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Full Discussion: Find max value problem
Top Forums Shell Programming and Scripting Find max value problem Post 302657285 by muffle on Sunday 17th of June 2012 04:16:34 AM
Old 06-17-2012
Find max value problem

I have a file about cpu load like this (the first column is time, the second column is cpu load):

11:34:01 0.10
11:34:37 0.05
11:35:13 0.03
11:35:59 0.06
11:38:00 0.02
11:38:09 0.17
11:39:48 0.06

I need to find the max value of the second column so I write the script as follows
Code:
max=0
cat a.txt | while read line
do
value=$(echo $line | awk '{print $2}')
if [ $(echo "$max < $value" | bc) -eq 1 ]; then
max=$value
fi
done
echo $max

this one bring the wrong max value. But when I edit with
Code:
while read line
do
..
done < a.txt

it brings the correct value. So why these bring the different answers. Please explain to me.
 

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CPUSET(3)						   BSD Library Functions Manual 						 CPUSET(3)

NAME
cpuset_create, cpuset_destroy, cpuset_zero, cpuset_set, cpuset_clr, cpuset_isset, cpuset_size -- dynamic CPU sets SYNOPSIS
#include <sched.h> cpuset_t * cpuset_create(void); void cpuset_destroy(cpuset_t *set); void cpuset_zero(cpuset_t *set); int cpuset_set(cpuid_t cpu, cpuset_t *set); int cpuset_clr(cpuid_t cpu, cpuset_t *set); int cpuset_isset(cpuid_t cpu, const cpuset_t *set); size_t cpuset_size(const cpuset_t *set); DESCRIPTION
This section describes the functions used to create, set, use and destroy the dynamic CPU sets. This API can be used with the POSIX threads, see pthread(3) and affinity(3). The ID of the primary CPU in the system is 0. FUNCTIONS
cpuset_create() Allocates and initializes a clean CPU-set. Returns the pointer to the CPU-set, or NULL on failure. cpuset_destroy(set) Destroy the CPU-set specified by set. cpuset_zero(set) Makes the CPU-set specified by set clean, that is, memory is initialized to zero bytes, and none of the CPUs set. cpuset_set(cpu, set) Sets the CPU specified by cpu in set. Returns zero on success, and -1 if cpu is invalid. cpuset_clr(cpu, set) Clears the CPU specified by cpu in the CPU-set set. Returns zero on success, and -1 if cpu is invalid. cpuset_isset(cpu, set) Checks if CPU specified by cpu is set in the CPU-set set. Returns the positive number if set, zero if not set, and -1 if cpu is invalid. cpuset_size(set) Returns the size in bytes of CPU-set specified by set. SEE ALSO
affinity(3), pset(3), sched(3), schedctl(8), kcpuset(9) HISTORY
The dynamic CPU sets appeared in NetBSD 5.0. BSD
November 2, 2011 BSD
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