3 .sh files: Change shebang to simply /bin/sh

app/docker-entrypoint.sh

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 # Abort the entire script if an error occurs
 set -e
 

app/pg_dump.sh

@@ -1 +1,3 @@
-PGPASSWORD="$JOB_HISTORY_DB_PASSWORD" pg_dump --file=backup_to_restore.sql --format=p --clean --encoding=utf8 --if-exists --dbname=$JOB_HISTORY_DB_NAME --host=$JOB_HISTORY_DB_HOST --port=$JOB_HISTORY_DB_PORT --username=$JOB_HISTORY_DB_USERNAME
+#!/bin/sh
+
+PGPASSWORD="$JOB_HISTORY_DB_PASSWORD" pg_dump --file=backup_to_restore.sql --format=p --clean --encoding=utf8 --if-exists --dbname="$JOB_HISTORY_DB_NAME" --host="$JOB_HISTORY_DB_HOST" --port=$JOB_HISTORY_DB_PORT --username="$JOB_HISTORY_DB_USERNAME"

app/tcp-port-wait.sh

@@ -1,15 +1,17 @@
+#!/bin/sh
+
 set -e
 
-if [ -z "$1" -o -z "$2" ]
+if [ -z "$1" ] || [ -z "$2" ]
 then
     echo "tcp-port-wait - block until specified TCP port becomes available"
-    echo "Usage: ntcp-port-wait HOST PORT"
+    echo "Usage: tcp-port-wait HOST PORT"
     exit 1
 fi
-echo Waiting for port $1:$2 to become available...
-while ! nc -z $1 $2 2>/dev/null
+echo Waiting for port "$1":$2 to become available...
+while ! nc -z "$1" $2 2>/dev/null
 do
-    let elapsed=elapsed+1
+    elapsed=$elapsed+1
     if [ "$elapsed" -gt 90 ] 
     then
         echo "TIMED OUT !"