Section 5 of the manual describes various file formats, as well as the corresponding C structures, if any. In addition, this section contains a number of pages that document various filesystems.

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.containerignore
.containerignore(.dockerignore) - files to ignore buildah or podman build context directory  
00-upstream-settings
dconf configuration file  
99user.ldif
/etc/dirsrv/schema/99user.ldif - LDIF file containing custom LDAP Schema for 389 Directory Server.  
BUILDINFO
Makepkg package build information file
BackupLog
Traces Backup Server operations
BosConfig
Defines server processes for the BOS Server to monitor
BosLog
Traces BOS Server operations
CONSTANTS
constants for LAM Fortran programming
CellAlias
Maps cell names to aliases in /afs
CellServDB
Lists the database server machines in AFS cells
Compose
X client mappings for multi-key input sequences
Containerfile
Containerfile(Dockerfile) - automate the steps of creating a container image  
DSA
Digital Signature Algorithm
Dockerfile
automate the steps of creating a Docker image  
FORCESALVAGE
Forces salvage of entire partition
FileLog
Traces File Server operations
GeoIP.conf
Configuration file for geoipupdate
KeyFile
Defines AFS server encryption keys
KeyFileExt
Defines extended AFS server encryption keys
LOGARCHIVE
Performance Co-Pilot archive log formats
META
[File that specifies metainformation of OCaml packages]
ModuleDtmfRepeater.conf
Configuration file for the SvxLink server DTMF Repeater module
ModuleEchoLink.conf
Configuration file for the SvxLink server EchoLink module
ModuleFrn.conf
Configuration file for the SvxLink server Free Radio Network (FRN) module
ModuleHelp.conf
Configuration file for the SvxLink server Help module
ModuleParrot.conf
Configuration file for the SvxLink server Parrot module
ModulePropagationMonitor.conf
Configuration file for the SvxLink server PropagationMonitor module
ModuleSelCallEnc.conf
Configuration file for the SvxLink server SelCallEnc module
ModuleSiteStatus.conf
Configuration file for the SvxLink server Site status module
ModuleTclVoiceMail.conf
Configuration file for the SvxLink server TclVoiceMail module
ModuleTrx.conf
Configuration file for the SvxLink transceiver control module
ModuleTxFan.conf
Configuration file for the SvxLink server Transmitter Fan module
NetInfo
Defines machine interfaces to register with AFS servers
NetRestrict
Defines interfaces not to register with AFS servers
NetworkManager.conf
NetworkManager configuration file
NoAuth
Disables authorization checking
PAPI_derived_event_files
Describes derived event definition file syntax
PKGBUILD
Arch Linux package build description file
PMNS
the performance metrics name space
PtLog
Traces Protection Server operations
SALVAGE.fs
Triggers salvaging of AFS server partitions
SHA
Secure Hash Algorithm
SPKI
Simple Public Key Infrastructure formats
SalvageLog
Traces Salvager operations
ThisCell
Defines the local cell name
Traits
Lists the traits used by the Motif Toolkit. "Traits"
UIL
The user interface language file format "user interface language" "UIL"
UserList
Defines privileged administrators
VLLog
Traces Volume Location Server operations
VolserLog
Traces Volume Server operations
WML
The widget meta-language file format for creating uil compilers "widget meta-language" "WML"
XCompose
Compose - X client mappings for multi-key input sequences
Xsession
initialize X session
Xsession.options
Xsession.options, Xsession.options.d - configuration options for Xsession (5)
Xsession.options.d
Xsession.options, Xsession.options.d - configuration options for Xsession (5)
Xwrapper.config
Xorg.wrap - Xorg X server binary wrapper
abookrc
$HOME/.abook/abookrc - configuration file for abook address book program
access
Postfix SMTP server access table
access.conf
the login access control table file
account-server.conf
configuration file for the OpenStack Swift account server  
acct
process accounting file
acct_gather.conf
Slurm configuration file for the acct_gather plugins  
acheck-rules
set.rules - Rules set for acheck
acheck
.acheck - Acheck configuration file
acl
Access Control Lists
active
List of newsgroups carried by the server
active.times
List of local creation times of newsgroups
adduser.conf
/etc/adduser.conf - configuration file for adduser (8) and addgroup (8)
adjtime_config
information about hardware clock setting and drift factor
adminaddr
nullmailer-queue - insert mail messages into the queue
aerc-accounts
account configuration file format for aerc (1)
aerc-binds
key bindings configuration file format for aerc (1)
aerc-config
configuration file format for aerc (1)
aerc-imap
IMAP configuration for aerc (1)
aerc-maildir
maildir configuration for aerc (1)
aerc-notmuch
notmuch configuration for aerc (1)
aerc-sendmail
sendmail configuration for aerc (1)
aerc-smtp
SMTP configuration for aerc (1)
aewan
File format documentation  
af_archive
- format of archive files in the Attribute Filesystem
afs
Introduction to AFS files
afs_cache
Format of data stored in an AFS client disk cache
afs_volume_header
Represents an AFS volume
afsmonitor
Provides instructions for the afsmonitor command
afszcm.cat
Error message catalog for debugging the Cache Manager
aide.conf
The configuration file for Advanced Intrusion Detection Environment
alerts.cfg
Configuration for for xymond_alert module  
aliases
Postfix local alias database format
aliases.sendmail
aliases - aliases file for sendmail
alifmt
Aligned sequences formats" 4
alpm-hooks
alpm hook file format
amanda-archive-format
Format of amanda archive streams
amanda-client.conf
Client configuration file for Amanda, the Advanced Maryland Automatic Network Disk Archiver
amanda-command-file
Keep status of outgoing dle commands
amanda-security.conf
Client configuration file for Amanda
amanda.conf
Main configuration file for Amanda, the Advanced Maryland Automatic Network Disk Archiver
american-english-huge
a list of English words
american-english-insane
a list of English words
american-english-large
a list of English words
american-english-small
a list of English words