From b2c81baa393ea5bc19fb724d89e1a85c8a02e8b9 Mon Sep 17 00:00:00 2001
From: miguel <miguel-silva98@hotmail.com>
Date: Wed, 21 Dec 2022 16:52:12 +0000
Subject: [PATCH] feat(set-env-vars): add subject, test and solution for the
 exercise

---
 sh/tests/set-env-vars_test.sh          | 11 ++++
 sh/tests/solutions/set-env-vars.sh     |  7 +++
 subjects/devops/env-format/README.md   |  2 +-
 subjects/devops/set-env-vars/README.md | 70 ++++++++++++++++++++++++++
 4 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100755 sh/tests/set-env-vars_test.sh
 create mode 100755 sh/tests/solutions/set-env-vars.sh
 create mode 100644 subjects/devops/set-env-vars/README.md

diff --git a/sh/tests/set-env-vars_test.sh b/sh/tests/set-env-vars_test.sh
new file mode 100755
index 00000000..c1dc6294
--- /dev/null
+++ b/sh/tests/set-env-vars_test.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+submitted=$(bash student/set-env-vars.sh)
+expected=$(bash solutions/set-env-vars.sh)
+
+diff <(echo "$submitted") <(echo "$expected")
diff --git a/sh/tests/solutions/set-env-vars.sh b/sh/tests/solutions/set-env-vars.sh
new file mode 100755
index 00000000..712c43a7
--- /dev/null
+++ b/sh/tests/solutions/set-env-vars.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+export MY_MESSAGE="Hello World"
+export MY_NUM=100
+export MY_PI=3.142
+export MY_ARR=(one, two, three, four, five)
+printenv
diff --git a/subjects/devops/env-format/README.md b/subjects/devops/env-format/README.md
index 23ed820c..4fb31ab8 100644
--- a/subjects/devops/env-format/README.md
+++ b/subjects/devops/env-format/README.md
@@ -8,7 +8,7 @@ Create a script `env-format.sh`, which will print the environment variables that
 - All the environment variables that have a letter `H` in the name, without printing the value of those variables.
 
 ```console
-$ print env
+$ printenv
 SHELL=/bin/bash
 QT_ACCESSIBILITY=1
 NVM_RC_VERSION=
diff --git a/subjects/devops/set-env-vars/README.md b/subjects/devops/set-env-vars/README.md
new file mode 100644
index 00000000..5b2869f2
--- /dev/null
+++ b/subjects/devops/set-env-vars/README.md
@@ -0,0 +1,70 @@
+## set-env-vars
+
+### Instructions
+
+Create a script `set-env-vars.sh`, which will allow you to set the following variables as environment variables and and print them all:
+
+- `MY_MESSAGE` which contains the string `"Hello World"`.
+- `MY_NUM` which contains the number `100`.
+- `MY_PI` which contains the number `3.142`.
+
+Expected output:
+
+```console
+$ printenv  # The env variables present are just an example, yours will be different.
+SHELL=/bin/bash
+TERM=xterm
+USER=demouser
+LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca:...
+MAIL=/var/mail/demouser
+PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+PWD=/home/demouser
+LANG=en_US.UTF-8
+SHLVL=1
+HOME=/home/demouser
+LOGNAME=demouser
+LESSOPEN=| /usr/bin/lesspipe %s
+LESSCLOSE=/usr/bin/lesspipe %s %s
+_=/usr/bin/printenv
+$ ./set-env-vars.sh
+MY_NUM=100
+SHELL=/bin/bash
+TERM=xterm
+USER=demouser
+LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca:...
+MAIL=/var/mail/demouser
+PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+PWD=/home/demouser
+LANG=en_US.UTF-8
+MY_PI=3.142
+SHLVL=1
+HOME=/home/demouser
+LOGNAME=demouser
+MY_MESSAGE=Hello World
+LESSOPEN=| /usr/bin/lesspipe %s
+LESSCLOSE=/usr/bin/lesspipe %s %s
+_=/usr/bin/printenv
+$
+```
+
+### Hints
+
+Setting values to environment variables
+
+In order to set a value to an existing environment variable, we use an assignment expression. For instance, to set the value of the "LANG" variable to "he_IL.UTF-8", we use the following command:
+
+```console
+$ LANG=he_IL.UTF-8
+```
+
+If we use an assignment expression for a variable that doesn't exist, the shell will create a shell variable, which is similar to an environment variable but does not influence the behaviour of other applications.
+
+A shell variable can be exported to become an environment variable with the export command. To create the "EDITOR" environment variable and assign the value "nano" to it, you can do:
+
+```console
+$ EDITOR=nano
+$export EDITOR
+```
+
+> You have to use Man or Google to know more about commands flags, in order to solve this exercise!
+> Google and Man will be your friends!