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Condition for decimal numbers

 
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# 8  
Old 12-29-2010
Quote:
Originally Posted by streddy
rohon,

i get this output. output seems ok whr my input file has the value 3.4

whats the error ./str %:not found?

temp=/tmp/st
+ % [[ /tmp/st -gt 0.1 ]]
./str: %: not found
+ echo KO
KO
U don't have to include % sign. It's my command prompt. Simply write

Code:
 [[ `cat /tmp/st` -gt 0.1 ]] && echo OK || echo KO

R0H0N
# 9  
Old 12-29-2010
Quote:
Originally Posted by R0H0N
Code:
% [[ 0.3 -gt 0.1 ]]&& echo OK||echo KO
OK
% [[ 0.3 -lt 0.1 ]]&& echo OK||echo KO
KO

I think this only works on ksh93 which has built-in floating point arithmetic.

On bash, an error is generated...
Code:
$ [[ 0.3 -gt 0.1 ]]&& echo OK||echo KO
bash: [[: 0.3: syntax error: invalid arithmetic operator (error token is ".3")
KO

# 10  
Old 12-30-2010
Hi.

I know zsh as well can do floating-point, and there may be others.

For portability, I would use something similar to:
Quote:
Originally Posted by citaylor
This code will handle any floating point expression correctly.
The "bc" will return 0=false, or 1=true:
Code:
if [ "$(echo $temp \> 0.1 | bc)" -eq 1 ]; then ....

One also could create or Google for functions that might be useful in this situation.

Good luck ... cheers, drl
 
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