5

File Formats

Section 5 of the manual describes various file formats and protocols, and the corresponding C structures, if any.

Top 5 commands

Command Description Lookups
1 crontab tables for driving cron (ISC Cron V4.1)
2 resolv.conf resolver configuration file
3 sshd_config OpenSSH SSH daemon configuration file
4 wpa_supplicant.conf configuration file for wpa_supplicant
5 syslog.conf syslogd configuration file

All commands317

  • Command
  • Description
access.conf
the login access control table file
acl
Access Control Lists
adjtime_config
information about hardware clock setting and drift factor
aliases
aliases file for sendmail
anacrontab
configuration file for Anacron
apt_preferences
Preference control file for APT
auditd.conf
audit daemon configuration file
auditd-plugins
realtime event receivers
ausearch-expression
audit search expression format
autofs
Format of the automounter maps
autofs.conf
autofs configuration
autofs_ldap_auth.conf
autofs LDAP authentication configuration
auto.master
Master Map for automounter consulted by autofs
binfmt.d
Configure additional binary formats for executables at boot
bootchart.conf
Boot performance analysis graphing tool configuration files
bootchart.conf.d
Boot performance analysis graphing tool configuration files
charmap
character set description file
classes.conf
class configuration file for cups
client.conf
client configuration file for cups (deprecated on macos)
config
OpenSSL CONF library configuration files
core
core dump file
coredump.conf
Core dump storage configuration files
coredump.conf.d
Core dump storage configuration files
crontab
tables for driving cron
cupsd.conf
server configuration file for cups
cupsd-logs
cupsd log files (access_log, error_log, and page_log)
cups-files.conf
file and directory configuration file for cups
cups-snmp.conf
snmp configuration file for cups (deprecated)
customizable_types
The SELinux customizable types configuration file
deb
Debian binary package format
deb822
Debian RFC822 control data format
deb-buildinfo
Debian build information file format
deb-changelog
dpkg source packages' changelog file format
deb-changes
Debian changes file format
deb-conffiles
package conffiles
deb-control
Debian binary packages' master control file format
deb-extra-override
Debian archive extra override file
deb-old
old style Debian binary package format
deb-origin
Vendor-specific information files
deb-override
Debian archive override file
deb-postinst
package post-installation maintainer script
deb-postrm
package post-removal maintainer script
deb-preinst
package pre-installation maintainer script
deb-prerm
package pre-removal maintainer script
deb-shlibs
Debian shared library information file
deb-split
Debian multi-part binary package format
deb-src-control
Debian source packages' master control file format
deb-src-files
Debian distribute files format
deb-src-rules
Debian source package rules file
deb-substvars
Debian source substitution variables
deb-symbols
Debian's extended shared library information file
deb-triggers
package triggers
default_contexts
The SELinux default contexts configuration file
default_type
The SELinux default type configuration file
depmod.d
Configuration directory for depmod
dir_colors
configuration file for dircolors(1)
dnssec-trust-anchors.d
DNSSEC trust anchor configuration files
dpkg.cfg
dpkg configuration file
dracut.conf
configuration file(s) for dracut
dsc
Debian source packages' control file format
dselect.cfg
dselect configuration file
e2fsck.conf
Configuration file for e2fsck
elf
format of Executable and Linking Format (ELF) files
environment
the environment variables config files
environment.d
Definition of user session environment
ethers
Ethernet address to IP number database
exports
NFS server export table
ext2
the fourth extended file system
ext3
the fourth extended file system
ext4
the fourth extended file system
failsafe_context
The SELinux fail safe context configuration file
file_contexts
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.homedirs
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.local
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.subs
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.subs_dist
userspace SELinux labeling interface and configuration file format for the file contexts backend
filesystems
Linux filesystem types: ext, ext2, ext3, ext4, hpfs, iso9660, JFS, minix, msdos, ncpfs nfs, ntfs, proc, Reiserfs, smb, sysv, umsdos, vfat, XFS, xiafs,
firejail-login
Login file syntax for Firejail
firejail-profile
Security profile file syntax for Firejail
firejail-users
Firejail user access database
forward
email forwarding information file
fs
Linux filesystem types: ext, ext2, ext3, ext4, hpfs, iso9660, JFS, minix, msdos, ncpfs nfs, ntfs, proc, Reiserfs, smb, sysv, umsdos, vfat, XFS, xiafs,
fstab
static information about the filesystems
ftpusers
list of users that may not log in via the FTP daemon
gai.conf
getaddrinfo(3) configuration file
gdbinit
GDB initialization scripts
gitattributes
Defining attributes per path
githooks
Hooks used by Git
gitignore
Specifies intentionally untracked files to ignore
gitmodules
Defining submodule properties
gitrepository-layout
Git Repository Layout
gitweb.conf
Gitweb (Git web interface) configuration file
groff_font
format of groff device and font description files
groff_out
groff intermediate output format
groff_tmac
macro files in the roff typesetting system
group
user group file
group.conf
configuration file for the pam_group module
gshadow
shadowed group file
hgignore
syntax for Mercurial ignore files
hgrc
configuration files for Mercurial
host.conf
resolver configuration file
hosts
static table lookup for hostnames
hosts.equiv
list of hosts and users that are granted "trusted" r command access to your system
ipptoolfile
ipptool file format
issue
prelogin message and identification file
journald.conf
Journal service configuration files
journald.conf.d
Journal service configuration files
keymaps
keyboard table descriptions for loadkeys and dumpkeys
ldap.conf
LDAP configuration file/environment variables
ldif
LDAP Data Interchange Format
libaudit.conf
libaudit configuration file
limits.conf
configuration file for the pam_limits module
lj4_font
groff fonts for use with devlj4
locale.conf
Configuration file for locale settings
LOGARCHIVE
performance metrics archive format
logind.conf
Login manager configuration files
logind.conf.d
Login manager configuration files
login.defs
shadow password suite configuration
logrotate.conf
rotates, compresses, and mails system logs
ltrace.conf
Configuration file for ltrace(1).
lvm.conf
Configuration file for LVM2
lxc.conf
Configuration files for LXC.
lxc.container.conf
LXC container configuration file
lxc.system.conf
LXC system configuration file
lxc-usernet
unprivileged user network administration file.
machine-id
Local machine ID configuration file
machine-info
Local machine information file
mailto.conf
configuration file for cups email notifier
mdadm.conf
configuration for management of Software RAID with mdadm
media
userspace SELinux labeling interface and configuration file format for the media contexts backend
mime.convs
mime type conversion file for cups (deprecated)
mime.types
mime type description file for cups
mke2fs.conf
Configuration file for mke2fs
mmv
Memory Mapped Values for Performance Co-Pilot
modprobe.d
Configuration directory for modprobe
modules.dep
Module dependency information
modules.dep.bin
Module dependency information
modules-load.d
Configure kernel modules to load at boot
moduli
Diffie-Hellman moduli
motd
message of the day
namespace.conf
the namespace configuration file
networkd.conf
Global Network configuration files
networkd.conf.d
Global Network configuration files
networks
network name information
nfs
fstab format and options for the nfs file systems
nfs4_acl
NFSv4 Access Control Lists
nfs.conf
general configuration for NFS daemons and tools
nfsmount.conf
Configuration file for NFS mounts
nologin
prevent unprivileged users from logging into the system
nscd.conf
name service cache daemon configuration file
nss
Name Service Switch configuration file
nsswitch.conf
Name Service Switch configuration file
numa_maps
overview of Non-Uniform Memory Architecture
os-release
Operating system identification
ovn-nb
OVN_Northbound database schema
ovn-sb
OVN_Southbound database schema
ovs-vswitchd.conf.db
Open_vSwitch database schema
pam.conf
PAM configuration files
pam.d
PAM configuration files
pam_env.conf
the environment variables config files
pcp-atoprc
pcp-atop/pcp-atopsar related resource file
pcp.conf
the Performance Co-Pilot configuration and environment file
pcp.env
script to set Performance Co-Pilot run-time environment variables
perfevent.conf
the Performance Co-Pilot perfevent PMDA configuration file
pmns
the performance metrics name space
pmrep.conf
pmrep configuration file
ppdcfile
cups ppd compiler source file format (deprecated)
printers.conf
printer configuration file for cups
proc
process information pseudo-filesystem
procfs
process information pseudo-filesystem
projects
persistent project root definition
projid
the project name mapping file
protocols
protocols definition file
quotagrpadmins
users responsible for group disk usage
quotatab
Descriptions of devices with disk quotas
removable_context
The SELinux removable devices context configuration file
repertoiremap
map symbolic character names to Unicode code points
request-key.conf
Instantiation handler configuration file
resolv.conf
resolver configuration file
resolved.conf
Network Name Resolution configuration files
resolved.conf.d
Network Name Resolution configuration files
rsyncd.conf
configuration file for rsync in daemon mode
rsyslog.conf
rsyslogd(8) configuration file
sandbox
user config file for the SELinux sandbox
scr_dump
format of curses screen-dumps.
secolor.conf
The SELinux color configuration file
securetty
file which lists terminals from which root can log in
securetty_types
The SELinux secure tty type configuration file
selabel_db
userspace SELinux labeling interface and configuration file format for the RDBMS objects context backend
selabel_file
userspace SELinux labeling interface and configuration file format for the file contexts backend
selabel_media
userspace SELinux labeling interface and configuration file format for the media contexts backend
selabel_x
userspace SELinux labeling interface and configuration file format for the X Window System contexts backend. This backend is also used to determine the default context for labeling remotely connected X clients
selinux_config
The SELinux sub-system configuration file.
semanage.conf
global configuration file for the SELinux Management library
sepermit.conf
configuration file for the pam_sepermit module
sepgsql_contexts
userspace SELinux labeling interface and configuration file format for the RDBMS objects context backend
services
Internet network services list
service_seusers
The SELinux GNU/Linux user and service to SELinux user mapping configuration files
sestatus.conf
The sestatus(8) configuration file.
seusers
The SELinux GNU/Linux user to SELinux user mapping configuration file
shells
pathnames of valid login shells
slabinfo
kernel slab allocator statistics
slapd.access
access configuration for slapd, the stand-alone LDAP daemon
slapd.backends
backends for slapd, the stand-alone LDAP daemon
slapd.conf
configuration file for slapd, the stand-alone LDAP daemon
slapd-config
configuration backend to slapd
slapd-dnssrv
DNS SRV referral backend to slapd
slapd-ldap
LDAP backend to slapd
slapd-ldif
LDIF backend to slapd
slapd-mdb
Memory-Mapped DB backend to slapd
slapd-meta
metadirectory backend to slapd
slapd-monitor
Monitor backend to slapd
slapd-ndb
MySQL NDB backend to slapd
slapd-null
Null backend to slapd
slapd.overlays
overlays for slapd, the stand-alone LDAP daemon
slapd-passwd
/etc/passwd backend to slapd
slapd-perl
Perl backend to slapd
slapd.plugin
plugin configuration for slapd, the stand-alone LDAP daemon
slapd-relay
relay backend to slapd
slapd-shell
Shell backend to slapd
slapd-sock
Socket backend/overlay to slapd
slapd-sql
SQL backend to slapd
slapo-accesslog
Access Logging overlay to slapd
slapo-auditlog
Audit Logging overlay to slapd
slapo-chain
chain overlay to slapd
slapo-collect
Collective attributes overlay to slapd
slapo-constraint
Attribute Constraint Overlay to slapd
slapo-dds
Dynamic Directory Services overlay to slapd
slapo-dyngroup
Dynamic Group overlay to slapd
slapo-dynlist
Dynamic List overlay to slapd
slapo-memberof
Reverse Group Membership overlay to slapd
slapo-pbind
proxy bind overlay to slapd
slapo-pcache
proxy cache overlay to slapd
slapo-ppolicy
Password Policy overlay to slapd
slapo-refint
Referential Integrity overlay to slapd
slapo-retcode
return code overlay to slapd
slapo-rwm
rewrite/remap overlay to slapd
slapo-sock
Socket backend/overlay to slapd
slapo-sssvlv
Server Side Sorting and Virtual List View overlay to slapd
slapo-syncprov
Sync Provider overlay to slapd
slapo-translucent
Translucent Proxy overlay to slapd
slapo-unique
Attribute Uniqueness overlay to slapd
slapo-valsort
Value Sorting overlay to slapd
sleep.conf.d
Suspend and hibernation configuration file
smtpd.conf
Simple Mail Transfer Protocol daemon configuration file
snmp.conf
configuration files for the Net-SNMP applications
sources.list
List of configured APT data sources
srp_daemon_port@.service
srp_daemon_port@ systemd service that controls a single port
srp_daemon.service
srp_daemon systemd service that controls all ports
ssh_config
OpenSSH SSH client configuration files
sshd_config
OpenSSH SSH daemon configuration file
subgid
the subordinate gid file
subscriptions.conf
subscription configuration file for cups
subuid
the subordinate uid file
sysctl.conf
sysctl preload/configuration file
sysctl.d
Configure kernel parameters at boot
syslog.conf
configuration file for
sysstat
sysstat configuration file.
system.conf.d
System and session service manager configuration files
systemd.automount
Automount unit configuration
systemd.device
Device unit configuration
systemd.exec
Execution environment configuration
systemd.kill
Process killing procedure configuration
systemd.link
Network device configuration
systemd.mount
Mount unit configuration
systemd.negative
DNSSEC trust anchor configuration files
systemd.netdev
Virtual Network Device configuration
systemd.network
Network configuration
systemd.nspawn
Container settings
systemd.path
Path unit configuration
systemd.positive
DNSSEC trust anchor configuration files
systemd.preset
Service enablement presets
systemd.resource-control
Resource control unit settings
systemd.scope
Scope unit configuration
systemd.service
Service unit configuration
systemd-sleep.conf
Suspend and hibernation configuration file
systemd.slice
Slice unit configuration
systemd.socket
Socket unit configuration
systemd.swap
Swap unit configuration
systemd-system.conf
System and session service manager configuration files
systemd.target
Target unit configuration
systemd.timer
Timer unit configuration
systemd.unit
Unit configuration
systemd-user.conf
System and session service manager configuration files
sysusers.d
Declarative allocation of system users and groups
table
format description for smtpd tables
term
format of compiled term file.
termcap
terminal capability database
terminal-colors.d
Configure output colorization for various utilities
terminfo
terminal capability data base
time.conf
configuration file for the pam_time module
timesyncd.conf
Network Time Synchronization configuration files
timesyncd.conf.d
Network Time Synchronization configuration files
tmpfiles.d
Configuration for creation, deletion and cleaning of volatile and temporary files
tmpfs
a virtual memory filesystem
trace-cmd.dat
trace-cmd file format
ttytype
terminal device to default terminal type mapping
tzfile
timezone information
udev.conf
Configuration for device event managing daemon
user_caps
user-defined terminfo capabilities
user.conf.d
System and session service manager configuration files
user_contexts
The SELinux user contexts configuration files
utmp
login records
utmpx
login records
vconsole.conf
Configuration file for the virtual console
virtual_domain_context
The SELinux virtual machine domain context configuration file
virtual_image_context
The SELinux virtual machine image context configuration file
vtep
hardware_vtep database schema
warnquota.conf
configuration for warnquota
wpa_supplicant.conf
configuration file for wpa_supplicant
wtmp
login records
x_contexts
userspace SELinux labeling interface and configuration file format for the X Window System contexts backend. This backend is also used to determine the default context for labeling remotely connected X clients
xfs
layout, mount options, and supported file attributes for the XFS filesystem
yum.conf
Configuration file for yum(8).
yum-updatesd.conf
Configuration file for yum-updatesd(8).
yum-versionlock.conf
redirecting to DNF versionlock Plugin
zos-remote.conf
the audisp-racf plugin configuration file