rdiff

#!/bin/csh -f
# rdiff (csh script) -- compares a file with its equivalent on a given host
# Usage: rdiff [-e [-1]] <file> [ <user>@<host> ]

while (x$1 =~ x-*)
  if (x$1 == x-e) set option_e
  if (x$1 == x-1) set option_1
  shift
end

set remote_sh = rsh
if ($?option_e) then
  set remote_sh = ssh`if ($?option_1) echo 1`
endif

if ($#argv == 0) then
  sh -c "echo ${0}: 'a file (and optionally a user-identifier) must be specified'"
    set exit_code = 1
  else
    if ($#argv == 1) then
      if (! $?REMOTEHOST) then
        sh -c "echo ${0}: '<REMOTEHOST> is not set' >&2"
        set exit_code = 2
      else
        set address = "$REMOTEHOST -l $REMOTEUSER"
      endif
    else
      set address = "`echo $2 | sed -e 's/\(.*\)@\(.*\)/\2 -l \1/'`"
    endif
    if (! $?exit_code) then
      $remote_sh $address cat $1 | diff -c - $1
    endif
  endif
endif

if ($?exit_code) then
  exit $exit_code
endif