Можно воспользоватся регулярными выражениями , благо линукс это тебе не винда
sed \'s#\\(,\\)\\([^.,]\\+\\.\\(jpg\\|png\\|gif\\)\\)#\\1+\\2#g\' infile
Explanation:
s#...#...#g # Substitute command. \'#\' is separator and \'g\' is to apply it many times for
# each line.
\\(,\\) # Match a comma, and save it as \'\\1\'
[^.,]\\+\\. # Match any characters until a \'.\' or \',\' found.
\\(jpg\\|png\\|gif\\) # Match extension.
\\1+\\2 # Replace with: Comma, plus sign and the image name.
Если не регулярка, то
Sed has several commands, but most people only learn the substitute command: s. The substitute command changes all occurrences of the regular expression into a new value. A simple example is changing \"day\" in the \"old\" file to \"night\" in the \"new\" file:
sed s/day/night/ new
Нашел на одном из форумов
I had a 12GB file to edit today. The vim LargeFile plugin did not work for me. It still used up all my memory and then printed an error message :-(. I could not use hexedit for either, as it cannot insert anything, just overwrite. Here is an alternative approach:
You split the file, edit the parts and then recombine it. You still need twice the disk space though.
Grep for something surrounding the line you would like to edit:
grep -n \'something\' HUGEFILE | head -n 1
Extract that range of the file:
sed -n -e \'4,5p\' -e \'5q\' HUGEFILE > SMALLPART
The -n option is required to suppress the default behaviour of sed to print everything
4,5p prints lines 4 and 5
5q aborts sed after processing line 5
Edit SMALLPART using your favourite editor.
Combine the file:
(head -n 3 HUGEFILE; cat SMALLPART; sed -e \'1,5d\' HUGEFILE) > HUGEFILE.new
HUGEFILE.new will now be your edited file, you can delete the original HUGEFILE.