Refactor variable assignments and improve script readability in validate-plex-backups.sh and validate-plex-recovery.sh

- Changed inline variable assignments to separate declaration and assignment for clarity.
- Updated condition checks and log messages for better readability and consistency.
- Added a backup of validate-plex-recovery.sh for safety.
- Introduced a new script run-docker-tests.sh for testing setup in Docker containers.
- Enhanced ssh-login.sh to improve condition checks and logging functionality.

move-backups.sh

@@ -1,28 +1,19 @@
 #!/bin/bash
 
-if [ ! "$(expr substr $(uname -s) 1 5)" == 'Linux' ]; then
+uname_str=$(uname -s)
+if [ ! "${uname_str:0:5}" == 'Linux' ]; then
 	exit 1
 fi
 
 source="/home/acedanger/backup/docker-data/"
 destination="/mnt/share/media/backups/docker-data/"
 
-command="rsync \
-	--archive --verbose --progress --dry-run --stats \
-	-e 'ssh' \
-	--include '*.gz' \
-	acedanger@ts-racknerd:$source $destination \
-	| fgrep 'Number of files' | cut -d' ' -f4 | tr -d ,"
-
-# echo 'Running command => '
-# echo $command
-
 num_files=$(rsync \
 	--archive --verbose --progress --dry-run --stats \
 	-e 'ssh' \
 	--include '*.gz' \
-	acedanger@ts-racknerd:$source $destination \
-	| fgrep 'Number of files' | cut -d' ' -f4 | tr -d ,
+	acedanger@ts-racknerd:"$source" "$destination" \
+	| grep -F 'Number of files' | cut -d' ' -f4 | tr -d ,
 	)
 
 # echo 'There are' "${num_files}" 'file(s) to be transferred.'
@@ -43,6 +34,6 @@ rsync \
 # send a notification to https://notify.peterwood.rocks/lab
 curl \
   -H priority:default \
-  -H tags:backups,${HOSTNAME} \
+  -H tags:backups,"${HOSTNAME}" \
   -d "The backups have been moved to the NAS." \
   https://notify.peterwood.rocks/lab