Hello,

I have an external file (file.txt). This shall be a kind of a config file for my shell script. I get the line numbers as to a corresponding entry by grep. Now I would like to substitute the corresponding line from the shell script back to the file and exactly on the same line number.

e.g. if line number 20 is the place in file.txt where the name of the project is stored. And the user can change the name of his project via a kdialog template, this changes shall be overwrite in the file.txt, line 20.

tks for any reply

Do you mean that you want a history of changes in the script to be shown (somehow) in file.txt

An actual example of what you mean would help a lot.

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

Found a SED solution which looks:

# getCounter
var="# <Path to Project>"
var1="/root/Desktop/Textdatei.txt"
Counter=`sed -n -e "/${var}/=" $var1`
FinalCounter=`expr $Counter + 1`

# lineSubstitution
varneu="/tmp/noch/watdazu/gesch/"
sed -e "${FinalCounter}c\\${varneu}" $var1 > xxx.txt # Problem: described below
cat xxx.txt > $var1 # Bad solution
rm xxx.txt

The remaining problem is that I wished to write the whole samplestorage back to the original file:

1st solution: sed -e "${FinalCounter}c\\${varneu}" $var1 > $var1
2nd solution sed -e "${FinalCounter}c\\${varneu}w $var1" $var1

in solution no. 1 the file (Textdatei.txt) is always empty. I do not understand for what reason the file will be overwritten with empty lines?

in solution no 2. I have the problem with the syntax. the w $var1 is always just added to the $varneu in the substituted line. I tried with several charcters before w like (/, \, etc. ) but I did'nt hit the right one.

Can anybody advice how to go along with this?

tks in advance

Found a SED solution which looks:

# getCounter
var="# <Path to Project>"
var1="/root/Desktop/Textdatei.txt"
Counter=`sed -n -e "/${var}/=" $var1`
FinalCounter=`expr $Counter + 1`

# lineSubstitution
varneu="/tmp/noch/watdazu/gesch/"
sed -e "${FinalCounter}c\\${varneu}" $var1 > xxx.txt # Problem: described below
cat xxx.txt > $var1 # Bad solution
rm xxx.txt

The remaining problem is that I wished to write the whole samplestorage back to the original file:

1st solution: sed -e "${FinalCounter}c\\${varneu}" $var1 > $var1
2nd solution sed -e "${FinalCounter}c\\${varneu}w $var1" $var1

in solution no. 1 the file (Textdatei.txt) is always empty. I do not understand for what reason the file will be overwritten with empty lines?

in solution no 2. I have the problem with the syntax. the w $var1 is always just added to the $varneu in the substituted line. I tried with several charcters before w like (/, \, etc. ) but I did'nt hit the right one.

Can you advice how to go along with this?

tks in advance

p.s. this is my Textdatei.txt:

#############################################
#***************Use this File **************#
#############################################
#
#

# <ProjectName>
AlterName

#
#
#
# <Path to Project>
/tmp/noch/watdazu/gesch/

#
#
#

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