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=
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$i = 1 sets the value of $i to 1.
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+=
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$i += 2 increases the value of $i by 2. (Same as $i = $i + 2)
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-=
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$i -= 2 decreases the value of $i by 2. (Same as $i = $i - 2)
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*=
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$i *= $n increases the value of $i by a factor of the value of $n. (Same as $i = $i * $n)
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/=
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$i /= 3 divides the value of $i by 3. Note that integer arithmetic is used; thus, if $a=5, the command $a/=3; message "$a" yields 1, not 1.6667. (Same as $i = $i / 3)
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%=
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$i %= 5 changes the value of $i to the remainder of the value of $i divided by 5. (Same as $i = $i % 5)
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.=
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$s .= ".pub" concatenates the string .pub to the end of the string represented by $s. (Same as $s = $s . ".pub")
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&=
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$i &= 7 zeros all but the low order 3 bits of the value of $i. (Same as $i = $i & 7)
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|=
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$i |= 1 sets the low order bit of the value of $i to 1. (Same as $i = $i | 1)
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^=
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$i ^= 1 inverts the low order bit of the value of $i. For example, if $i is 5, sets $i to 4. (Same as $i = $i ^ 1)
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<<=
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$i <<= 2 multiplies the value of $i by 4. (Same as $i = $i << 2)
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>>=
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$i >>= 2 divides the value of $i by 4. (Same as $i = $i >> 2)
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