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What is the difference between [ test ] and [[ test ]] in bash?
When is one more appropriate than the other and what does the ; at the end do?
if [[ -z $DIRECTORY ]];
then
DIRECTORY=html
fi
if [ ! -d "$DIRECTORY" ]; then
echo installation directory "'${DIRECTORY}'" does not exist
exit 1
fi
[[is a bash keyword similar to (but more powerful than) the[command. See http://mywiki.wooledge.org/BashFAQ/031 and http://mywiki.wooledge.org/BashGuide/TestsAndConditionals Unless you’re writing for POSIX sh, we recommend[[.