On Wed, 2002-12-11 at 12:05, dbrett wrote:
> I have a bash to math calucations. It works but also complains about the
> last line, even though it works.
>
> Any ideas how to fix the problem or at least not see the error message and
> still work.
>
> #!/bin/bash
>
> if [$1 == '']; then
> echo ''
> echo "format is $0 'math equation'"
> echo "i.e. $0 (2+2)*3"
> echo ''
> exit
> fi
>
> echo $1 | /usr/bin/bc -l &2>/dev/null
>
only way I can get it to work is to quote the equation and fix the
syntax of the test statement.
#!/bin/bash
if [ -z $1 ]; then # spaces inside the [ ] -z test for null string
echo ''
echo "format is $0 'math equation'"
echo "i.e. $0 (2+2)*3"
echo ''
exit
fi
echo $1 | /usr/bin/bc -l 2>/dev/null
Roberts suggestion of dropping the &2> in favor of 2> fixed a really
funky newline thing I will have to figure out some day :)
[bhughes@bretsony bhughes]$ bc.test.sh
format is ./bc.test.sh 'math equation'
i.e. ./bc.test.sh (2+2)*3
[bhughes@bretsony bhughes]$ bc.test.sh (2+2)*3
bash: syntax error near unexpected token `(2+2)'
[bhughes@bretsony bhughes]$
[bhughes@bretsony bhughes]$ bc.test.sh '(2+2)*3'
12
HTH
Bret
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