diff --git a/posix-configs/SITL/init/test/cmd_template.in b/posix-configs/SITL/init/test/cmd_template.in
index c856c175b15..d5f06d72c60 100644
--- a/posix-configs/SITL/init/test/cmd_template.in
+++ b/posix-configs/SITL/init/test/cmd_template.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 
diff --git a/posix-configs/SITL/init/test/test_mavlink b/posix-configs/SITL/init/test/test_mavlink
index b6692cdd309..f7179608687 100644
--- a/posix-configs/SITL/init/test/test_mavlink
+++ b/posix-configs/SITL/init/test/test_mavlink
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 
diff --git a/posix-configs/SITL/init/test/test_template.in b/posix-configs/SITL/init/test/test_template.in
index a7c68e92b6c..47f84eb9b95 100644
--- a/posix-configs/SITL/init/test/test_template.in
+++ b/posix-configs/SITL/init/test/test_template.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 
diff --git a/posix-configs/SITL/init/test/tests_all b/posix-configs/SITL/init/test/tests_all
index ba27bd95c64..feffce297d0 100644
--- a/posix-configs/SITL/init/test/tests_all
+++ b/posix-configs/SITL/init/test/tests_all
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 
diff --git a/posix-configs/bbblue/px4.config b/posix-configs/bbblue/px4.config
index 2221bac6ee7..8b4e4b63c0b 100644
--- a/posix-configs/bbblue/px4.config
+++ b/posix-configs/bbblue/px4.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # config for a quad
 # modified from ../rpi/px4.config
diff --git a/posix-configs/bbblue/px4_fw.config b/posix-configs/bbblue/px4_fw.config
index 51b876870c4..ec0c6379fc4 100644
--- a/posix-configs/bbblue/px4_fw.config
+++ b/posix-configs/bbblue/px4_fw.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # config for fixed wing (FW)
 # modified from ./px4.config, switch att/pos_control & mixer
diff --git a/posix-configs/bebop/px4.config b/posix-configs/bebop/px4.config
index 6c146b24edd..b7bfec150aa 100644
--- a/posix-configs/bebop/px4.config
+++ b/posix-configs/bebop/px4.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 param select /home/root/parameters
diff --git a/posix-configs/eagle/200qx/mainapp.config b/posix-configs/eagle/200qx/mainapp.config
index 8698c101777..c493b8bbf33 100644
--- a/posix-configs/eagle/200qx/mainapp.config
+++ b/posix-configs/eagle/200qx/mainapp.config
@@ -2,7 +2,7 @@
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 muorb start
diff --git a/posix-configs/eagle/210qc/mainapp.config b/posix-configs/eagle/210qc/mainapp.config
index 8698c101777..c493b8bbf33 100644
--- a/posix-configs/eagle/210qc/mainapp.config
+++ b/posix-configs/eagle/210qc/mainapp.config
@@ -2,7 +2,7 @@
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 muorb start
diff --git a/posix-configs/eagle/flight/mainapp.config b/posix-configs/eagle/flight/mainapp.config
index 8698c101777..c493b8bbf33 100644
--- a/posix-configs/eagle/flight/mainapp.config
+++ b/posix-configs/eagle/flight/mainapp.config
@@ -2,7 +2,7 @@
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 muorb start
diff --git a/posix-configs/eagle/init/rcS b/posix-configs/eagle/init/rcS
index 7bd3c972d34..220712416f0 100644
--- a/posix-configs/eagle/init/rcS
+++ b/posix-configs/eagle/init/rcS
@@ -2,7 +2,7 @@
 
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 muorb start
diff --git a/posix-configs/excelsior/mainapp.config b/posix-configs/excelsior/mainapp.config
index 20d4f9a31dd..6c9c6f717ba 100644
--- a/posix-configs/excelsior/mainapp.config
+++ b/posix-configs/excelsior/mainapp.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 muorb start
diff --git a/posix-configs/ocpoc/px4.config b/posix-configs/ocpoc/px4.config
index a1e137ec6ec..7d194021ea6 100644
--- a/posix-configs/ocpoc/px4.config
+++ b/posix-configs/ocpoc/px4.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 uorb start
 
diff --git a/posix-configs/rpi/px4.config b/posix-configs/rpi/px4.config
index 1a641203a72..a4f4a4c9980 100644
--- a/posix-configs/rpi/px4.config
+++ b/posix-configs/rpi/px4.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # navio config for a quad
 uorb start
diff --git a/posix-configs/rpi/px4_fw.config b/posix-configs/rpi/px4_fw.config
index 5dce1afc4ad..6a32cdab74f 100644
--- a/posix-configs/rpi/px4_fw.config
+++ b/posix-configs/rpi/px4_fw.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # navio config for FW
 
diff --git a/posix-configs/rpi/px4_hil.config b/posix-configs/rpi/px4_hil.config
index 6518dab5a17..39269639bd2 100644
--- a/posix-configs/rpi/px4_hil.config
+++ b/posix-configs/rpi/px4_hil.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # HITL configuration
 # connect to it with jMAVSim:
diff --git a/posix-configs/rpi/px4_no_shield.config b/posix-configs/rpi/px4_no_shield.config
index 9ea50cf3aa9..3bc9cbeee1b 100644
--- a/posix-configs/rpi/px4_no_shield.config
+++ b/posix-configs/rpi/px4_no_shield.config
@@ -1,7 +1,7 @@
 #!/bin/sh
 # PX4 commands need the 'px4-' prefix in bash.
 # (px4-alias.sh is expected to be in the PATH)
-source px4-alias.sh
+. px4-alias.sh
 
 # config for a quad without any shield:
 # - u-blox GPS connected via UART