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append to fle using sed

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# 1  
Old 06-12-2007
append to fle using sed
Hello ,

I have the folloiwing command :
sed -n "$var,$final w $destfile" $sourcefile

where :
$var - $final represent the range of line numbers to be written in $destfile

However I require this command to work in a loop for which i need the sed command to keep appending the output to the $destfile .

Any Help ??
Thanks in advance ,
SD
# 2  
Old 06-12-2007
SD,
"sed" overwrites the file in the "w" option every time it runs.
If you want to continue appending to the file, you can try
this alternate "sed" solution:
Code:
rm -f ${sourcefile}
...
sed -n "${var},${final}p" >> ${sourcefile}

# 3  
Old 06-13-2007
Quote:
Originally Posted by shweta_d
Hello ,

I have the folloiwing command :
sed -n "$var,$final w $destfile" $sourcefile

where :
$var - $final represent the range of line numbers to be written in $destfile

However I require this command to work in a loop for which i need the sed command to keep appending the output to the $destfile .

Code:
sed -n "$var,$final p" "$sourcefile" >> "$destfile"

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