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On Thu, Jun 22, 2006 at 10:15:22PM -0700, Durai raj wrote:
> Hi All,
>
> How to specify the precedence in the if/while loop?
> In C,
>
> if( i<j && (j>k || k<i) )
One uses -lt (less than) and -gt (greater than)
(You can look at man(1) test and of course, man sh.)
The test command is represented by [ ]. You need white space between the
bracket and what you write, for example
if [ a -gt b ]; then
do something
if [a -gt b] won't work.
You can use && and || for the and and the or.
So,
if [ i -gt j ] && [ j -gt k ] || [ k -lt i ];
then
do something.
Also, of course, there's alway another way--you can use -a for and and
- -o for or. In this case, it goes in the same bracket, eg
if [ a -gt b -a j -gt k -o k -lt i ]; then
do something
I'm being lazy here. As all these letters (a, b, j k and i are
variables and each one should probably be written "${a}" "${b}" etc, in
quotes as shown.
if [ "${a}" -gt "${b}" -a "${j}" -gt "${k}" ];
- --
Scott Robbins
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