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Full Discussion: sed substitute situation
Top Forums UNIX for Dummies Questions & Answers sed substitute situation Post 73677 by vgersh99 on Friday 3rd of June 2005 08:46:40 AM
Old 06-03-2005
Quote:
Originally Posted by newbreed1
I am having a problem executing a sed substitute in a file. I have tried alot of different things I found in previous posts, however non seem to work.
I want to substitute this in $FILE:
VALUE=33.4 for VALUE=44.0

In the script I have tried the following:
prev=$(awk -F"=" '{ print $2 }' $FILE )
new=$(echo "scale=1; 3.4 * 10" | bc )

sed 's/$prev/$new/g' $FILE > NEW_FILE
sed 's/"$prev"/"$new"/g' $FILE > NEW_FILE
sed "s/$prev/$new/g" $FILE > NEW_FILE
sed "s/"$prev"/"$new"/g" $FILE > NEW_FILE
sed s/"$prev"/"$new"/g $FILE > NEW_FILE
sed s/$prev/$new/g $FILE > NEW_FILE

In each one of these sed says s/ is garbled or it does not do the substitue. Can anyone see something I am missing? Thanks alot.

#3 should've worked.
post a couple of sample lines from $FILE [the ones with $prev], pls!
 

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LEARN ABOUT REDHAT

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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