#!/bin/sed -f

# reverse_characters_debug.sed
#
# A version which prints what it's doing to help understand the process

/../! b

# Reverse a line.  Begin embedding the line between two newlines
s/^.*$/\n&\n/

# List the line to see what the command above did to it
l

# Move first character at the end.  The regexp matches until
# there are zero or one characters between the markers
tx
:x
s/\(\n.\)\(.*\)\(.\n\)/\3\2\1/
# List the result of each loop iteration
l
tx

# Remove the newline markers
s/\n//g