backslash problem???

[dayananda.ms]

Hi All,
I am not getting output for the following script, can any one correct the script please and tell the reason???

echo Enter three number
read a b c

if [ \($a>10\) -a \($a<20\) ]
then
echo first number is in between 10 and 20
fi

if [ \($b>20\) -a \($b<30\) ]
then
echo the number in b/w 20 and 30
fi

if [ \($c>10\) -o \($c<11\) ]
then
echo the is below 11
fi

[deepinlife]

try this

echo Enter three number
read a b c

if [ '($a -lt 10)' -a '($a -gt 20)' ]
then
echo first number is in between 10 and 20
fi

if [ '($b>20)' -a '($b<30)' ]
then
echo the number in b/w 20 and 30
fi

if [ '($c>10)' -o '($c<11)' ]
then
echo the is below 11
fi

[dayananda.ms]

Ya thank you... this is working fine...

But what happen's to earlier code, if i add '\' its not working.
what is the reason?

[vsemaska]

Did you get errors like:
./a.bash[9]: cannot open 20): No such file or directory
./a.bash[14]: cannot open 30): No such file or directory
./a.bash[19]: cannot open 11): No such file or directory

If so, then the '>' and '<' in your script were interpreted as redirection. The \'s had nothing to do with the problem. Also, you should find files '20)' & '10)' in your directory.

To use '>' and '<' in 'if' statements you have to enclose the conditions in [[ ]] like this:

echo Enter three number
read a b c

if [[ ($a>10) && ($a<20) ]]
then
echo first number is in between 10 and 20
fi

if [[ ($b>20) && ($b<30) ]]
then
echo the number in b/w 20 and 30
fi

if [[ ($c>10) || ($c<11) ]]
then
echo the is below 11
fi

Note 2 things:
1) The \'s are not needed.
2) '&&' has to be used instead of '-a' and '||' instead of '-o'

EDIT: Also I think deepinlife's code doesn't work properly because it's comparing to literal strings in the 'if' statements. There's no variable expansion. Also, the last 'if' statement makes no sense.