05-28-2008
Quote:
Originally Posted by
ramky79
Hi,
how to write an if statement for values in between
if [$? -ne 0];then
fi
here I want to write an if statement if $? is inbetween 1 and 126
how to write this
if [$? inbetween 1 and 126];then
fi
I'd also like to know the difference between the following two if statements
if [$? -ne 0];then
fi
and
if [[$? -ne 0]];then
fi
Thanks for your time.
Ram
Depends on which shell you are using. The "[" version of test is the original one and tends to be an external program. Newer shells have "[[" which is a built in one and thus more efficient. You might also have "((" which is specifically for numeric stuff which means that you can use normal numeric comparisons rather than -ne, -eq etc.
To do an "in between" test with any of the above you need to use AND or OR depending on which way round you do it. AND is && and OR is ||
e.g.
if [ $val -lt 127 ] && [ $val -gt 0 ]
then
......
fi
there might be niftier ways with some shells (like doing the && or || inside a single test ) but it depends what you are using.
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RATFOR(1) General Commands Manual RATFOR(1)
NAME
ratfor - rational Fortran dialect
SYNOPSIS
ratfor [ option ... ] [ filename ... ]
DESCRIPTION
Ratfor converts a rational dialect of Fortran into ordinary irrational Fortran. Ratfor provides control flow constructs essentially iden-
tical to those in C:
statement grouping:
{ statement; statement; statement }
decision-making:
if (condition) statement [ else statement ]
switch (integer value) {
case integer: statement
...
[ default: ] statement
}
loops: while (condition) statement
for (expression; condition; expression) statement
do limits statement
repeat statement [ until (condition) ]
break [n]
next [n]
and some syntactic sugar to make programs easier to read and write:
free form input:
multiple statements/line; automatic continuation
comments:
# this is a comment
translation of relationals:
>, >=, etc., become .GT., .GE., etc.
return (expression)
returns expression to caller from function
define:
define name replacement
include:
include filename
The option -h causes quoted strings to be turned into 27H constructs. -C copies comments to the output, and attempts to format it neatly.
Normally, continuation lines are marked with a & in column 1; the option -6x makes the continuation character x and places it in column 6.
Ratfor is best used with f77(1).
SEE ALSO
f77(1)
B. W. Kernighan and P. J. Plauger, Software Tools, Addison-Wesley, 1976.
RATFOR(1)