[shell basics] determine whether the directory is empty

Foreword

The blogger encounters a problem and wants to first determine whether a directory is empty. If it is empty, the camera driver needs to be installed; if it is not empty, you can continue to run the program;

shell

Copy after login

if [ "`ls -A /dev/video*`" = "" ]; then
 echo "/dev/video* is empty, install camera driver"
 cd /opt/pcie_v4l2_mono-master/
 sudo make clean
 make -j8
 sudo make insert
else
 echo "/dev/video* is not empty"
fi
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Reference

1. ​ ​Judging whether the directory is empty​​;

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