The less-than sign plus the equals sign (<=) is used for an approximation of the less-than-or-equal-to sign (≤).
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In Bash, Perl, and Ruby, operator <<EOF (where "EOF" is an arbitrary string, but commonly "EOF" denoting "end of file") is used to denote the beginning of a here document.
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In BASIC, Lisp-family languages, and C-family languages (including Java and C++), operator <= means "less than or equal to".
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