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I will get value like 2743410360.320 and I want value like 2743410360 to a variable.

I tried

INTValueOfGB=$ echo "($gb+0.5)/1" | bc

But I am getting (standard_in) 1: syntax error

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Please check that your code's syntax is still the one you intended to post after I edited it. (That solitary $ sign looks quite interesting.) – manatwork Nov 15 '13 at 11:23

You can use printf for rounding:

$ printf "%.0f" 2743410360.320
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In bash 4.1 the builtin printf says “invalid number”. Works fine with /usr/bin/printf. – manatwork Nov 15 '13 at 11:39
@manatwork Works for me with bash 4.1.5 on Debian squeeze and even bash 3.2.39 on Ubuntu 8.04. – Gilles Nov 16 '13 at 22:18
Indeed. Works fine in bash 4.2. Or maybe the problem was not the version – the first try was on Cygwin. – manatwork Nov 17 '13 at 12:36
I tried it is not working fine when i am passing a value $ printf "%.0f" $gb – vin Nov 18 '13 at 5:58
@manatwork: Are you using %i or %.0f? The former says 'invalid number' for me, the latter works. – Flimzy Mar 6 '15 at 15:14
$ p=2743410360.320
$ echo $p
$ echo ${p%%.*}
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The +0.5 in the original code looks like rounding is needed. – manatwork Nov 15 '13 at 11:36

Your command needs a couple of ( ):

INTValueOfGB=$( echo "($gb+0.5)/1" | bc )

But that will not round the number, for that to work you need to set scale to 0:

INTValueOfGB=$( echo "scale=0;($gb+0.5)/1" | bc )

That will round up (from x.5) to the next integer.

To get "round to next even integer" (Banker's rule), you need to use printf rounding:

LC_NUMERIC=C printf "%.0f" 2743410360.320

The LC_NUMERIC is to ensure that numbers are processed with a dot as decimal. That is not what users in Germany will like to use, this should work with decimals with ,:

$ LC_NUMERIC=de_DE.utf8 printf "%.0f" 2743410360,320
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I don't see an answer to @vin's problem, which is:

But I am getting (standard_in) 1: syntax error

The bc command prints (standard_in) 1: syntax error because the shell variable gb is not set:

$ unset gb
$ echo "($gb+0.5)/1" | bc
(standard_in) 1: syntax error

$ gb=2743410360.320
$ echo "($gb+0.5)/1" | bc

In the comments to the @dchirikov's answer, @vin says printf "%.0f" is "not working":

$ unset gb
$ printf '%.0f\n' $gb

$ gb=2743410360.320
$ printf '%.0f\n' $gb

In both of the areas where @vin has problems, the unset variable reproduces the problem, and setting the variable solves the problem.

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