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Full Discussion: SED- Insert text at top of file
Top Forums Shell Programming and Scripting SED- Insert text at top of file Post 23946 by Perderabo on Tuesday 2nd of July 2002 08:04:52 PM
Old 07-02-2002
The trouble with posting a complete solution is that I don't exactly understand the problem completely. But here goes:
Code:
#! /usr/bin/ksh
FILENAME=input_file
NEWFILENAME=output_file
sed -e "\$a\\
PR_DbConfigEnd ${FILENAME}" <  $FILENAME > $NEWFILENAME
exit 0

I can only hope that there is some good reason for the filename to be appear inside the quotes. This will cause it to be part of the data inserted into the file. That really looks like a bug to me. If so, just delete that part. But for better or worse, I am copying from the other examples in this thread.

As for how it works, we need sed to see a line like:
$a\
but when we use double quotes, ksh processes $a as if it were a variable. But inside double quotes, a backslash removes any special power the next character has, so the \$a becomes just $a and ksh moves on. To actually get a backslash, we need \\. The first backslash is eaten by ksh as it processes the literal and this makes it leave the next backslash alone.

And bash works the same way.
 

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LEARN ABOUT PHP

times

times(1)                                                           User Commands                                                          times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           times(1)
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