Converting a little Bash script to WAT as an exercise

People,

I want to convert the little Bash script hereunder to WAT as an actuall useful exercise for me to getting started with WASM - the script simply counts the number of emails in a Maildir tree that are less than x minutes old and prints the numbers out for each of the dirs.

I presume I will need WASI for this exercise - pointers to any similar exercises would be helpful . .

Thanks,

Phil.

#!/bin/sh

# $1  host
# $2  minutes
# $3  x - extra flag to do all dirs


function proc_dir()
{
	if [ "$3" == "count" ]; then		# Show counts of mails of all dirs within minutes
		count=`find $1 -name "1*," -mmin -$2 | wc -l`

		if [ "$count" != "0" ]; then
			echo -n "$1: " | sed 's/^.*Maildir\/\.//'
			echo $count
		else	
			continue
		fi
	else								# Shows Subjects of main dirs
		emails=`find $1/new $1/cur -name "1*," -mmin -$2 | sort -r`

		if [ "$emails" != "" ]; then
			for email in $emails
			do
				base=`echo $dir | sed 's/^.*\/\.//'`
				echo -n "${base}: "
				grep "^Subject: " $email | head -1 | sed 's/^Subject: //' | decode_utf8.pl
			done
		fi
	fi
}

if [ $1 == "localhost" ]; then
	maildir=$HOME/Maildir
else
	sshfs $1:/home/phr/Maildir /home/phr/md
	maildir=$HOME/md
fi

# echo $maildir

maindirs="
0_caa
0_caa_list
0_cryo
0_cryo_ssa-sc
0_naf
1_qps
1_qps_3-5_saje_crt"

if (( $# > 2 )); then					# Do counts
#	dirs=`cd $maildir ; find . -exec basename {} \; -regextype grep -regex "^\.[0-9a-z][^.]+$ | sort" 
	dirs=`cd $maildir ; ls -1a | grep -E "^\.[0-9a-z][^.]+$"`

	for dir in $dirs
	do
		proc_dir $maildir/$dir $2 count
	done
else									# Get maindirs Subjects
	proc_dir $maildir $2

	for dir in $maindirs
	do
		proc_dir $maildir/.$dir $2
	done
fi

sleep 5

if [ $1 != "localhost" ]; then
	fusermount -u /home/phr/md
fi

The issue names only a Bash script and a desired WAT/WASI exercise; no repository file, test, or entry point is identified. First clarify whether the intended outcome is a code example, documentation, or general guidance, then define acceptance criteria for the Maildir traversal and output before implementation can begin.