Hello, I know I could do this with bash, awk, and probably several other languages, I wanted to use m4.
I was trying to do a basic "If the file is there then include it," directive with m4. echo 'define(`mkv'\'', `ogg'\'')ifelse(`1'\'', syscmd(`test -f f'\'')sysval, `-i'\'' f `-map 1'\'')dnl' | m4 -D f="$i" - I expected m4 to check if the file exists, with test. Then, m4 would output the expansion "-i FILENAME -map 1" if the file exists, and output nothing, "", if the file does not exist. As a bit of a bonus question, can I somehow tack a period onto the front of the mkv macro expansion? That way, instead of matching "mkv", it would match ".mkv". Thanks, David
