v4l2-ctl error in script

I can use v4l2-ctl in command line like these: v4l2-ctl -d /dev/video1 -c focus_auto=0 v4l2-ctl -d /dev/video1 -c exposure_auto=0 But it has error when I run them as a script in a file. for example script.sh which contains these two lines and run it using sh script.sh or call it from c++ system() function: VIDIOC_S_EXT_CTRLS: failed: Invalid argument Error setting MPEG controls: Invalid argument why this error occurs?