Re: cron

["Bill C Riemers" <docbill@freeshell.org>]

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Coronna,

That is exactly what I did when I realized the UID trick doesn't work under cygwin.  In fact I wrote myself a short script
as "/usr/local/bin/su" to use in place of "/usr/bin/su".   Like most scripts I write I found I really don't use it.  I just
keep it around incase something I download includes a script or a Makefile that requires a working version of su.

                                                             Bill



> That's way easier:
>
> Add a home dir and a useful shell to SYSTEM's /etc/passwd entry:
>
>   SYSTEM:*:18:544:,S-1-5-18:/home/system:/bin/bash
>
> Then:  Install sshd as service, create a private/public key pair, put
> the public key into /home/system/.ssh/authorized_keys and login to your
> system using `ssh -l system localhost'.
>
>
> Or:  Install inetd as service, remove the `*' from SYSTEM's password
> field and login to localhost using rlogin or telnet.
>
> Corinna
>
> -
>

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#!/usr/bin/bash
# assign the environment to a
a=`env |sed -n -e '/^!::=/d' -e 's,$,_EOL_,g' -e 's,'\'',_APOS_,g' -e 's/\([A-Za-z0-9_][A-Za-z0-9_]*\)=/'\'';\1='\''/' -e '/./p'`

rm -f /tmp/env.$$
echo "#!`which bash`" > /tmp/env.$$
chmod 755 /tmp/env.$$

userarg="Administrator"

options=":lc:fmps:"
repeat=1;
while [ $repeat -ne 0 ] ; do
  getopts $options arg
  if [ $? -ne 0 ] ; then
    arg="$1"
    OPTIND=2
  fi
  case "x$arg" in 
    xl | x- | x--login)
      loginarg=1
      if [ -z "$shellarg" ] ; then
        shellarg=`which bash`
      fi
      ;;
    xc | x--command | x--command)
      commandarg="$OPTARG"
      ;;
    x--command=*)
      commandarg="${arg##--command=}"
      ;;
    xf | x--fast )
      fastarg=1
      if [ -z "$shellarg" ] ; then
        shellarg=`which tcsh`
      fi
      if [ -z "$shellarg" ] ; then
        shellarg=`which csh`
      fi
      ;;
    xm | xp | x--preserve-environment)
      echo $a|sed -e 's,^'\'';,,' -e 's,_EOL_$,'\'',' -e 's,_EOL_ '\'';,'\'';\
,g' -e "s,_APOS_,'\\'',g" -e 's,_EOL_ ,\
,g' >> /tmp/env.$$
      env|sed -n -e 's,\([A-Za-z0-9_][A-Za-z0-9_]*\)=.*,export \1;,p' >> /tmp/env.$$
      preservearg=1
      ;;
    xs )
      shellarg="$OPTARG"
      ;;
    x--shell)
      shellarg="$OPTARG"
      OPTIND=3
      ;;
    x--shell=*)
      shellarg="${arg##--shell=}"
      ;;
    *)
      repeat=0
      OPTIND=1
      ;;
  esac
  while [ $OPTIND -gt 1 ] ; do
    shift
    OPTIND=`expr $OPTIND - 1`
  done
done
if [ -n "$1" ] ; then
  userarg="$1"
  shift
fi
if [ -z "$shellarg" ] ; then
  shellarg=`which bash`
fi
if [ -n "$commandarg" ] ; then
  echo "exec \"$shellarg\" $fastarg $loginarg -c \"$commandarg\"" >>/tmp/env.$$
elif [ -n "$*" ] ; then
  echo "exec \"$shellarg\" $fastarg $loginarg -c \"$@\"" >>/tmp/env.$$
else
  echo "exec \"$shellarg\" $fastarg $loginarg -i -s" >>/tmp/env.$$
fi
trap "rm -f /tmp/env.$$" EXIT
ssh -l "$userarg" localhost /tmp/env.$$
exit $?

SU(1)                            User Commands                           SU(1)



NAME
       su - run a shell with substitute user and group IDs

SYNOPSIS
       su [OPTION]... [-] [USER [ARG]...]

DESCRIPTION
       Change the effective user id and group id to that of USER.

       -, -l, --login
              make the shell a login shell

       -c, --commmand=COMMAND
              pass a single COMMAND to the shell with -c

       -f, --fast
              pass -f to the shell (for csh or tcsh)

       -m, --preserve-environment
              do not reset environment variables

       -p     same as -m

       -s, --shell=SHELL
              run SHELL if /etc/shells allows it

       --help display this help and exit

       --version
              output version information and exit

       A mere - implies -l.   If USER not given, assume root.

AUTHOR
       Written by David MacKenzie.

REPORTING BUGS
       Report bugs to <bug-sh-utils@gnu.org>.

COPYRIGHT
       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR  A  PARTICULAR
       PURPOSE.

SEE ALSO
       The  full  documentation  for su is maintained as a Texinfo manual.  If
       the info and su programs are properly installed at your site, the  com-
       mand

              info su

       should give you access to the complete manual.



su (sh-utils) 2.0.15              August 2002                            SU(1)


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