What does -n in if [ -n "${TEMP_FILE_LIST}" ] do?

shell unix

From help test:

  -n STRING     STRING      True if string is not empty.

shell unix

-n tests for a non-zero-length string

shell unix

if [ -n "${TEMP_FILE_LIST}" ]

tests if the argument "${TEMP_FILE_LIST}" does not have zero length.

You can also check

if [ ! -z "${TEMP_FILE_LIST}" ]

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