¿Cómo aplicar un bash script sólo a una cuenta de usuario?

Tengo entendido que envías un script a tus sistemas remotos. Luego ejecutas el script. No estoy seguro de bajo qué id de usuario se ejecutará el script. No sé qué quieres hacer para ese usuario.

Podrías poner el siguiente código de cabecera en un script. Averigua si el usuario es un usuario administrador o un usuario no administrador.

Hay muchas maneras de comprobar la administración. Nota: Algunos de los métodos mostrados no funcionan. Ver:

https://superuser.com/questions/279891/list-all-members-of-a-group-mac-os-x

Este bash script lista todos los miembros del grupo admin.

group=admin;
for i in $(dscl . list /users);
  do [[ $(id -nG $i | grep $group) ]] && echo $i;
done;rc=0 

Destilándolo todo.

#!/bin/bash
# ideas from:
# https://www.symantec.com/connect/articles/mac-commands-directory-editor-dscl-and-custom-inventory
# https://superuser.com/questions/279891/list-all-members-of-a-group-mac-os-x
#
# Please note this is prototype.
#
#       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  
#       IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  
#       FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE  
#       AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER  
#       LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,  
#       OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE  
#       SOFTWARE.

group=admin;
for i in $(dscl . list /users);
  do
    echo "process user ${i}"
    uniqueID=$(dscl  /Local/Default -read /Users/${i} UniqueID | awk '{ print $2 }')

    # exclude system-created users, which have IDs below 500
    if [ "${uniqueID:-0}" -ge 500 ]; then
      if  [[ $(id -nG $i | grep $group) ]]; then 
        #echo "${i} is a member of ${group}"
        #-- plan english
        echo "${i} is an admin user."
      else
        echo
        #echo "${i} isn't a member of ${group}"
        #-- plan english
        echo "${i} is a regular user..."
        # print the user's home folder
        homeDirectory=$(dscl  /Local/Default -read /Users/${i} NFSHomeDirectory | awk '{ print $2 }')
        echo "Home directory is ${homeDirectory}"
        echo
     fi
    fi
done
# leave a good impression on the caller
rc=0

encontrar si el usuario actual es un administrador

  echo "Current user is " ${USER}
    if [[ $(id -nG ${USER} | grep "admin" ) ]]; then
      echo "admin user"
    else
      echo "regular user"
    fi