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Shell Programming and Scripting
script not working after "tail -f"
Post 302124504 by xander on Sunday 1st of July 2007 03:58:15 PM
07-01-2007
script not working after "tail -f"
Hi Everyone ,
I am facing a strange problem
i have made the follwing script to watch a appending log file (abc.log) but its not moving after the line tail -f ,
any suggestions
=====================================
#!/bin/bash
while true
do
tail -f abc.log | grep "exceptions"
echo hi
done
===================================
but the script keeps on giving the exceptions output as follows:
exception.TaxStrategyException: Error during port.getTax
exception.InterfaceException: Error MNP duplicate found
exception.CardPaymentException: Payment gateway rejected
and i want the out put to be as follows :------
exception.TaxStrategyException: Error during port.getTax
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.CardPaymentException: Payment gateway rejected
hi
================================================
the basic problem i have seen is that tail -f keeps on checking the appending log file due to which it doesnot ends up and the second command
echo hi never gets executed.
Please help me if there is any other way of doing this
Thanks
I am facing a strange problem
i have made the follwing script to watch a appending log file (abc.log) but its not moving after the line tail -f ,
any suggestions
=====================================
#!/bin/bash
while true
do
tail -f abc.log | grep "exceptions"
echo hi
done
===================================
but the script keeps on giving the exceptions output as follows:
exception.TaxStrategyException: Error during port.getTax
exception.InterfaceException: Error MNP duplicate found
exception.CardPaymentException: Payment gateway rejected
and i want the out put to be as follows :------
exception.TaxStrategyException: Error during port.getTax
hi
exception.InterfaceException: Error MNP duplicate found
hi
exception.CardPaymentException: Payment gateway rejected
hi
================================================
the basic problem i have seen is that tail -f keeps on checking the appending log file due to which it doesnot ends up and the second command
echo hi never gets executed.
Please help me if there is any other way of doing this
Thanks
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LEARN ABOUT SUNOS
log2
log2(3M) Mathematical Library Functions log2(3M) NAME
log2, log2f, log2l - compute base 2 logarithm functions SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <math.h> double log2(double x); float log2f(float x); long double log2l(long double x); DESCRIPTION
These functions compute the base 2 logarithm of their argument x, log2(x). RETURN VALUES
Upon successful completion, these functions return the base 2 logarithm of x. If x is +-0, a pole error occurs and log2(), log2f(), and log2l() return -HUGE_VAL, -HUGE_VALF, and -HUGE_VALL, respectively. For finite values of x that are less than 0, or if x is -Inf a domain error occurs and a NaN is returned. If x is NaN, a NaN is returned. If x is 1, +0 is returned. If x is +Inf, x is returned. ERRORS
These functions will fail if: Domain Error The finite value of x is less than 0, or x is -Inf. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception is raised. Pole Error The value of x is 0. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the divide-by-zero floating-point exception is raised. USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
feclearexcept(3M), fetestexcept(3M), log(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.10 1 Sep 2002 log2(3M)