SED- Insert text at top of file Post: 23946

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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

07-02-2002

Administrator Emeritus

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.

Perderabo

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LEARN ABOUT OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)

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