A system administrator is writing a bash script to determine if a file count, stored in a variable named FILE_COUNT, is numerically greater than 25. Which of the following conditional expressions correctly performs this check?
[[ $FILE_COUNT -gt 25 ]]
[[ $FILE_COUNT = 25 ]]
[ $FILE_COUNT > 25 ]
[[ $FILE_COUNT > 25 ]]
The correct answer uses the -gt operator inside double square brackets [[ ]] to perform a numerical comparison. The -gt operator stands for 'greater than' and is used specifically for comparing integer values. The [[ $FILE_COUNT > 25 ]] expression is incorrect because the > operator, when used inside double square brackets, performs a lexicographical (alphabetical) string comparison, not a numerical one. The [ $FILE_COUNT > 25 ] expression is incorrect because within single square brackets [ ], which is an alias for the test command, the > character is interpreted as a standard output redirection operator, not a comparison operator. This would result in an error or create an empty file named '25'. The [[ $FILE_COUNT = 25 ]] expression is incorrect because the = (or ==) operator tests for string equality, it does not check if one value is greater than another.
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