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Full Discussion: BC calculation for floating (invalid arithmetic operator )
Top Forums Shell Programming and Scripting BC calculation for floating (invalid arithmetic operator ) Post 302976500 by Don Cragun on Thursday 30th of June 2016 12:56:15 AM
Old 06-30-2016
The assignment command:
Code:
warn_level=$((1.03 * (str2 < str3 ? str2 : str3)))

assigns the result of the arithmetic expression:
Code:
1.03 * (str2 < str3 ? str2 : str3)

to the variable warn_level. As in the awk programming language and in the C programming language, the expression:
Code:
expr1 ? expr2 : expr3

evaluates expr1 and if it yields a non-zero value the result of the above expression is whatever expr2 evaluates to; otherwise, the result of the above expression is whatever expr3 evaluates to. In this case, the entire expression evaluates to the multiplication of 1.03 times the minimum of $str2 and $str3.

Note also that using the shell's set special built-in, three variable assignments and 2 variable expansions is MUCH more efficient that using three command assignments each of which invokes a command substitution which in turn also invokes the external utility awk and the external utility sed.
 

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LEARN ABOUT SUSE

cpufreq-set

cpufreq-set(1)															    cpufreq-set(1)

NAME

       cpufreq-set - A small tool which allows to modify cpufreq settings.

SYNTAX

       cpufreq-set [options]

DESCRIPTION

       cpufreq-set  allows you to modify cpufreq settings without having to type e.g. "/sys/devices/system/cpu/cpu0/cpufreq/scaling_set_speed" all
       the time.

OPTIONS

       -c --cpu <CPU>
	      number of CPU where cpufreq settings shall be modified.

       -d --min <FREQ>
	      new minimum CPU frequency the governor may select.

       -u --max <FREQ>
	      new maximum CPU frequency the governor may select.

       -g --governor <GOV>
	      new cpufreq governor.

       -f --freq <FREQ>
	      specific frequency to be set. Requires userspace governor to be available and loaded.

       -r --related
	      modify all hardware-related CPUs at the same time

       -h --help
	      Prints out the help screen.

REMARKS

       Omitting the -c or --cpu argument is equivalent to setting it to zero.

       The -f FREQ, --freq FREQ parameter cannot be combined with any other parameter except the -c CPU, --cpu CPU parameter.

       FREQuencies can be passed in Hz, kHz (default), MHz, GHz, or THz by postfixing the value with the wanted unit name, without any space (fre-
       quency in kHz =^ Hz * 0.001 =^ MHz * 1000 =^ GHz * 1000000).

       On Linux kernels up to 2.6.29, the -r or --related parameter is ignored.

FILES

       /sys/devices/system/cpu/cpu*/cpufreq/
       /proc/cpufreq (deprecated)
       /proc/sys/cpu/ (deprecated)

AUTHORS

       Dominik Brodowski <linux@brodo.de> - author
       Mattia Dongili<malattia@gmail.com> - first autolibtoolization

SEE ALSO

       cpufreq-info(1)

Mattia Dongili								0.1							    cpufreq-set(1)
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