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  This (the Directory node) gives a menu of major topics.
  Typing "q" exits, "H" lists all Info commands, "d" returns here,
  "h" gives a primer for first-timers,
  "mEmacs<Return>" visits the Emacs manual, etc.

  In Emacs, you can click mouse button 2 on a menu item or cross reference
  to select it.

Basics

Common options

Coreutils

Core GNU (file, text, shell) utilities.

Date input formats

File permissions

Access modes.

Finding files

Operating on files matching certain criteria.

Compression

Gzip

General (de)compression of files (lzw).

Editors

nano

Small and friendly text editor.

Emacs

Emacs FAQ

Frequently Asked Questions about Emacs.

Emacs misc features

Transient

Transient Commands.

General Commands

Screen

Full-screen window manager.

GNU organization

Maintaining Findutils

Maintaining GNU findutils

GNU Utilities

dirmngr-client

X.509 CRL and OCSP client.

dirmngr

X.509 CRL and OCSP server.

gpg-agent

The secret key daemon.

gpg2

OpenPGP encryption and signing tool.

gpgsm

S/MIME encryption and signing tool.

Individual utilities

arch

Print machine hardware name.

b2sum

Print or check BLAKE2 digests.

base32

Base32 encode/decode data.

base64

Base64 encode/decode data.

basename

Strip directory and suffix.

basenc

Encoding/decoding of data.

bibtex

Maintaining bibliographies.

cat

Concatenate and write files.

chcon

Change SELinux CTX of files.

chgrp

Change file groups.

chmod

Change access permissions.

chown

Change file owners and groups.

chroot

Specify the root directory.

cksum

Print POSIX CRC checksum.

cmp

Compare 2 files byte by byte.

comm

Compare sorted files by line.

cp

Copy files.

csplit

Split by context.

cut

Print selected parts of lines.

date

Print/set system date and time.

dd

Copy and convert a file.

df

Report file system usage.

diff

Compare 2 files line by line.

diff3

Compare 3 files line by line.

dircolors

Color setup for ls.

dirname

Strip last file name component.

dir

List directories briefly.

du

Report file usage.

dvicopy

Virtual font expansion

dvitomp

DVI to MPX (MetaPost pictures).

dvitype

DVI to human-readable text.

echo

Print a line of text.

env

Modify the environment.

expand

Convert tabs to spaces.

expr

Evaluate expressions.

factor

Print prime factors

false

Do nothing, unsuccessfully.

find

Finding and acting on files.

fmt

Reformat paragraph text.

fold

Wrap long input lines.

gftodvi

Generic font proofsheets.

gftopk

Generic to packed fonts.

gftype

GF to human-readable text.

groups

Print group names a user is in.

gunzip

Decompression.

gzexe

Compress executables.

head

Output the first part of files.

hostid

Print numeric host identifier.

hostname

Print or set system name.

id

Print user identity.

install

Copy files and set attributes.

install-tl

Installing TeX Live.

join

Join lines on a common field.

kill

Send a signal to processes.

link

Make hard links between files.

ln

Make links between files.

locate

Finding files in a database.

logname

Print current login name.

ls

List directory contents.

md5sum

Print or check MD5 digests.

mf

Creating typeface families.

mft

Prettyprinting Metafont source.

mkdir

Create directories.

mkfifo

Create FIFOs (named pipes).

mknod

Create special files.

mktemp

Create temporary files.

mltex

Multi-lingual TeX.

mpost

Generating PostScript.

mv

Rename files.

nice

Modify niceness.

nl

Number lines and write files.

nohup

Immunize to hangups.

nproc

Print the number of processors.

numfmt

Reformat numbers.

od

Dump files in octal, etc.

paste

Merge lines of files.

patch

Apply a patch to a file.

patgen

Creating hyphenation patterns.

pathchk

Check file name portability.

pktogf

Packed to generic fonts.

pktype

PK to human-readable text.

pltotf

Property list to TFM.

pooltype

Display WEB pool files.

printenv

Print environment variables.

printf

Format and print data.

pr

Paginate or columnate files.

ptx

Produce permuted indexes.

pwd

Print working directory.

readlink

Print referent of a symlink.

realpath

Print resolved file names.

rmdir

Remove empty directories.

rm

Remove files.

runcon

Run in specified SELinux CTX.

sdiff

Merge 2 files side-by-side.

seq

Print numeric sequences

sha1sum

Print or check SHA-1 digests.

sha2

Print or check SHA-2 digests.

shred

Remove files more securely.

shuf

Shuffling text files.

sleep

Delay for a specified time.

sort

Sort text files.

split

Split into pieces.

stat

Report file(system) status.

stdbuf

Modify stdio buffering.

stty

Print/change terminal settings.

sum

Print traditional checksum.

sync

Sync files to stable storage.

tac

Reverse files.

tail

Output the last part of files.

tangle

WEB to Pascal.

tee

Redirect to multiple files.

test

File/string tests.

tex

Typesetting.

tftopl

TFM -> property list.

timeout

Run with time limit.

tlmgr

Managing TeX Live.

touch

Change file timestamps.

true

Do nothing, successfully.

truncate

Shrink/extend size of a file.

tr

Translate characters.

tsort

Topological sort.

tty

Print terminal name.

uname

Print system information.

unexpand

Convert spaces to tabs.

uniq

Uniquify files.

unlink

Removal via unlink(2).

updatedb

Building the locate database.

uptime

Print uptime and load.

users

Print current user names.

vdir

List directories verbosely.

vftovp

Virtual font -> virtual pl.

vptovf

Virtual pl -> virtual font.

wc

Line, word, and byte counts.

weave

WEB to TeX.

whoami

Print effective user ID.

who

Print who is logged in.

xargs

Operating on many files.

yes

Print a string indefinitely.

zcat

Decompression to stdout.

zdiff

Compare compressed files.

zforce

Force .gz extension on files.

zgrep

Search compressed files.

zmore

Decompression output by pages.

Internationalization and character sets

recode

Conversion between character sets and surfaces.

Kernel

grub-dev

The GRand Unified Bootloader Dev

grub-install

Install GRUB on your drive

grub-mkconfig

Generate GRUB configuration

grub-mkpasswd-pbkdf2

grub-mkrelpath

grub-mkrescue

Make a GRUB rescue image

grub-mount

Mount a file system using GRUB

grub-probe

Probe device information

grub-script-check

GRUB

The GRand Unified Bootloader

Libraries

RLuserman

The GNU readline library User's Manual.

Math

bc

An arbitrary precision calculator language.

Network applications

Wget

Non-interactive network downloader.

TeX

DVI-to-PostScript

Translating TeX DVI files to PostScript.

Kpathsea

File lookup along search paths.

TLbuild

TeX Live configuration and development.

Web2c

TeX, Metafont, and companion programs.

afm2tfm

Making Type 1 fonts available to TeX.

dvips

DVI-to-PostScript translator.

kpsewhich

TeX file searching.

mktexfmt

Format (fmt/base/mem) generation.

mktexlsr

Update ls-R.

mktexmf

MF source generation.

mktexpk

PK bitmap generation.

mktextex

TeX source generation.

mktextfm

TeX font metric generation.

Texinfo documentation system

info stand-alone

Read Info documents without Emacs.

Text creation and manipulation

Diffutils

Comparing and merging files.

M4

A powerful macro processor.

grep

Print lines that match patterns.

sed

Stream EDitor.