grep -r does a recursive search in all files in a particular directory. However, if I want these files to be read by grep in the order of their last modified time, how do I do that?
grep -- foo **/*(D.om)
With GNU tools:
find . -type f -printf '%T@\t%p\0' | tr '\n\0' '\0\n' | sort -rg | cut -f2- | tr '\n\0' '\0\n' | xargs -r0 grep foo
If you don't have something like
zsh, this isn't entirely trivial. It's probably more efficient to get the hits, then sort by the modification time of each file with a hit.
grep -rl 'regex' . | while read -r file; do stat -c '%Y:%n' "$file" done | sort | cut -d: -f2-
This will obviously break if you have file names with newlines on their names or something.