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Top Forums Shell Programming and Scripting Shell script for creating log file and sending mail? Post 302602562 by DGPickett on Monday 27th of February 2012 05:35:18 PM
Old 02-27-2012
Check into the command 'comm', which takes 2 files or pipes of binary sorted lines, and marks them for one of three columns: a-only, b-only or both. It slides lines left to columns 2 and 3 using 1 or 2 tabs. If you option it -3, it removes all lines in the both column, -13 says remove a and both, leaving no tabs and just what is in file b only. Think of it as robust set arithmetic. In ksh and bash, a neat form sorting on a generated name pipe is:
Code:
( export LC_ALL=C ; comm -13 <( sort file-a ) <(sort file-b ) )

The LC_ALL not C can upset newer sort versions so the sort order can be very strange if not broken.

You can easily post-process the comm output to differentiate a-not-b from b-not-a. The sort input does not need to be a file, it could be:
Code:
comm -3 <(
    cd dir-a ; find * -type f | sort
  ) <(
    cd dir-b ; find * -type f | sort
  )| sed '
        s/^\t/B:/    # \t here represents an actual tab in the sed script
        t
        s/^/A:/


Last edited by DGPickett; 02-27-2012 at 06:43 PM..
 

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rmf(1)							      General Commands Manual							    rmf(1)

NAME
rmf - remove folder (only available within the message handling system, mh) SYNOPSIS
rmf [+folder] [-help] [-[no]interactive] OPTIONS
Prints a list of the valid options to this command. Asks for confirmation before deleting a folder. By default, rmf deletes a folder and its messages without asking for confirmation. If you specify the -interactive option, rmf asks if you are sure before deleting the folder. You are advised to use this option, since when rmf deletes a folder its contents are lost irretrievably. DESCRIPTION
The rmf command removes all of the messages within the current folder, and then removes the folder itself. If there are any files within the folder which are not part of MH, they are not removed, and an error message is displayed. You can specify a folder other than the current folder by using the +folder argument. If you do not specify a folder, and rmf cannot find the current folder,rmf asks you whether you want to delete +inbox instead. If the current folder is removed, it makes +inbox current. Note that the rmf command irreversibly deletes messages that do not have other links, so use it with caution. If the folder being removed is a sub-folder, the parent folder becomes the new current folder, and rmf tells you that 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. Using rmf to delete a read-only folder deletes the private sequence and current message information from the file, without affecting the folder itself. If you have sub-folders within a folder, you must delete all the sub-folders before you can delete the folder itself. PROFILE COMPONENTS
Path: To determine the user's Mail directory EXAMPLES
This example shows how rmf asks for confirmation when the -interactive option is used: % rmf -interactive +test Remove folder "test"? y FILES
The user profile. SEE ALSO
rmm(1) rmf(1)
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