diff --git a/ROMFS/px4fmu_common/init.d-posix/rc.replay b/ROMFS/px4fmu_common/init.d-posix/rc.replay
index 58a0ca96587..b378f826f8c 100644
--- a/ROMFS/px4fmu_common/init.d-posix/rc.replay
+++ b/ROMFS/px4fmu_common/init.d-posix/rc.replay
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # EKF2 replay script
 
diff --git a/ROMFS/px4fmu_common/init.d-posix/rcS b/ROMFS/px4fmu_common/init.d-posix/rcS
index 91c9cb7c8f2..15219d1c39e 100644
--- a/ROMFS/px4fmu_common/init.d-posix/rcS
+++ b/ROMFS/px4fmu_common/init.d-posix/rcS
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
diff --git a/platforms/posix/src/px4-alias.sh_in b/platforms/posix/src/px4-alias.sh_in
index 5d806f8f4f2..ad79af4c799 100644
--- a/platforms/posix/src/px4-alias.sh_in
+++ b/platforms/posix/src/px4-alias.sh_in
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # File is auto-generated by cmake compilation, do not edit.
 
diff --git a/posix-configs/SITL/init/test/cmd_template.in b/posix-configs/SITL/init/test/cmd_template.in
index 33251e67d65..c856c175b15 100644
--- a/posix-configs/SITL/init/test/cmd_template.in
+++ b/posix-configs/SITL/init/test/cmd_template.in
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/SITL/init/test/tests_all b/posix-configs/SITL/init/test/tests_all
index 2ea95eefd6e..ba27bd95c64 100644
--- a/posix-configs/SITL/init/test/tests_all
+++ b/posix-configs/SITL/init/test/tests_all
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/SITL/init/test/tests_template.in b/posix-configs/SITL/init/test/tests_template.in
index 85faca98b22..f31b7d09377 100644
--- a/posix-configs/SITL/init/test/tests_template.in
+++ b/posix-configs/SITL/init/test/tests_template.in
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/bbblue/px4.config b/posix-configs/bbblue/px4.config
index 56cbcb9dc47..2221bac6ee7 100644
--- a/posix-configs/bbblue/px4.config
+++ b/posix-configs/bbblue/px4.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/bbblue/px4_fw.config b/posix-configs/bbblue/px4_fw.config
index 4e9f710a519..51b876870c4 100644
--- a/posix-configs/bbblue/px4_fw.config
+++ b/posix-configs/bbblue/px4_fw.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/bebop/px4.config b/posix-configs/bebop/px4.config
index 55e4340bc99..6c146b24edd 100644
--- a/posix-configs/bebop/px4.config
+++ b/posix-configs/bebop/px4.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/eagle/200qx/mainapp.config b/posix-configs/eagle/200qx/mainapp.config
index eca8d025ed5..8698c101777 100644
--- a/posix-configs/eagle/200qx/mainapp.config
+++ b/posix-configs/eagle/200qx/mainapp.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
diff --git a/posix-configs/eagle/210qc/mainapp.config b/posix-configs/eagle/210qc/mainapp.config
index eca8d025ed5..8698c101777 100644
--- a/posix-configs/eagle/210qc/mainapp.config
+++ b/posix-configs/eagle/210qc/mainapp.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
diff --git a/posix-configs/eagle/flight/mainapp.config b/posix-configs/eagle/flight/mainapp.config
index eca8d025ed5..8698c101777 100644
--- a/posix-configs/eagle/flight/mainapp.config
+++ b/posix-configs/eagle/flight/mainapp.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
diff --git a/posix-configs/eagle/init/rcS b/posix-configs/eagle/init/rcS
index 8d8b1225844..7bd3c972d34 100644
--- a/posix-configs/eagle/init/rcS
+++ b/posix-configs/eagle/init/rcS
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
diff --git a/posix-configs/excelsior/mainapp.config b/posix-configs/excelsior/mainapp.config
index 415bc5b4205..20d4f9a31dd 100644
--- a/posix-configs/excelsior/mainapp.config
+++ b/posix-configs/excelsior/mainapp.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/ocpoc/px4.config b/posix-configs/ocpoc/px4.config
index af40c1406b5..a1e137ec6ec 100644
--- a/posix-configs/ocpoc/px4.config
+++ b/posix-configs/ocpoc/px4.config
@@ -1,41 +1,41 @@
-#!/usr/bin/bash
-# PX4 commands need the 'px4-' prefix in bash.
-# (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
-
-uorb start
-
-param select /root/rootfs/eeprom/parameters
-if [ -f /root/rootfs/eeprom/parameters ]
-then
-	param load
-fi
-param set SYS_AUTOSTART 4001
-param set MAV_BROADCAST 1
-param set MAV_TYPE 2
-param set MAV_SYS_ID 1
-param set SYS_MC_EST_GROUP 2
-
-df_mpu9250_wrapper start_without_mag -R 10
-df_hmc5883_wrapper start -D /dev/i2c-4
-df_ms5611_wrapper start
-rgbled start -b 1
-ocpoc_adc start
-gps start -d /dev/ttyS3 -s
-sensors start
-commander start
-navigator start
-dataman start
-ekf2 start
-land_detector start multicopter
-mc_pos_control start
-mc_att_control start
-
-mavlink start -x -d /dev/ttyPS1
-mavlink stream -d /dev/ttyPS1 -s HIGHRES_IMU -r 50
-mavlink stream -d /dev/ttyPS1 -s ATTITUDE -r 50
-
-linux_sbus start -d /dev/ttyS2 -c 10
-linux_pwm_out start -p ocpoc_mmap -m ROMFS/px4fmu_common/mixers/ocpoc_quad_x.main.mix
-logger start -t -b 200
-mavlink boot_complete
+#!/bin/sh
+# PX4 commands need the 'px4-' prefix in bash.
+# (px4-alias.sh is expected to be in the PATH)
+source px4-alias.sh
+
+uorb start
+
+param select /root/rootfs/eeprom/parameters
+if [ -f /root/rootfs/eeprom/parameters ]
+then
+	param load
+fi
+param set SYS_AUTOSTART 4001
+param set MAV_BROADCAST 1
+param set MAV_TYPE 2
+param set MAV_SYS_ID 1
+param set SYS_MC_EST_GROUP 2
+
+df_mpu9250_wrapper start_without_mag -R 10
+df_hmc5883_wrapper start -D /dev/i2c-4
+df_ms5611_wrapper start
+rgbled start -b 1
+ocpoc_adc start
+gps start -d /dev/ttyS3 -s
+sensors start
+commander start
+navigator start
+dataman start
+ekf2 start
+land_detector start multicopter
+mc_pos_control start
+mc_att_control start
+
+mavlink start -x -d /dev/ttyPS1
+mavlink stream -d /dev/ttyPS1 -s HIGHRES_IMU -r 50
+mavlink stream -d /dev/ttyPS1 -s ATTITUDE -r 50
+
+linux_sbus start -d /dev/ttyS2 -c 10
+linux_pwm_out start -p ocpoc_mmap -m ROMFS/px4fmu_common/mixers/ocpoc_quad_x.main.mix
+logger start -t -b 200
+mavlink boot_complete
diff --git a/posix-configs/rpi/px4.config b/posix-configs/rpi/px4.config
index cdcfcf9494c..1a641203a72 100644
--- a/posix-configs/rpi/px4.config
+++ b/posix-configs/rpi/px4.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/rpi/px4_fw.config b/posix-configs/rpi/px4_fw.config
index b759ee22f7e..5dce1afc4ad 100644
--- a/posix-configs/rpi/px4_fw.config
+++ b/posix-configs/rpi/px4_fw.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/rpi/px4_hil.config b/posix-configs/rpi/px4_hil.config
index 961a410c9c3..6518dab5a17 100644
--- a/posix-configs/rpi/px4_hil.config
+++ b/posix-configs/rpi/px4_hil.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/posix-configs/rpi/px4_no_shield.config b/posix-configs/rpi/px4_no_shield.config
index 75649c3de16..9ea50cf3aa9 100644
--- a/posix-configs/rpi/px4_no_shield.config
+++ b/posix-configs/rpi/px4_no_shield.config
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
 source px4-alias.sh
diff --git a/src/modules/local_position_estimator/fault_table.py b/src/modules/local_position_estimator/fault_table.py
index 8a9eccf84e7..9c84074836c 100644
--- a/src/modules/local_position_estimator/fault_table.py
+++ b/src/modules/local_position_estimator/fault_table.py
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env python
 from __future__ import print_function
 import pylab as pl
 import scipy.optimize