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Full Discussion: question about append columns
Top Forums Shell Programming and Scripting question about append columns Post 302471870 by Chubler_XL on Monday 15th of November 2010 12:23:18 PM
Old 11-15-2010
You weren't very clear on what the output should be like (I'm assuming you want a + seperator in the output too)

Code:
prev=
for f in f1 f2 f3 g1 h1 t2
do
    if [ -z "$prev" ]
    then
        cut -d+ -f2 $f > $f.nums 
    else
        cut -d+ -f2 $f | paste -d+ $prev - > $f.nums
    fi  
    prev=$f.nums
done

---------- Post updated at 03:23 AM ---------- Previous update was at 03:12 AM ----------

Here is another solution that's shorter, but probably harder to follow:

Code:
PASTECMD="cat -"
for f in f1 f2 f3 g1 h1 t2
do
    cut -d+ -f2 $f | $PASTECMD > $f.nums
    PASTECMD="paste -d+ $f.nums -"
done

PASTCMD on first loop is cat of standard input (simple copy stdin to stdout). It is then changed for 2nd (and subsiquent) loops to paste stdin to the previous file.
 

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LEARN ABOUT V7

prev

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

NAME

       prev - show the previous message

SYNOPSIS

       prev [+folder] [-showproc program] [-showmimeproc program] [-header | -noheader] [-checkmime | -nocheckmime] [switches for showproc or
	    showmimeproc] [-version] [-help]

DESCRIPTION

       Prev performs a show on the previous message in the specified (or current) folder.  Like show, it passes any switches  on  to  the  program
       named by showproc or showmimeproc, which is called to list the message.	This command is almost exactly equivalent to "show prev".  Consult
       the manual entry for show(1) for all the details.

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
       showproc:	    Program to show non-MIME messages
       showmimeproc:	    Program to show MIME messages

SEE ALSO

       show(1), next(1)

DEFAULTS

       `+folder' defaults to the current folder
       `-checkmime'
       `-header'

CONTEXT

       If a folder is specified, it will become the current folder.  The message that is shown (i.e.,  the  previous  message  in  sequence)  will
       become the current message.

BUGS

       prev  is  really  a link to the show program.  As a result, if you make a link to prev and that link is not called prev, your link will act
       like show instead.  To circumvent this, add a profile-entry for the link to your nmh profile and add the argument prev to the entry.

MH.6.8								   11 June 2012 							   PREV(1)
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