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Full Discussion: How to read from file and convert from string to integer?
Top Forums Shell Programming and Scripting How to read from file and convert from string to integer? Post 302920995 by rbatte1 on Tuesday 14th of October 2014 06:09:13 AM
Old 10-14-2014
You might have a few issues to deal with. The use of a file is not really needed as you can use a pipe directing into your while read .... statement:-
Code:
top -bn 1 | grep "^ " | while read pid . . . . . . . cpu mem . command .
do
   :
   :

The full-stops in the while read part are just place holders, so you can see I pick out the columns you are after without needed an awk at all.

That will get the values, but if you look at your output (content currently in $filename) presumably has the header record in it, so the first read gets the value %CPU which is not an integer. The other lines do get numeric values, but they are decimal rather than integers and are therefore considered by the test as strings.

We can test and ignore the %CPU record, but the decimal will be a problem. Are you worried about the tenths, or can we truncate them? We can use variable substitution to split the string into the two parts like this:-
Code:
whole_bit="${cpu%.*}"
tenth_bit="${cpu#*.}"

You then have the two parts to work with as you please. I'm guessing that as your later test if for over 90% CPU, then the tenths are not a problem and you can just test if $whole_bit is greater than or equal to 90. I'd probably use the -ge notation.


Does this help, or does it just leave you stuck elsewhere?



Robin
 

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LEARN ABOUT NETBSD

cpuset_isset

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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