make bash work on bsd and linux

Other/check_curl old

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # startup checks
 
 if [ -z "$BASH" ]; then

Other/install-check_interface_table_v3t.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 apt-get install snmpd sudo perl libconfig-general-perl libdata-dumper-simple-perl libsort-naturally-perl libexception-class-perl libencode-perl make
 

Other/matrix-host-notification.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Based on original E-Mail Icinga2 notification
 
 PROG="$(basename $0)"

Other/matrix-service-notification.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Based on original E-Mail Icinga2 notification
 
 PROG="$(basename $0)"

check_coturn.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 SERVER_ADDRESS=""
 SECRET=""

check_curl.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Define the usage message
 usage() {

check_iowait.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Nagios plugin to check iowait on Linux
 
 if ! command -v iostat &>/dev/null; then
@@ -7,7 +7,7 @@ if ! command -v iostat &>/dev/null; then
   exit 1
 fi
 
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Nagios plugin to check iowait on Linux
 

check_iowait_proc.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 WARNING_THRESHOLD=10
 CRITICAL_THRESHOLD=20

check_iperf3.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 function print_help {
   echo "Usage: $0 --server SERVER --warning WARNING --critical CRITICAL --rsa-key RSA_KEY --username USERNAME --password PASSWORD"

check_uptime.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Get the uptime start time
 UPTIME_OUTPUT=$(uptime -s)

install.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # apt-get update && apt-get install -y git && cd /opt && git -C /opt/icinga2-checks pull || git clone https://git.dp15.us/dpanzer/icinga2-checks.git /opt/icinga2-checks && bash /opt/icinga2-checks/install.sh