Anyone know what if [ -z "${DTS}" ] ; then means

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Anyone know what if [ -z "${DTS}" ] ; then means

Does anyone know what the followig if expression means

if [ -z "${DTS}" ] ; then

What is DTS
What is -z

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-z <string> tests to see if <string>, in this case $DTS, is of zero length. Man test(1) for further information about test. As to what DTS refers to, all that I can say without actually seeing your script is that DTS is probably a string variable.

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