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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 302793061 by MadeInGermany on Thursday 11th of April 2013 03:47:55 PM
Old 04-11-2013
Assumed your filename is "file".
With sed:
Code:
factor="3,6"
trial="YES,18,1.635"
sed '/'"$factor"'|/ s/$/|'"$trial"'/' < file > file.new

With the shell built-ins it becomes a bit long,
so a function makes sense:
Code:
append () {
IFS="|"   
while read factor trial
do
  if [ "$factor" = "$1" ] 
  then
    echo "$factor|$trial|$2"
  else
    echo "$factor|$trial"
  fi
done < file > file.new
}

and call it
Code:
append "3,6" "YES,18,1.635"

---------- Post updated at 02:47 PM ---------- Previous update was at 02:38 PM ----------

The sed version has the problem that it does not have a true field separator.
Here is an awk version:
Code:
awk -F"|" '{if ($1==factor) {print $0 FS trial} else {print}}' factor="3,6" trial="YES,18,1.635" < file > file.new

This User Gave Thanks to MadeInGermany For This Post:
treesloth
 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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