Gfilui

Suppose I want to cut more than one interval of lines from one file (eg., lines 1-500, 1029-1729 and 2696-3446), appending values at the end of another file (output.txt) and eliminating these values from the first file. The origin is a file with 9277 lines, I want to cut some of them, eliminating them from the original file and pasting them into another file. Is that possible via command line?

Using sed, you can write a set of lines to a different file while deleting it from the current file like so:

sed -i -e 'N, M w output.txt
d ' input.txt

where N and M are the line numbers. The -i option makes sed save changes to the source file, and here the d command deletes to those lines. At the same time, w output.txt causes the selected lines to be written to output.txt. And yes, those are two separate lines: sed requires that the w command's filename be till a newline.

So you can do something like:

cmd=' w output.txt
d '
sed -i -e "1,500 $cmd" -e "1029,1729 $cmd" -e "2696,3446 $cmd" input.txt

possible !

1. copy lines to dest.file with redirected outout of grep 'pattern' src.file >> dest.file




2. delete lines from src.file with sed -i '/pattern/d' src.file