Why don't you use /loadbuf|/savebuf there instead of /filter?
Personall prefrence is my only cause I used filter once, it worked I never used the other one, that and sometimes i want the files sorted if the line order makes no difference so ill add a "-t c s" on the way in or out depending on the need at the time.
I dont know if the reported (here) problems with load/savebuf are there or not, as i never used it.
I also just dont like reading files, I have had some wierd things happening when a file has by chance a number on the first line (due to it defualting to representing the number of lines in the file) and its not that its just the data of the file.
From memory it was something like i would do a "$read(file.txt,tw,*whatever*)" then a "write -il $+ $calc($readln + 1) file.txt This Line Inserted After One Matched" and if that $readln was the last line of the file I would find the line inserted before the last line instead of after it. (dont quote me on thats what it is exactly, but it was some abnormal thing)
