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Top Forums Shell Programming and Scripting Assign command (with pipe) output to a variable Post 302372597 by cfajohnson on Wednesday 18th of November 2009 10:05:36 AM
Old 11-18-2009
Quote:
Originally Posted by jeff_cen
Hi ,

I would like to assign command (with pipe) output to a variable. The code is as follows. The goal of the code is to get the last folder folder with a particular name pattern.

myDate=`ls | grep 2009 | tail -1`
echo "myDate=" $myDate

However, in the presence of the pipe, the code doesn't work.

What does "doesn't work" mean?
What does happen?


You don't need ls or grep or tail:

Code:
set -- *2009*
shift $(( $# - 1 ))
myDate=$1

 

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packf(1mh)																packf(1mh)

Name
       packf - compress a folder into a single file

Syntax
       packf [ +folder ] [ msgs ] [ -file name ] [ -help ]

Description
       Each  message in a folder is normally stored as a separate file.  The command takes all messages from the current folder and copies them to
       a single specified file.  Each message in the file is separated by four <CTRL/A>s and a newline.

       You can specify a folder other than the current folder by using the +folder argument.  If you do not want all the messages in a	folder	to
       be packed into one file, you can specify a number of messages or a range of messages with message numbers.

       The first message packed will become the current message.  If you specify a +folder argument, that folder will become the current folder.

       When messages have been packed into a file using you can separate them into individual messages using the command.  See

Options
       -file name
		 Specifies  the  file  in which you want the message(s) to be stored.  If you specify an existing file then the specified messages
		 will be appended to the end of that file.  Otherwise, a new file will be created and the messages placed in it.  If  you  do  not
		 specify  a  filename,	attempts  to  place the messages in a file called in the current working directory.  If this file does not
		 exist, asks whether you want to create it.

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

       The default settings for this command are:

	      +folder defaults to the current folder
	      msgs defaults to all
	      -file ./msgbox

Examples
       The first example shows all the messages in the folder being packed into a file called
       % packf +lrp -file planning

       The next example shows how prompts you if you do not specify a -file option.  A file called is created by in your home directory, and  mes-
       sages 3 to 5 are packed into it:
       % packf +lrp 3-5
       Create file "/machine/disk/username/msgbox"? y

Profile Components
       Path:	      To determine the user's Mail directory
       Msg-Protect:   To set protections when creating a new file

Files
       $HOME/.mh_profile   The user profile.

See Also
       burst(1mh)

																	packf(1mh)
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