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edited Apr 13, 2017 at 12:37

If you are using bash then rather than mixing [ and [[, you should stick with one or the other, preferrably [[. See What is the difference between test, [ and [[ ?

You might also want to consider preferring printf over echo for a more robust approach. See this amazingly detailed analysis of why printf is better than echowhy printf is better than echo.

If you are using bash then rather than mixing [ and [[, you should stick with one or the other, preferrably [[. See What is the difference between test, [ and [[ ?

You might also want to consider preferring printf over echo for a more robust approach. See this amazingly detailed analysis of why printf is better than echo.

If you are using bash then rather than mixing [ and [[, you should stick with one or the other, preferrably [[. See What is the difference between test, [ and [[ ?

You might also want to consider preferring printf over echo for a more robust approach. See this amazingly detailed analysis of why printf is better than echo.

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answered May 1, 2015 at 7:05

jasonwryan

If you are using bash then rather than mixing [ and [[, you should stick with one or the other, preferrably [[. See What is the difference between test, [ and [[ ?

You might also want to consider preferring printf over echo for a more robust approach. See this amazingly detailed analysis of why printf is better than echo.