This repository contains
sor, two utility programs that
walk recursively walks the directories
specified on the command line (or the current directory, if none is specified),
printing each file path.
sor (“shell or”) reads file paths from standard
input; for each path, it evaluates its arguments as Bash snippets, passing the
path as an argument to each and printing the path if any snippet exits with
status 0. For example, instead of saying
find . -type f -name \*foo\*
you can say
walk | grep foo | sor 'test -f'
If your filenames might contain newlines, you can say
walk -0 | grep -z foo | sor -0 'test -f'
By avoiding syscalls,
walk achieves substantially better performance than
find. A microbenchmark –
$ time find /usr >/dev/null real 0m3.542s user 0m0.880s sys 0m2.646s $ time walk /usr >/dev/null real 0m2.311s user 0m0.370s sys 0m1.926s
walk executing nearly 40% faster on a local file system with a hot
cache. Performance on network file systems should be even better. On the other
find implements its predicates in-process, making them orders of
magnitude faster than
$ time find /usr -type f >/dev/null real 0m3.464s user 0m0.831s sys 0m2.615s $ time walk /usr | sor 'test -f' >/dev/null real 7m40.127s user 1m47.818s sys 2m48.595s
This is not an official Google product.