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Full Discussion: intermittent bc parse error
Top Forums Shell Programming and Scripting intermittent bc parse error Post 302549340 by reid on Monday 22nd of August 2011 05:01:22 PM
Old 08-22-2011
intermittent bc parse error
Thought I had this worked out, and the equations work fine on their own.

What I have is an if statement that checks the raw size of a folder. Smaller than a certain threshold and it returns a value in MB format, otherwise it returns it in GBs. Yes, I know that df and du return human readable values, no I do not want to use them because I'm running OS X 10.6 and am trying to maintain the same values the Finder will display.

Also, the reason I'm passing the raw size instead of just using df -gH is that my source might not necessarily be the root directory, it may be just the user's folder.



Code:
 
sizeRAW=`df "$source" | awk '{print $3}' | sed s/Used//`   #actually an if statement, uses either df or du to find the size depending upon it being a hard drive or a sub-folder.

if [ $sizeRAW -lt 1757813 ]; then
    
        sizeHUMAN=`echo "scale=2; ($sizeRAW*512)/1000000" | bc | awk '{print $1"M"}'`
    else
        sizeHUMAN=`echo "scale=2; ($sizeRAW*512)/1000000000" | bc | awk '{print $1"G"}'`
    fi

-x debug shows

Code:
+ '[' 496454408 -lt 1757813 ']'           
++ echo 'scale=2; (                       
496454408*512)/1000000000'              
++ bc                               
++ awk '{print $1"G"}'                    
(standard_in) 2: parse error               
(standard_in) 2: parse error               
+ sizeHUMAN=

The correct values are calculated in sizeRAW, and passed through the if statement and into the calculation for bc to handle. If I enter the same numbers at the command line, I get the correct value. Same is true if I set the value for sizeRAW and pass it to the calculation on the command line. For some reason, the script will occasionally error on this and other similar bc calculations.

Am I formatting the calculation incorrectly? Is there a better more acceptable way to do this?
 

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LEARN ABOUT SUNOS

rmf

RMF(1)                                                               [nmh-1.5]                                                              RMF(1)

NAME

       rmf - remove an nmh folder

SYNOPSIS

       rmf [+folder] [-interactive | -nointeractive] [-version] [-help]

DESCRIPTION

       Rmf removes all of the messages (files) within the specified (or default) folder, and then removes the folder (directory) itself.

       If  there  are  any  files  within the folder which are not a part of nmh, they will not be removed, and an error will be produced.  If the
       folder is given explicitly or the -nointeractive option is given, then the folder will be removed  without  confirmation.   Otherwise,  the
       user  will be asked for confirmation.  If rmf can't find the current folder, for some reason, the folder to be removed defaults to `+inbox'
       (unless overridden by user's profile entry "Inbox") with confirmation.

       If the folder being removed is a subfolder, the parent folder will become the new current folder, and rmf will produce  a  message  telling
       the user this has happened.  This provides an easy mechanism for selecting a set of messages, operating on the list, then removing the list
       and returning to the current folder from which the list was extracted.

       If rmf s used on a read-only folder, it will delete all the (private) sequences (i.e., "atr-seq-folder" entries) for this folder from  your
       context without affecting the folder itself.

       Rmf irreversibly deletes messages that don't have other links, so use it with caution.

FILES

       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS

       Path:                To determine the user's nmh directory
       Current-Folder:      To find the default current folder
       Inbox:               To find the default inbox

SEE ALSO

       rmm(1)

DEFAULTS

       `+folder' defaults to the current folder, usually with confirmation
       `-interactive' if +folder' not given, `-nointeractive' otherwise

CONTEXT

       Rmf  will  set the current folder to the parent folder if a subfolder is removed; or if the current folder is removed, it will make "inbox"
       current.  Otherwise, it doesn't change the current folder or message.

BUGS

       Although intuitively one would suspect that rmf works recursively, it does not.  Hence if you have a sub-folder within a folder,  in  order
       to rmf the parent, you must first rmf each of the children.

MH.6.8                                                             11 June 2012                                                             RMF(1)
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