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Full Discussion: Bash - Appending to specific line in file
Top Forums Shell Programming and Scripting Bash - Appending to specific line in file Post 302798037 by Don Cragun on Tuesday 23rd of April 2013 04:36:16 PM
Old 04-23-2013
I apologize. In my last posting, the awk program I supplied was missing a closing brace. I should have pasted it in the form I used when I tested it instead of converting it back to a 1-liner. Try the following awk script (but use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of awk if you're using a Solaris/SunOS system):
Code:
awk -F"|" '
{       if($1==factor) {
                print $0 FS trial
                found=1
        } else print
}
END{    if(! found) print factor FS trial
}' factor="3,6" trial="YES,18,1.635" < file > file.new

And, no. Changing the field separator from "|" to ":" will not make any real difference. This script will add new trial results to the line in file that has the given factors (or add a new line if the given factors are not already in file); not replace existing trial results. It will never replace existing trial information when adding a new trial. You just need to move or copy file.new to file after each trial is successfully added.
 

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LEARN ABOUT DEBIAN

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service	runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current
       working directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script.  service passes COMMAND and OPTIONS to the init script unmodified.  All scripts should support at least the start and stop
       commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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