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(sh-utils.info)Relations for expr

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Relations for `expr'
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   `expr' supports the usual logical connectives and relations.  These
are higher precedence than either the string or numeric operators
(previous sections).  Here is the list, lowest-precedence operator
first.

`|'
     Returns its first argument if that is neither null nor 0,
     otherwise its second argument.

`&'
     Return its first argument if neither argument is null or 0,
     otherwise 0.

`< <= = == != >= >'
     Compare the arguments and return 1 if the relation is true, 0
     otherwise.  `==' is a synonym for `='.  `expr' first tries to
     convert both arguments to numbers and do a numeric comparison; if
     either conversion fails, it does a lexicographic comparison.