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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 CENTOS

cpu

CPU(8)                                                        System Manager's Manual                                                       CPU(8)

NAME

       cpu - A tool for user and group administration

SYNOPSIS

       cpu [OPTIONS]

DESCRIPTION

       CPU is a tool for user administration, that was initially based on FreeBSD's pw(8). This tool will allow you to administer users and groups
       on several different backends currently including LDAP and flat files. Please see the website http://cpu.sourceforge.net for more  informa-
       tion, or help improve the man page.

OPTIONS

       There are two kinds of options; options for CPU and options for CPU modules.  There are only four options for CPU, they are as follows:

       -C configfile, --config configfile
              The configuration file to be used by CPU. The options in this file are used for CPU modules.

       -h, --help
              Display help for CPU. If specified in conjunction with the -m option the help for that particular module is displayed.

       -M method, --method=method
              This  is  the method of administration. Current options are ldap or passwd (passwd is not yet working). This can be specified in the
              configuration file.

       -V, --version
              Display the version of the software.

SEE ALSO

       cpu.conf(5) cpu-ldap(8)

AUTHORS

       Blake Matheny <bmatheny@purdue.edu>

       The current version of this software is always availabe at http://cpu.sourceforge.net

BUGS

       To report a bug or problem, please e-mail:

       cpu-users@lists.sourceforge.net

TODO

       See TODO file that accompanied software. Please e-mail us with any additional suggestions.

                                                                 17 February 2003                                                           CPU(8)
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