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Env-format

🕵️ Operation Data Centre

[Confidential]

You are on a secret mission inside an underground data centre. You are alone, there is no internet access and there is no mobile phone signal.

You cannot interact with anyone.

You cannot not access the internet - although you can read the mission below.

You may access man pages via the command line. This is your only resource.

Good luck agent, we're counting on your knowledge.

Instructions

Create a script env-format.sh, which will print the environment variables that have the following formats:

  • Print the PWD value.
  • All the environment variables that have a letter H in the name, without printing the value of those variables.
$ printenv
SHELL=/bin/bash
QT_ACCESSIBILITY=1
NVM_RC_VERSION=
COLORTERM=truecolor
HOMEBREW_PREFIX=/home/linuxbrew/.linuxbrew
DESKTOP_SESSION=i3
...
PWD=/home/user
LOGNAME=user
MANPATH=/home/linuxbrew/.linuxbrew/share/man:
XDG_SESSION_DESKTOP=i3
XAUTHORITY=/run/user/1000/gdm/Xauthority
WINDOWPATH=2
SHELL=/bin/bash
SSH_AGENT_PID=2900
HOME=/home/user
HOMEBREW_SHELLENV_PREFIX=/home/linuxbrew/.linuxbrew
USERNAME=user
$

Expected output:

$ ./env-format.sh
/home/user/Documents/public/sh/tests/student
SHELL
SSH_AGENT_PID
HOMEBREW_SHELLENV_PREFIX
MANPATH
XAUTHORITY
WINDOWPATH
HOME
$