write_opt!("-I","--delim ifs"=>"Read the first byte of the IFS environment variable as the I/O line seperator.")?;
write_opt!("--delim <byte>"=>"Use this user-provided byte as the I/O line seperator")?;
write_opt!("-a","--atime"=>"Sort by atime")?;
write_opt!("-c","--ctime"=>"Sort by ctime (default)")?;
write_opt!("-c","--ctime"=>"Sort by ctime")?;
write_opt!("-m","--mtime"=>"Sort by mtime")?;
write_opt!("-b","--btime"=>"Sort by birth (default)")?;
write_opt!("-n","--reverse"=>"Print output in reverse")?;
write_opt!("-p","--parallel cpus|<max tasks>"=>"Run tasks in parallel, with a max number of tasks being equal `<max tasks>`, or, if 0, to infinity (see `-P`), if 'cpus', to the number of logical CPU cores ({}, default)",*walk::NUM_CPUS)?;
write_opt!("-P","--parallel 0"=>"Run tasks with unbounded parallelism, no limit to the number of walker tasks running at once (note: the physical thread pool will always be the same size regardless of these flags)")?;