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(sh-utils.info)String tests

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String tests
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   These options test string characteristics.  Strings are not quoted
for `test', though you may need to quote them to protect characters
with special meaning to the shell, e.g., spaces.

`-z STRING'
     True if the length of STRING is zero.

`-n STRING'
`STRING'
     True if the length of STRING is nonzero.

`STRING1 = STRING2'
     True if the strings are equal.

`STRING1 != STRING2'
     True if the strings are not equal.