su root
nano /etc/sudoers

user_name ALL=(ALL)  ALL

Ls command not found  
Nano command not found  
Sudo command not found  
Apt command not found

$ flatpak install flathub com.calibre_ebook.calibre

root@debian:/# dpkg-reconfigure keyboard-configuration
bash: dpkg-reconfigure: command not found

root@debian:/home/lm# find /usr -type f -name debconf
/usr/bin/debconf
/usr/lib/tasksel/tests/debconf
/usr/share/bash-completion/completions/debconf
/usr/share/lintian/overrides/debconf

root@debian:/home/lm# apt-get install dpkg
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
dpkg is already the newest version (1.21.22

root@debian:/home/lm# dpkg-reconfigure keyboard-configuration
bash: dpkg-reconfigure: command not found
root@debian:/home/lm# apt-get install debconf
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
debconf is already the newest version (1.5.82).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

if [ "$(id -u)" -eq 0 ]; then
  PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
else
  PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"

Linux debian 6.1.0-10-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.38-2 (2023-07-27) x86_64 GNU/Linux

___________________________________________
 / I see you're trying to use the terminal … \
 | Command not found: 			             |
 |					                         |
 |  xxx   				                     |
 |					                         |
 \______ ____________________________________/
   	    v
       ╭─╮
       ⌾ ⌾
       │▕│
       ╰─╯

Command 'co' not found, but can be installed with:
sudo apt install rcs
Do you want to install it? (N/y)

Command 'co' not found, but can be installed with:
sudo apt install rcs

#!/bin/bash
#command for changing directory to that in the given line...
#or that of the file in the given line

PATHS=$1
LINE=$2
PATH="$(echo "${PATHS}" | sed -n ${LINE}p)"
PATH="$(/home/gohomology/Scripts/pc_macros/file_system/getdir "${PATH}")"
cd ${PATH}

return 1

gohomology@gohomology:~/Desktop$ find . -name "example_file"
./example_dir/example_file

gohomology@gohomology:~/Desktop$ . cdline "$(!!)" 1
. cdline "$(find . -name "example_file")" 1

gohomology@gohomology:~/Desktop/example_dir$ ls
Command 'ls' is available in the following places
 * /bin/ls
 * /usr/bin/ls
The command could not be located because '/usr/bin:/bin' is not included in the PATH environment variable.
ls: command not found

gohomology@gohomology:~/Desktop/example_dir$ find . -name "example_file"
Command 'find' is available in the following places
 * /bin/find
 * /usr/bin/find
The command could not be located because '/bin:/usr/bin' is not included in the PATH environment variable.
find: command not found

-shellsession
dasaint@X1:~$ which load-ssh-keys
/usr/local/bin/custom/load-ssh-keys

dasaint@X1:~$ which rescanscsi
/usr/local/bin/custom/rescanscsi

dasaint@X1:~$ whereis rescanscsi
rescanscsi: /usr/local/bin/custom/rescanscsi

dasaint@X1:~$ whereis load-ssh-keys
load-ssh-keys: /usr/local/bin/custom/load-ssh-keys

-shellsession
dasaint@X1:~$ echo $PATH
/home/dasaint/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/local/bin/custom:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

-shellsession
dasaint@X1:~$ sudo rescanscsi
sudo: rescanscsi: command not found

-bash
#! /usr/bin/bash
#
# /usr/local/bin/custom/rescanscsi
#
# ReScan all SCSI/SATA Hosts
#
for SHOST in /sys/class/scsi_host/host*; do
    echo -n "Scanning ${SHOST##*/}..."
    echo "- - -" > ${SHOST}/scan
    echo Done
done

-bash
#! /usr/bin/bash
#
# Script:		load-ssh-keys.sh
# path:			/usr/local/bin/scripts
# Purpose:		add SSH private keys into ssh-agent
# Dependencies:	'/usr/bin/expect'
#				'/usr/bin/ssh-add'
# 
# '/usr/bin' must be included in the system path
#
# SYNOPSIS
# --------
# Reads the passphrase from '~/keypsph' and stores it in the variable, 'PSPH', then
# calls '/usr/bin/expect' to spawn ssh-add to add the SSH private keys into 
# ssh-agent and provide (send) the passphrase for the keys, followed by a .
#
# '/usr/bin/expect'  can be installed with:
#	sudo apt install expect
#
# Guide:	https://stackoverflow.com/questions/13033799/how-to-make-ssh-add-read-passphrase-from-a-file 
#
# Initialize a variable to store an exit code of '0'
EXITCODE=0
#
# Check whether the passphrase file, 'keypsph' exists in the user's home directory. 
# If not terminate the script with an appropriate message and error code.
if [ ! -f ~/.ssh/keypsph ]; then
    echo -e "ERROR: Passphrase file not found in $HOME/.ssh\nExiting..."
    exit 1
fi
# Read the passphrase from file, 'keypsph'
PSPH=$(cat ~/.ssh/keypsph)
#
# Call '/usr/bin/expect' to spawn ssh-add to add the SSH private keys to X2 into 
# ssh-agent and provide (send) the passphrase for the keys, followed by a .
expect .
expect .
expect .
expect << EOF
spawn ssh-add "$HOME/.ssh/x1-x8_key"
expect "Enter passphrase for /home/dasaint/.ssh/x1-x8_key:"
send "$PSPH\r"
expect eof
EOF
# Error Handling...
if [[ $EXITCODE != 0 ]]; then
  echo -e "Error adding x1-x2_key to SSH Agent\nExiting..."
  EXITCODE=$?
  exit $EXIITCODE
fi
#
# Exit the script with the appropriate exit code
exit $EXITCODE

command_not_found_handle(){
  ....

  # replace the previous wrong command with the correct one in bash history
  history -d -1
  history -s "$command $@"
}

command_not_found_handle wrong_command

$ foo
Could not find foo in PATH
$ which foo
/usr/local/corp/bin/foo
$ readlink -f which foo
/path/to/opt/foo/foo
$ /usr/local/corp/bin/foo
starting foo, output for foo, blah blah blah

root@kali:~# apt-get install theharvester
Reading package lists... Done
Building dependency tree       
Reading state information... Done
theharvester is already the newest version (3.1-0kali2).
theharvester set to manually installed.
The following packages were automatically installed and are no longer required:
  libayatana-ido3-0.4-0 libbfio1
Use 'apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 44 not upgraded.

root@kali:/usr/share# theharvester
bash: theharvester: command not found