assigning a multiline grep output which has been piped through sed to a shell variabl Post: 302303158

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Top Forums Shell Programming and Scripting assigning a multiline grep output which has been piped through sed to a shell variabl Post 302303158 by timculhane on Thursday 2nd of April 2009 03:04:20 AM

04-02-2009

Registered User

Hi,

Ok, what I have is an installation script for an application. If this script detects an existing installation of the application it attempts an upgrade. This involves:

1. backing up the existing installation directory.
2. installing a fresh installation.
3. extracting specific lines from a configuration file in the backuped directory and inserting them, at a specific point, in the freshly installed config file.

So, I need to search for the line or lines in the old config file. This may return several lines of config. These lines must then be inserted in the new config file at a specific text marker, such as something like:

#@@Merge_config_here@@#

so, in my script I need to hold the extracted text in a variable and insert it in the new config file. The marker text also needs to be removed, so actually it is a replace.

Now, from what I've read, sed does not allow literal newline characters in a replacement pattern. If they exist then they must be escaped with a backslash. This is why I want to add a backslash to the end of each line I extract from the old config file.

However, whatever I'm doing, sed still doesn't like what it is getting.

I hope this clarifies things?

Tim

timculhane

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LEARN ABOUT REDHAT

uuid-config

UUID-CONFIG(1)						   Universally Unique Identifier					    UUID-CONFIG(1)

NAME

       uuid-config - OSSP uuid API build utility

VERSION

       OSSP uuid 1.6.2 (04-Jul-2008)

SYNOPSIS

       uuid-config [--help] [--version] [--all] [--prefix] [--exec-prefix] [--bindir] [--libdir] [--includedir] [--mandir] [--datadir] [--acdir]
       [--cflags] [--ldflags] [--libs]

DESCRIPTION

       The uuid-config program is a little helper utility for easy configuring and building applications based on the uuid(3) library.	It can be
       used to query the C compiler and linker flags which are required to correctly compile and link the application against the uuid(3) library.

OPTIONS

       uuid-config accepts the following options:

       --help
	 Prints the short usage information.

       --version
	 Prints the version number and date of the installed uuid(3) library.

       --all
	 Forces the output of all flags, that is, including extra flags which are not OSSP uuid specific.

       --prefix
	 Prints the installation prefix of architecture independent files

       --exec-prefix
	 Prints the installation prefix of architecture dependent files.

       --bindir
	 Prints the installation directory of binaries.

       --libdir
	 Prints the installation directory of libraries.

       --includedir
	 Prints the installation directory of include headers.

       --mandir
	 Prints the installation directory of manual pages.

       --datadir
	 Prints the installation directory of shared data.

       --acdir
	 Prints the installation directory of autoconf data.

       --cflags
	 Prints the C compiler flags which are needed to compile the uuid(3)-based application. The output is usually added to the CFLAGS
	 uuidiable of the applications Makefile.

       --ldflags
	 Prints the linker flags (-L) which are needed to link the application with the uuid(3) library. The output is usually added to the
	 LDFLAGS uuidiable of the applications Makefile.

       --libs
	 Prints the library flags (-l) which are needed to link the application with the C uuid(3) library. The output is usually added to the
	 LIBS uuidiable of the applications Makefile.

EXAMPLE

	CC	= cc
	CFLAGS	= -O `uuid-config --cflags`
	LDFLAGS = `uuid-config --ldflags`
	LIBS	= -lm `uuid-config --libs`

	all: foo
	foo: foo.o
	    $(CC) $(LDFLAGS) -o foo foo.o $(LIBS)
	foo.o: foo.c
	    $(CC) $(CFLAGS) -c foo.c

SEE ALSO

       uuid(3), uuid(1), OSSP::uuid(3).

04-Jul-2008							  OSSP uuid 1.6.2						    UUID-CONFIG(1)

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