Tools and Programs

tmux - terminal multiplexer.
rsync - a fast, versatile, remote (and local) file-copying tool.
lsof - show list open files.
dstat - versatile tool for generating system resource statistics.
xrdp - a RDP server.
PWGEN - generate pronounceable passwords.
MAKEPASSWD - generate and/or encrypt passwords.
aspell - interactive spell checker
hunspell - spell checker, stemmer and morphological analyzer.
screenfetch - fetches system/theme information in. terminal for Linux desktop screenshots.
strings - print the sequences of printable characters in files.
sshpass - noninteractive ssh password provider.
neofetch - displays information about your operating system, software and hardware in an aesthetic and visually pleasing way.
xsel/xclip - command line interface to the X11 clipboard.
jq - command-line JSON processor.
rkhunter - RootKit Hunter.
chkrootkit - RootKit Hunter.
qrencode - encode input data in a QR Code and save as a PNG image.
taskset - set or retrieve a process’s CPU affinity.
tr - translate or delete characters.
exec - execute command in current process.
eval - evaluate the specified commands.
tee - read from standard input and write to standard output and files.
script - record the terminal session.
expect - programmed dialogue with interactive programs.
xdotool - X11 automation tool.
wait - wait for jobs to complete.
tty-share - share terminal.
envsubst - substitutes environment variables in shell format strings.
fwupd - firmware update tool.
mktemp - create a temporary file or directory.
flock - manage locks from shell scripts.
enable - enable and disable shell builtins.
lastb - show last logged users.
ttyd - share terminal in web.
findmnt - find a filesystems.
setsid - run a program in a new session.
sleuthkit - forensics tools for investigate volume and file system.
comm - compare two sorted files line by line.
auditctl - a utility to assist controlling the kernel’s audit system.
inotifywait - monitor filesystem change events.
getcap - display the capabilities of a file.
notify-send - send desktop notifications.

CPU

chcpu - configure CPUs.
nproc - print the number of processing units available.

RAM

vmstat - report virtual memory statistics.
zram - linux kernel feature and userspace tools for creating compressible RAM-based block devices.
valgrind - instrumentation framework for building dynamic analysis tools.

Monitoring

iostat(sysstat) - report (CPU) statistics and I/O statistics for devices, partitions and NFS.
htop - interactive process viewer.
atop - AT Computing’s System & Process Monitor.
tcptrack - monitor TCP connections on the network.
trafshow - full screen show network traffic.
ifstat - report InterFace statistics.
iftop - display bandwidth usage on an interface by host.
ioping - simple disk I/O latency monitoring tool.
iptraf - interactive Colorful IP LAN Monitor.
nload - displays the current network usage.
nethogs - net top tool grouping bandwidth per process.
bmon - portable bandwidth monitor and rate estimator.
bwm-ng - a live bandwidth monitor for network and disk io.
fswatch - file change monitoring tool.
ttop - system monitoring tool.

Processes

pidof - find the process ID of a running program.
fuser - find processes using files or sockets.

Environment

env - run a program in a modified environment.
setenv - change or add an environment variable.
export - set the export attribute for variables.
set - display and change shell variables.

Recovery

testdisk - recovery software.
photorec - recovery software.

Network

iPerf - perform network throughput tests.
wget - the non-interactive network downloader.
curl - transfer data from or to a server.
tcpdump - dump traffic on a network.
tshark - dump and analyze network traffic.
mtr - a network diagnostic tool.

Disk

fio - flexible I/O tester.
cfdisk - display and manipulate a disk partition table.
nvme-cli - storage command line interface utility.

SIP

sipp - SIP testing tool and traffic generator.
sngrep - SIP Messages flow viewer.

SHELL

fish - friendly interactive shell.
fzf - general-purpose command-line fuzzy finder.
whiptail - display dialog boxes from shell scripts.

Android

adb - Android Debug Bridge.
fastboot - Android Fastboot.
scrcpy - display and control your Android device.
localdesktop - run Linux GUI apps on Android.

Utilities

simple-http-server - serve files via HTTP (python -m SimpleHTTPServer or python3 -m http.server).
uuidgen - create a new UUID value.
nginx - HTTP and reverse proxy server.
ldconfig - configure dynamic linker run-time bindings.
man - display system reference manual pages.
tree - display directory tree.

Chromium

chromium - open-source web browser.

# Proxy
chromium --proxy-server="socks://host:9050"

# Discards page
browser://discards
chrome://discards

# Task manager
Shift + ESC

# Chrome Flags
browser://flags/

# GPU information
browser://gpu/

Ffmpeg

ffmpeg - multimedia framework.

# Video from RTSP
ffmpeg -y -re -acodec pcm_s16le -rtsp_transport tcp -i rtsp:// -vcodec copy -af asetrate=22050 -acodec aac -b:a 96k -t 15 tmp/test.mp4

# Screenshot from RTSP
ffmpeg -rtsp_transport tcp -i rtsp:// -f image2 -vf fps=fps=1 -t 0.001 -ss 00:00:3 tmp/image.png

# Use find
FFMPEG_COMMAND="ffmpeg -hide_banner -loglevel error -y"
find . -type f -name "*.mp4" -print0 | while read -r -d '' file_name; do
    echo $file_name
    $FFMPEG_COMMAND -nostdin -i "$file_name" <params> - | $FFMPEG_COMMAND -i - -i "$file_name" <params> "${file_name/.mp4/}-dpni_fixed.mp4"
done

Youtube-dl / yt-dlp

youtube-dl / yt-dlp - download videos from YouTube and other sites.

# Best video
youtube-dl -f bestvideo+bestaudio 'url'

# Best audio
youtube-dl -f bestaudio 'url'

# List of formats
youtube-dl -F 'url'

Sox

sox - Sound eXchange, audio processing tool.

# Convert to VoIP format
sox -V vm-intro.wav -r 8000 -c 1 -t ul vm-intro.ulaw
sox -V vm-intro.wav -r 8000 -c 1 -t al vm-intro.alaw
sox -V vm-intro.wav -r 8000 -c 1 -t gsm vm-intro.gsm

Benchmark

fio - flexible I/O tester.

# Read
fio --name=randread --ioengine=libaio --iodepth=16 --rw=randread --bs=4k --direct=0 --size=512M --numjobs=4 --runtime=240 --group_reporting

# Write
fio --name=randwrite --ioengine=libaio --iodepth=1 --rw=randwrite --bs=4k --direct=0 --size=512M --numjobs=4 --runtime=240 --group_reporting

# Read & Write
fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=random_read_write.fio --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75

Curl

curl - transfer data from or to a server.

# REST API get
curl --include --location --request GET 'https://site_name/?fields=parameter_name' --header 'Authorization: OAuth id'

# Formatting JSON answer
curl --location --request GET 'https://site_name/?fields=parameter_name' --header 'Authorization: OAuth id' | python -m json.tool

# Download file
curl --location --remote-name https://<url to file>

QEMU

qemu - generic and open source machine emulator and virtualizer.

# LiveUSB
qemu-system-x86_64 -hda /dev/sdX

Kubectl

kubectl - Kubernetes command-line tool.

# Network utils
kubectl run -it --rm --image amouat/network-utils test bash

Scl

scl - Software Collections tool.

# Activate python environment
scl enable rh-python<version_number> bash

Man

man - display system reference manual pages.

# Description of the filesystem hierarchy
man hier

# ASCII table
man ascii

Certbot

certbot - automatic certificate management from Let’s Encrypt.

# Create certificate
certbot certonly --config ./certbot.ini --email <e-mail address> --work-dir </var/lib/letsencrypt> --config-dir <where save data> --domain <domain_name>

# Renew certificate
certbot renew --work-dir </var/lib/letsencrypt> --config-dir <where save data>

certbot.ini

authenticator = standalone
noninteractive = true
agree-tos = true
rsa-key-size = 2048