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

Question

What does -n do in if [ -n "${TEMP_FILE_LIST}" ] for this shell script?

+6

Oh chin boon Oct 3 '11 at 4:01

3 answers

-n tests for a string with zero length

+5

imm Oct 3 '11 at 4:03

 if [ -n "${TEMP_FILE_LIST}" ]

checks if the argument "${TEMP_FILE_LIST}" zero length.

You can also check

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

+4

Foo bah Oct 3 '11 at 4:05

Ignacio Vazquez-Abrams · Accepted Answer · 2011-10-03T04:02:42+0000

From help test :

  -n STRING STRING True if string is not empty.