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Full Discussion: shell overwrite lines in a file
Special Forums UNIX Desktop Questions & Answers shell overwrite lines in a file Post 302251597 by ACTGADE on Monday 27th of October 2008 01:26:37 PM
Old 10-27-2008
Tks for your replay. Here is the explanantion:

I am writing a script to install a embedded mini-linux via gentoo. The script is communicating with the user via kdialog.
I would have two chances - 1st. fix all parameter (e.g. projectname, path to project, selected libs (uclibc, glibs etc.) etc.) or 2nd. put all those parameter in a separate file.
This file is my config file file.txt it looks like this:

#### REM
#
#

# <1> Projectname
ProjectOne

#REM
# <2> Path to Project
/mnt/ProjectOne

# ....

So once I need a parameter e.g. the projectname the script can read it from the config file file.txt by find the contant starting with <...> add one line and read the result into a var.

But the user shall be able to change the parameters as well. E.g. he can offer a kdialog to define the project path. If this differ from the default, I would like to overwrite the choice e.g. /tmp/myproject/new in the config file by searching the # <2> ... constant add one line and overwrite the actual value.

My problem is that I do not know a tool in shell which is able to write into files as to a line order. SED maybe can but I do not have any experience with it.

Tks for your reply in advance
 

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LEARN ABOUT OSF1

projects

projects(1)							   User Commands						       projects(1)

NAME

       projects - print project membership of user

SYNOPSIS

       projects [-dv] [ user]

       projects -l [projectname  [projectname...]]

DESCRIPTION

       The  projects  command prints on standard output the projects to which the invoking user or an optionally specified user belongs. Each user
       belongs to some set of projects specified in the project(4) file and possibly in the associated NIS maps and  LDAP  databases  for  project
       information.

OPTIONS

       The following options are supported:

       -d	Prints only default project.

       -l	Prints verbose info on each project projectname. If no projectnames are given, info on all projects is printed.

       -v	Prints project descriptions along with project names.

OPERANDS

       The following operand is supported:

       projectnaDisplay information for the specified project.

       user	Displays project memberships for the specified user.

EXAMPLES

       Example 1: Displaying Membership for a Specified User

       example$ projects paul
       default beatles wings
       example$ projects ringo
       default beatles
       example$ projects -d paul
       beatles

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       1	A fatal error occurred during execution.

       2	Invalid command line options were specified.

FILES

       /etc/project    Local database containing valid project definitions for this machine.

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Stability		     |See below.		   |
       +-----------------------------+-----------------------------+

       The invocation is Evolving. The human-readable output is Unstable.

SEE ALSO

       getdefaultproj(3PROJECT), getprojent(3PROJECT), project(4), attributes(5)

SunOS 5.10							    13 May 2004 						       projects(1)
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