On 30/10/2013, at 14:02, Jason McMillon <[email protected]> wrote:
> So I am the proud owner of a weather cape and beagle bone white and a newb > when it comes to bash scripting. > > Lets say I want to otput to the command line the relative humidity as a > percentage using a bash script. > > Getting the relative humidity is as easy as cat > /sys/bus/i2c/devices/1-0040/humidity1_input > > How do I assign this value to a variable in a bash script so that I can > manipulate it (specificall divide by 1000 to express as a percentage)? > > humidityInput=/sys/bus/i2c/devices/1-0040/humidity1_input > echo $humidityInput > > gives me /sys/bus/i2c/devices/1-0040/humidity1_input > > I have tried putting paranthesis, quotes, and single quotes around > "/sys/bus/i2c/devices/1-0040/humidity1_input" but can't get bash to assign > the value of the file to the variable. > > Any of you linux gurus want to help a new out? > > Thanks in advance! > > Jason First get any linux/unix book real soon now. If you do not know how to do this, you will stumble in many other things... You can find many used book very cheap. HI=`cat /sys/bus/i2c/devices/1-0040/humidity1_input` Using backquotes. Besides bash does not make calculations in floating point. You will need to use another tool, and there you have other reason to get an Unix/Linux book (not only a Bash book). Greetings Paulo Ferreira -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
