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Special Forums UNIX Desktop Questions & Answers shell overwrite lines in a file Post 302251823 by ACTGADE on Tuesday 28th of October 2008 07:45:49 AM
Old 10-28-2008
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
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for lines containing a given pattern SYNOPSIS
grep [-elnsv] pattern [file] ... OPTIONS
-e -e pattern is the same as pattern -c Print a count of lines matched -i Ignore case -l Print file names, no lines -n Print line numbers -s Status only, no printed output -v Select lines that do not match EXAMPLES
grep mouse file # Find lines in file containing mouse grep [0-9] file # Print lines containing a digit DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1 occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is returned. SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9). GREP(1)
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