feat(job-regist): add new bash exercise

- are the current test cases enough?

sh/tests/job-regist_test.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+# create a function to be called everytime the process exit
+abort () {
+    rm exp.log job.log
+}
+
+trap 'abort' EXIT
+
+
+set -euo pipefail
+IFS='
+'
+script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
+
+SUBMITTED='student/job-regist.sh'
+EXPECTED='solutions/job-regist.sh'
+
+wait_bg_jobs () {
+    while [ -n "$(jobs | grep -i running)" ]; do
+        echo -n "."
+        sleep 1
+    done
+    echo
+}
+
+# test cases
+one_process () {
+    sleep 2 &
+    source $script_dirS/$1 
+}
+
+two_processes () {
+    sleep 3 &
+    sleep 4 &
+    source $script_dirS/$1 
+}
+
+one_process_and_kill () {
+    echo do something
+}
+
+one_process_and_suspend () {
+    echo do something
+}
+# end of test cases
+
+challenge () {
+    echo "testing $1 case"
+    $1 $SUBMITTED &
+    $1 $EXPECTED &
+    
+    wait_bg_jobs
+
+    diff <(cat exp.log) <(cat job.log)
+}
+
+challenge one_process
+challenge two_processes

sh/tests/solutions/job-regist.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+IFS='
+'
+PID=$(jobs -l %1 | grep -Eo '[\+\-] [0-9]+' | grep -Eo '[0-9]+')
+LOG_FILE="exp.log"
+
+while kill -0 "$PID" 2> /dev/null; do
+    echo $(date +"%F %T") - $(jobs %1) >> "$LOG_FILE"
+    sleep 1
+done

subjects/devops/job-regist/README.md

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+## job-regist
+
+### Instruction
+
+Create a script, `job-regist.sh`, that will be able to monitor a specific background job.
+
+The script needs to track the status of the first jobs spawned by the current terminal and periodically save the status into a `job.log` file. It must append the new update without modifying the previous content.
+
+Each update needs to be appended to the file with the current format: `YYYY-MM-DD hh:mm:ss - <job status>`
+
+The script should stop running as soon as the job it is tracking ends.
+
+### Usage
+
+Here an example of how the script should behave:
+
+```console
+$ sleep 10 &
+$ sleep 12 &
+$ source job-regist.sh
+$ cat job.log
+2023-02-08 10:37:50 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:51 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:52 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:53 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:54 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:55 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:56 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:57 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:58 - [1]+  Running                 sleep 10 &
+2023-02-08 10:37:59 - [1]+  Running                 sleep 10 &
+$
+```