf
    sysconfig
|-- xinetd.d/*
    custom
|-- yum
|-- yum.conf
`-- yum.repos.d/*
    inistyle with includes