#! /bin/sh

# fd = name from stdio.h
#  0 = stdin
#  1 = stdout
#  2 = stderr
#
# 1>&2      redirects stdout to stderr
# > file    redirects stdout to file, same as 1> file
# 2> file   redirects stderr to file
# cmd1|cmd2 pipe cmd1 stdout to cmd2 stdin
# |&        pipe stdout and stderr

if [ "$#" -eq "2" ]; then
 N="$1"
 FILE="$2"
else
 echo "Usage: $0 N FILE" 1>&2
 exit 1
fi

echo "N = $N, FILE = $FILE"

# sample runs:
# $ bash args.sh a bb cc
# Usage: args.sh N FILE
# $ bash args.sh a bb
# N = a, FILE = bb
# $