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expr will give you a quick way to do basic math from the CLI. Make sure you escape things like * and leave a space between operators and digits.
There are 7 alternatives - vote for the best!
If you can do better, submit your command here.
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Doesn't do decimals. Try this Perl command.
perl -le 'print 51.2 * 2'
bc does floating point, large powers and trig functions too
bc
3584
bc -l
73.14285714285714285714
bc
9223372036854775808
the comment above came out wrong
bc <<< 512*73584
bc -l <<< 512/773.14285714285714285714
bc <<< 512^79223372036854775808
if you don't care about decimals then try
echo $((512*7))you don't need to care about spaces nor escaping anything
All good solutions too. But the original wins for fewest number of keystrokes :-)
Also, the bc example above seems wrong.
echo "512*7" | bcwill work.
the bc examples use bash 'here string' operator, it won't work in other shells, but in bash it's the fewest keystrokes, and more versatile.
bc <<< 512*7is 12 keystrokes
expr 512 \* 7is 13 keystrokes
and in fact, it could just be
bc<<<512*7which is 10 keystrokes.
OK. I wasn't using bash when trying the '
OK. I wasn't using bash when trying the 'here string' solution so I didn't count its keystrokes. Good solution, if using bash.