intermittent bc parse error Post: 302549353

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Top Forums Shell Programming and Scripting intermittent bc parse error Post 302549353 by alister on Monday 22nd of August 2011 06:17:13 PM

08-22-2011

Registered User

The problem is that the df|awk|sed pipeline results in a leading blank line. That's interpreted by bc as the end of a statement.

Instead of awk '{print $3}' | sed s/Used//, you can use awk '!/Used/ {print $3}' or awk 'NR>1 {print $3}'.

On an unrelated note, I would suggest getting out of the habit of using backticks for command subsitution. You have nothing but pain to gain by using that obsolete syntax (the rules for quoting and nested substitutions are arcane and complex). $(...) is a lot simpler and saner.

Regards,
Alister

---------- Post updated at 06:17 PM ---------- Previous update was at 06:01 PM ----------

Quote:

Originally Posted by reid

Code:

 
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

To minimize repetition, I'd just set some parameters in the if statement. Otherwise, if you need to alter the command pipeline, you'll have to remember to do it more than once.

Code:

if [ $sizeRAW -lt 1757813 ]; then
    sdiv=1000000 sunit=M
else
    sdiv=1000000000 sunit=G
fi
sizeHUMAN=$(echo "scale=2; ($sizeRAW*512)/$sdiv" | bc)$sunit

The final awk to append the unit's abbreviation is not necessary. You can simply concatenate it in the shell.

Regards,

alister

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LEARN ABOUT ULTRIX

sortm

sortm(1mh) sortm(1mh)

Name
sortm - sort messages

Syntax
sortm [ msgs ] [ +folder ] [ options ]

Description
The command sorts all the messages in the current folder into chronological order according to the contents of the Date: fields of the mes-
sages.

By default, sorts all the messages in the current folder. You can select particular messages in the folder by giving a range of messages.
You can also sort messages in another folder by specifying the folder name.

If encounters a message without a Date: field, or if the message has a Date: field that cannot parse, it attempts to keep the message in
the same relative position. However, this does not always work; for instance, if the first message encountered lacks a date which can be
parsed, then it will usually be placed at the end of the messages being sorted.

When complains about a message which it cannot order, it complains about the message number prior to sorting.

Options
-datefield field
Specifies the name of the header field to use when making the date comparison. If you have a special field in each message, such
as Delivery-Date:, then the -datefield switch can be used to tell which field to examine. If you do not give this option, the
default is to use the Date: header field.

-help Prints a list of all the valid options to this command.

-verbose
-noverbose
Displays the general actions that it is taking to place the folder in sorted order. The -noverbose option performs these actions
silently. The default is -noverbose.

The default settings for this command are:

+folder defaults to the current folder
msgs defaults to all
-datefield date
-noverbose

Profile Components
Path: To determine your MH directory

Examples
The following example sorts all the messages in the folder
% sortm +meetings

The next example sorts messages 10-30 in the folder called
% sortm +test 10-30

Files
The user profile.

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