Linux CLI Tools

see also:

dd	data destroyer, copies files bit by bit
dmidecode	show BIOS devices
journalctl	show logs (only systemd)
ldd	information about shared libs
strace	Stack Trace
sysstat	System statistics collection daemon, contains sar, iostat, mpstat, pidstat, sadf. Has a telegraf input plugin

badblocks	scan device for bad blocks
blockdev	check some block device parameters
cgdisk	ncurses partition manager (gdisk frontend)
df	show free space
findmnt	show mounts
f3	Utilities to detect and repair counterfeit flash storage
iostat	I/O statistics
iotop	I/O process statistics
ncdu	ncurses disk usage
vmtouch	learning about and controlling the file system cache
ranger	CLI file manager with vi-like keybinds
sar	from package sysstat, collects and reports system activity information
jdupes	find duplicates and deduplicate them with Btrfs
wipe	delete and overwrite files and folders in a secure manner

imapsync	copy IMAP mails around
swaks	Swiss Army Knife for SMTP

git	Git code management
imagemagick	image processing
man	show manuals (manpages)
tar	pack files into "tape archives"
shellcheck	check shell scripts for errors
date	show date

exiftool	view (image) file information
pev	PE32 file analysis

System