feat(largest): add new bash exercise

- add subject, solution, test and support files

sh/tests/largest-dir/.abc

@@ -0,0 +1 @@
+ciao mamma guarda come mi diverto

sh/tests/largest-dir/folder1/.hello

@@ -0,0 +1 @@
+ciao mamma guarda qu

sh/tests/largest-dir/folder1/ab

@@ -0,0 +1 @@
+123

sh/tests/largest-dir/folder1/ac

@@ -0,0 +1 @@
+1

sh/tests/largest-dir/folder1/az

@@ -0,0 +1 @@
+12

sh/tests/largest-dir/folder1/bz

@@ -0,0 +1 @@
+12

sh/tests/largest-dir/folder1/cz

@@ -0,0 +1 @@
+12345678

sh/tests/largest-dir/folder1/za!

@@ -0,0 +1 @@
+12

sh/tests/largest-dir/folder2/aa/.salut

@@ -0,0 +1 @@
+123456

sh/tests/largest-dir/folder2/aa/aa

@@ -0,0 +1 @@
+12

sh/tests/largest-dir/folder2/aa/az

@@ -0,0 +1 @@
+123

sh/tests/largest-dir/folder2/ab

@@ -0,0 +1 @@
+123456

sh/tests/largest-dir/folder2/ba/.ola

@@ -0,0 +1 @@
+1234512312312312

sh/tests/largest-dir/folder2/ba/aa/.ciao

@@ -0,0 +1 @@
+123456

sh/tests/largest-dir/folder2/bz

@@ -0,0 +1 @@
+123

sh/tests/largest-dir/folder2/za!

@@ -0,0 +1 @@
+12312312312 12 312 312 12 3

sh/tests/largest_test.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+IFS='
+'
+
+FILENAME="student/largest.sh"
+script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
+
+challenge () {
+    submitted=$(cd "$1" && bash "$script_dirS"/"$FILENAME")
+    expected=$(cd "$1" && bash "$script_dirS"/solutions/largest.sh)
+
+    diff <(echo "$submitted") <(echo "$expected")
+}
+
+if [ $(cat "$script_dirS"/"$FILENAME" | grep echo) ]; then
+    echo "echo is not allowed in this exercise!" 
+    exit 1
+fi
+
+challenge largest-dir/folder1
+challenge largest-dir/folder2
+challenge largest-dir

sh/tests/solutions/largest.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash 
+
+find . -type f -exec ls -lha {} \; | sort -hrk5 | head -7 | awk '{printf("%5s | ", $5); print $NF}'

subjects/devops/largest/README.md

@@ -0,0 +1,46 @@
+## largest
+
+### Instructions
+
+Crate a script `largest.sh` that will look for, and display on the console, the seven biggest files in the current directory (including subdirectories) in a specific format.
+
+The script will also have to find and take into account hidden files.
+
+### Usage
+
+Here is an example of how to use the script:
+
+```console
+$  tree -ha
+[4.0K]  .
+├── [4.0K]  d1
+│   ├── [4.0K]  d1-1
+│   ├── [   2]  f1-1
+│   ├── [  27]  f1-2
+│   ├── [  24]  f1-3
+│   ├── [  24]  f1-4
+│   ├── [   3]  f2-1
+│   ├── [  34]  f2-2
+│   ├── [  38]  f2-3
+│   └── [  87]  .hf1-1
+├── [   5]  f1
+├── [  18]  f2
+└── [  34]  f3
+
+2 directories, 11 files
+$ bash largest.sh | cat -e
+   87 | ./d1/.hf1-1$
+    5 | ./f1$
+    3 | ./d1/f2-1$
+   38 | ./d1/f2-3$
+   34 | ./d1/f2-2$
+   34 | ./f3$
+    2 | ./d1/f1-1$
+$
+```
+
+> The output needs to be formatted as the example shown above
+
+### Hints
+
+- `awk` might be handy