Section 1 of the manual describes user commands and tools, for example, file manipulation tools, shells, compilers, web browsers, file and image viewers and editors, and so on.

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aarch64-linux-gnu-gnatxref-9
gnat, gnatbind, gnatbl, gnatchop, gnatfind, gnathtml, gnatkr, gnatlink, gnatls, gnatmake, gnatprep, gnatpsta, gnatpsys, gnatxref - GNAT toolbox
aarch64-linux-gnu-gnatxref
gnat, gnatbind, gnatbl, gnatchop, gnatfind, gnathtml, gnatkr, gnatlink, gnatls, gnatmake, gnatprep, gnatpsta, gnatpsys, gnatxref - GNAT toolbox
aarch64-linux-gnu-gp-archive
gp-archive - archive gprofng experiment data
aarch64-linux-gnu-gp-collect-app
gp-collect-app - collect performance data for the target application
aarch64-linux-gnu-gp-display-html
gp-display-html - generate an HTML based directory structure to browse the profiles
aarch64-linux-gnu-gp-display-src
gp-display-src - display the source code, optionally interleaved with the disassembly of the target object
aarch64-linux-gnu-gp-display-text
gp-display-text - display the performance data in plain text format
aarch64-linux-gnu-gprof
gprof - display call graph profile data
aarch64-linux-gnu-gprofng
gprofng - the driver for the gprofng tool suite
aarch64-linux-gnu-ld
ld - The GNU linker
aarch64-linux-gnu-ld.bfd
ld - The GNU linker
aarch64-linux-gnu-ld.gold
gold - The GNU ELF linker
aarch64-linux-gnu-nm
nm - list symbols from object files
aarch64-linux-gnu-objcopy
objcopy - copy and translate object files
aarch64-linux-gnu-objdump
objdump - display information from object files
aarch64-linux-gnu-ranlib
ranlib - generate an index to an archive
aarch64-linux-gnu-readelf
readelf - display information about ELF files
aarch64-linux-gnu-size
size - list section sizes and total size of binary files
aarch64-linux-gnu-strings
strings - print the sequences of printable characters in files
aarch64-linux-gnu-strip
strip - discard symbols and other data from object files
aasavefont
aafire, aainfo, aasavefont, aatest - aalib example programs
aasvg
Convert ASCII art diagrams to SVG
aatest
aafire, aainfo, aasavefont, aatest - aalib example programs
aaxine
an ASCII art video player  
ab
Apache HTTP server benchmarking tool  
abacas
Algorithm Based Automatic Contiguation of Assembled Sequences
abba-baba
abba-baba
abc2abc
a simple abc checker/re-formatter/transposer
abc2ly
manual page for abc2ly (LilyPond) 2.24.1
abc2midi
converts abc file to MIDI file(s)
abcde
Grab an entire CD and compress it to Ogg/Vorbis, MP3, FLAC, Ogg/Speex, AAC, WavPack, Monkey's Audio (ape), MPP/MP+(Musepack), True Audio (tta), MP2 format and/or AIFF (Audio Interchange File Format)
abcm2ps
translate ABC music notation to PostScript or SVG
abcmatch
Search for specific sequences of notes in an abc file composed of many tunes
abi-compliance-checker
tool to compare ABI compatibility of shared C/C++ library versions
abi-dumper
a tool to dump ABI of an ELF object containing DWARF debug info
abi-monitor
monitor new versions of a software library and try to build them
abi-tracker
visualize ABI changes timeline of a C/C++ software library
abicheck
check application binaries for calls to private or evolving symbols in libraries and for static linking of some system libraries
abicompat
check ABI compatibility   abicompat checks that an application that links against a given shared library is still ABI compatible with a subsequent version of that library. If the new version of the library introduces an ABI incompatibility, then abicompat hints the user at what exactly that incompatibility is
abidiff
types, abidiff uses by default, debug information in DWARF format, if present, otherwise it compares interfaces using debug information in CTF format, if present, finally, if neither is found, it uses only ELF symbols to report which of them were added or removed.   This tool uses the libabigail library to analyze the binary as well as its associated debug information. Here is its general mode of operation.   When instructed to do so, a binary and its associated debug information is read and analyzed. To that effect, libabigail analyzes by default the descriptions of the types reachable by the interfaces (functions and variables) that are visible outside of their translation unit. Once that analysis is done, an Application Binary Interface Corpus is constructed by only considering the subset of types reachable from interfaces associated to ELF symbols that are defined and exported by the binary. It’s that final ABI corpus which libabigail considers as representing the ABI of the analyzed binary.   Libabigail then has capabilities to generate textual representations of ABI Corpora, compare them, analyze their changes and report about them
abidw
abilint
validate an abigail ABI representation   abilint parses the native XML representation of an ABI as emitted by abidw . Once it has parsed the XML representation of the ABI, abilint builds and in-memory model from it. It then tries to save it back to an XML form, to standard output. If that read-write operation succeeds chances are the input XML ABI representation is meaningful.   Note that the main intent of this tool to help debugging issues in the underlying Libabigail library.   Note also that abilint can also read an ELF input file, build the in-memory model for its ABI, and serialize that model back into XML to standard output. In that case, the ELF input file must be accompanied with its debug information in the DWARF format
abinit
Ab initio atomic-scale simulation software
abipkgdiff
abisip-find
utility to find ip.access compatible BTS
abiview
Display the trace in an ABI sequencer file
abiword
flexible cross-platform word processor
abook
text-based address book program
abootimg
manipulate Android Boot Images
abpoa
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.avx
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.avx2
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.generic
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.sse3
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.sse4.1
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abpoa.ssse3
abpoa, abpoa.avx2, abpoa.avx, abpoa.sse4.1, abpoa.ssse3, abpoa.sse3, abpoa.generic - adaptive banded Partial Order Alignment
abr2gbr
Converts PhotoShop and Paint Shop Pro brushes to GIMP
abuild
build coreboot images for all available targets
abx
audio ABX testing software
abyss-fixmate
Fill the paired-end fields of SAM alignments
abyss-pe
assemble reads into contigs
abyss-tofastq
convert various file formats to FASTQ format   abyss-tofasta - convert various file formats to FASTA format
ac++
aspectc++ — aspect weaver for C++
ac
print statistics about users' connect time
acat
atool - A script for managing file archives of various types
acccheck
Password dictionary attack tool that targets windows authentication via the SMB protocol
accel-config-config-device
configure the individual attributes of the device
accel-config-config-engine
configure individual attributes of an engine
accel-config-config-group
configure individual attributes of a group
accel-config-config-wq
configure individual attributes of a work queue
accel-config-disable-device
disables an accfg device
accel-config-disable-wq
disables an accelerator device work queue
accel-config-enable-device
enable an accfg device
accel-config-enable-wq
enables an accelerator device work queue
accel-config-list
display the platform accfg device(s) topology and attributes in json format
accel-config-load-config
load pre-defined the configuration in json format
accel-config-save-config
save the configuration in json format into a file
accel-config
configure and control DSA(data streaminng accelerator) subsystem devices
accerciser
ACCERCISER - an interactive accessibility explorer
accn-at-a-time
parse an input file into biological identifiers
accs
vadm - manipulate and administer version object base
acdc
Test an application ACD file
acdcheck
acdcheck
acdlog
Test application ACD file processing and trace data structures
acdpretty
Correctly reformat an application ACD file
acdrelations
Add relations: attribute to ACD files
acdtable
Generate an HTML table of parameters from an application ACD file
acdtrace
Trace processing of an application ACD file (for testing)
acdvalid
Validate an application ACD file
ace
HTML template engine for Go  
ace2sam
ace to sam converter
ace_gperf
generate a perfect hash function from a key set
ace_netsvcs
ACE network services driver
acheck
Check common localization mistakes
achilles
OpenGL simulation of artificial life and evolution
ack
grep-like text finder
ackinfo.cgi
Xymon CGI script to acknowledge alerts
acknowledge.cgi
Xymon CGI script to acknowledge alerts
acl2
A Computational Logic
aclients
Test program for side-by-side TNC performance comparison.