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Shell Programming and Scripting
Reading multiple directories and file from them
Post 302902086 by Klipeti on Sunday 18th of May 2014 12:02:58 PM
05-18-2014
Reading multiple directories and file from them
Hello
I'm making script for Dallas temperature sensors (DS1820).
When a sensor is connected, it shows up as a directory in /sys/bus/w1/devices
in format 10-xxxxxxx. Inside the directory is a file called w1_slave which holds the temperature in format t=xxxxx.
Each sensor has unique 10-xxxxxxx directory.
I want to make script to go through all 10-xxxxxx folders and read the t=xxxxx from the w1_slave, then save it to file which is named like the directory of the sensor with current date: 10-xxxxxx_date.csv
Also, I use crontab to automatically run the script every 5 minutes, so I need to append new lines to the 10-xxxxxx_date.csv, not replace it!
I know how to read and save the t=xxxxx from w1_slave, but I don't know how to make script automatically go through all 10-xxxxxx folders!
Currently in my script I manually write the sensor's folder and manually write the file where the t=xxxxx is saved.
This is a problem, because what if one of the sensors must be changed or I want to use more or less sensors? I'd have to re-write many lines of the script!
Help is appreciated
I'm making script for Dallas temperature sensors (DS1820).
When a sensor is connected, it shows up as a directory in /sys/bus/w1/devices
in format 10-xxxxxxx. Inside the directory is a file called w1_slave which holds the temperature in format t=xxxxx.
Each sensor has unique 10-xxxxxxx directory.
I want to make script to go through all 10-xxxxxx folders and read the t=xxxxx from the w1_slave, then save it to file which is named like the directory of the sensor with current date: 10-xxxxxx_date.csv
Also, I use crontab to automatically run the script every 5 minutes, so I need to append new lines to the 10-xxxxxx_date.csv, not replace it!
I know how to read and save the t=xxxxx from w1_slave, but I don't know how to make script automatically go through all 10-xxxxxx folders!
Currently in my script I manually write the sensor's folder and manually write the file where the t=xxxxx is saved.
This is a problem, because what if one of the sensors must be changed or I want to use more or less sensors? I'd have to re-write many lines of the script!
Help is appreciated
Last edited by Klipeti; 05-18-2014 at 01:06 PM.. Reason: Forgot the mention detail
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LEARN ABOUT CENTOS
sensors
sensors(1) Linux User's Manual sensors(1) NAME
sensors - print sensors information SYNOPSIS
sensors [ options ] [ chips ] sensors -s [ chips ] sensors --bus-list DESCRIPTION
sensors is used to show the current readings of all sensor chips. sensors -s is used to set all limits as specified in the configuration file. sensors --bus-list is used to generate bus statements suitable for the configuration file. OPTIONS
-c, --config-file config-file Specify a configuration file. If no file is specified, the libsensors default configuration file is used. Use `-c /dev/null' to tem- porarily disable this default configuration file. -h, --help Print a help text and exit. -s, --set Evaluate all `set' statements in the configuration file and exit. You must be `root' to do this. If this parameter is not specified, no `set' statement is evaluated. -A, --no-adapter Do not show the adapter for each chip. -u Raw output. This mode is suitable for debugging and for post-processing of the output by scripts. It is also useful when writing a configuration file because it shows the raw input names which must be referenced in the configuration file. -v, --version Print the program version and exit. -f, --fahrenheit Print the temperatures in degrees Fahrenheit instead of Celsius. --bus-list Generate bus statements suitable for using in sensors.conf. Such bus statements are only needed if you have several chips sharing the same address on different buses of the same type. As bus numbers are usually not guaranteed to be stable over reboots, these statements let you refer to each bus by its name rather than numbers. FILES
/etc/sensors3.conf /etc/sensors.conf The system wide configuration file. See sensors.conf(5) for further details. SEE ALSO
sensors.conf(5) AUTHOR
Frodo Looijaard and the lm_sensors group http://www.lm-sensors.org/ lm-sensors 3 November 2012 sensors(1)