# SccsId[] = "%W% (USL function) %G%"
              CG_name="CHGRP_EXIT_ERR"
              if [ ".${SECONDS}" = "." ]; then # Bourne function already loaded?
                 [ ."`set|egrep '^$CG_name\(\)\{$'`" != . ] && CG_loaded=1
              else # Korn or Bash shell and function already loaded?
                 if [ `expr "\`uname -s\`" : "[Ll][Ii][Nn][Uu][Xx]"` -eq 0 ]; then
                    [ ."`typeset +f|awk '/^'$CG_name'[=\(]?/'`" != . ] && CG_loaded=1
                 else # Linux
                    [ ."`typeset -F|awk '/^'$CG_name'[=\(]?/'`" != . ] && CG_loaded=1
                 fi
              fi
              if [ 0${CG_loaded} -eq 0 ]; then
              #----------------------------------------------------------------------#
              CHGRP_EXIT_ERR() # Function documentation located at bottom.           #
              #----------------------------------------------------------------------#
              { [ ."${AWK}" = . ] && { { [ -x /usr/bin/nawk ] && AWK=/usr/bin/nawk; } \
                                  ||   { [ -x /bin/gawk     ] && AWK=/bin/gawk    ; } \
                                  ||   { [ -x /usr/bin/awk  ] && AWK=/usr/bin/awk ; }; }

                if [ .${SHLIB} = . ]; then SHLIB=/usr/local/scripts; export SHLIB; fi

                . $SHLIB/email_msg.sh # Calls $SHLIB/exit.sh

                #------------------------------------------------------------#
                # If the following variables are not set, use these defaults.#
                #------------------------------------------------------------#
                : ${script_name:=`basename $0`}
                : ${name_root:=`echo $script_name|$AWK '{sub(/^\.+/,"");sub(/\..*/,"");print}'`}
                : ${logger_p="user.err"}
                : ${logger_t="$LOGNAME[$$]"}
                : ${verbose:=0}
                : ${sp:="                    "}
                : ${dashes:="------------------------------------------------------"}
                : ${tmp:=/var/tmp}

                if [ ."$log" = . ]; then
                   log=$name_root.log
                   [ ."$teelog" = . ] && teelog="cat"
                fi

                CG_ID="$script_name($CG_name)"

                #--------------------------------------------------------------------#
                #               Process function options and arguments               #
                #               --------------------------------------               #
                # We use while-loop instead of getopts because -p (logger priority)  #
                # option and -t (logger tag option) may or may not have an optarg    #
                # (the user may just want the defaults).                             #
                #--------------------------------------------------------------------#
                CG_options="lptv"
                CG_opt_l=0
                CG_opt_p=0
                CG_opt_t=0
                CG_opt_v=0
                CG_pri="$logger_p" # $logger_p and $logger_t are assigned defaults
                CG_tag="$logger_t" # within library defaults.sh.
                CG_opts=""
                CG_args=""
                while [ ."$1" != . ]
                do
                   #-------------------------------------------------------------#
                   # If we have an option list (e.g. "-xyz") change that list to #
                   # individual "-x -y -z" options.  Else, just pass the option  #
                   # along.                                                      #
                   #-------------------------------------------------------------#
                   CG_n=`expr "$1". : '-.*'`
                   if [ $CG_n -gt 0 ]; then
                      if [ $CG_n -eq 2 ]; then
                         CG_optargs="$1"
                      else
                         CG_optargs=`echo "$1"|sed 's/[a-zA-Z]/-& /g;s/--*/-/'`
                      fi

                      for CG_optarg in $CG_optargs
                      do
                         case $CG_optarg in
                           -l ) CG_opt_l=1
                                . $SHLIB/write_err_to_syslogs.sh
                                ;;
                           -p ) if [ $CG_opt_l -eq 1 -a $CG_opt_p -eq 0 ]; then
                                   CG_opt_p=1
                                   if [ -`expr "$2" : '\(\-\)['$CG_options']'` != "--" ]; then
                                      CG_pri="$2"
                                      shift
                                   fi
                                else
                                   CG_opts="$CG_opts $CG_optarg"
                                fi
                                ;;
                           -t ) if [ $CG_opt_l -eq 1 -a $CG_opt_t -eq 0 ]; then
                                   CG_opt_t=1
                                   CG_tag="$2"
                                   if [ -`expr "$2" : '\(\-\)['$CG_options']'` != "--" ]; then
                                      CG_tag="$2"
                                      shift
                                   fi
                                else
                                   CG_opts="$CG_opts $CG_optarg"
                                fi
                                ;;
                           -v ) CG_opt_v=1
                                ;;
                         esac
                      done # for CG_optarg in $CG_optargs
                   else
                      [ ."$CG_args" != . ]       \
                        && CG_args="$CG_args|$1" \
                        || CG_args="$1"
                   fi
                   shift
                done # while [ ."$1" != . ]
                CG_opts=`expr "$CG_opts" : ' *\(.*\)'` # Strip leading blanks
                CG_args=`expr "$CG_args" : '|*\(.*\)'` # Strip leading stiles

                #----------------------------------------------------------#
                # If we still have args, then the first MUST be the group. #
                #----------------------------------------------------------#
                CG_status=0
                if [ ."$CG_args" != . ]; then
                   CG_group=""
                   echo "$CG_args"|awk -F\| '{for (i=1;i<=NF;i++) print $i}' \
                    | while read CG_file
                      do
                         if [ ."$CG_group" = . ]; then
                            CG_group="$CG_file" # 1st arg MUST be the perms.
                            CG_cmd="chgrp $CG_opts $CG_group"
                            continue            # Got it, so iterate our for-loop.
                         fi

                         CG_status=0
                         if [ ! \( -f "$CG_file" -o -d "$CG_file" \) ]; then
                            CG_m1="Skipping $CG_cmd '$CG_file'."
                            CG_m2="'$CG_file' not found!"
                            CG_m3="$script_name continues."
                            EMAIL_MSG "WARNING: $CG_ID" \
                              "${sp}$CG_m1"             \
                              "${sp}$CG_m2"             \
                              "${sp}$CG_m3"
                         elif [ -w "$CG_file" ]; then # If writable, then do ...
                            [ $verbose -eq 1 -o $CG_opt_v -eq 1 ] \
                              && echo "`date '+%Y-%m-%d %T'` $CG_cmd \"$CG_file\"" \
                                | $teelog
                            CG_stderr=`$CG_cmd "$CG_file" 2>&1`
                            CG_status=$?
                            if [ $CG_status -ne 0 ]; then
                               CG_m1="'$CG_cmd \"$CG_file\"'"
                               CG_m2="ERROR=$CG_stderr."
                               CG_m3="$script_name terminated."
                               CG_m4=`ls -al "$CG_file"|sed "s/^/$sp/"`
                               EMAIL_MSG "FATAL ERROR: $CG_ID"              \
                                 "${sp}$CG_m1"                              \
                                 "${sp}$CG_m2"                              \
                                 "${sp}$CG_m3  File list (if any) follows:" \
                                 "${sp}$dashes"                             \
                                 "$CG_m4"

                               if [ $CG_opt_l -eq 1 ]; then # Logger option? (1 = yes)
                                  WRITE_ERR_TO_SYSLOGS -p "$CG_pri" -t "$CG_tag" \
                                    "ABORT: $CG_ID $CG_m1 $CG_m2 $CG_m3"
                               fi
                               EXIT 1
                            fi # if [ $CG_status -ne 0 ]; then
                         else
                            CG_m1="Skipping '$CG_cmd \"$CG_file\"'"
                            CG_m2="$CG_file not writable!"
                            CG_m3="$script_name continues."
                            EMAIL_MSG "WARNING: $CG_ID" \
                              "${sp}$CG_m1"             \
                              "${sp}$CG_m2"             \
                              "${sp}$CG_m3"
                         fi # if [ -w $CG_file ]; then, else
                      done # while read CG_file
                   return 0
                fi # if [ ."$CG_args" != . ]; then

                #--------------------------------------------------------------------#
                # Reaching this point with zero status means insufficient args error.#
                #--------------------------------------------------------------------#
                CG_m1="Insufficient args."
                CG_m2="$script_name terminated."
                EMAIL_MSG "FATAL ERROR (Function): $CG_ID"                 \
                  "${sp}$CG_m1.\n"                                         \
                  "${sp}Usage: $CG_name -l -p priority -t tag -v"          \
                  "${sp}                     group fileid [...]\n"         \
                  "${sp}                -l = Notify via logger command"    \
                  "${sp}                     (default is false)"           \
                  "${sp}                -p = Logger priority string"       \
                  "${sp}                     (default is 'user.err')"      \
                  "${sp}                -t = Logger tag string"            \
                  "${sp}                     (default is '$LOGNAME[$$]')"  \
                  "${sp}                -v = Verbose\n"                    \
                  "${sp}Option notes: Option (-l) MUST precede -p and -t." \
                  "${sp}$CG_m2"
                if [ $CG_opt_l -eq 1 ]; then # Logger option? (1 = yes)
                   WRITE_ERR_TO_SYSLOGS -p "$CG_pri" -t "$CG_tag" \
                     "ABORT: $CG_ID $CG_m1 $CG_m2"
                fi

                EXIT 1
              } # "CG_" prefix identifies this function's local variables.
              fi

              #======================================================================#
              #                       D O C U M E N T A T I O N                      #
              #======================================================================#
              #                                                                      #
              #      Author: Bob Orlando (Bob@OrlandoKuntao.com)                     #
              #                                                                      #
              #        Date: December 14, 1996                                       #
              #                                                                      #
              #  Program ID: chgrp_exit_err.sh                                       #
              #                                                                      #
              #       Usage: CHGRP_EXIT_ERR -l -p priority -t tag -v \               #
              #                                   group fileid ...                   #
              #                                                                      #
              #                             -l = Notify via logger command           #
              #                                  (default is false)                  #
              #                             -p = Logger priority string              #
              #                                  (default is "user.err")             #
              #                             -t = Logger tag string                   #
              #                                  (default is "$LOGNAME[$$]")         #
              #                             -v = Verbose                             #
              #                                                                      #
              #              Option notes: Option (-l) MUST precede other options.   #
              #                            'UNIX command options' MUST follow        #
              #                            function options.  If command option      #
              #                            is -l, -p, or -t, and you've specified    #
              #                            function option -l, then you must also    #
              #                            supply both function options, -p and -t.  #
              #                                                                      #
              #     Purpose: Change group ownership of one or more files,            #
              #              reporting errors via email and logger, exiting          #
              #              on error.                                               #
              #                                                                      #
              # Description: This function adds no new functionality to the UNIX     #
              #              chgrp command beyond automatic notification/logging     #
              #              before exiting on error.  Notification is provided      #
              #              via the EMAIL_MSG library function.  Optionally         #
              #              (-l), the user may have the error logged in syslogs     #
              #              (/var/adm/messages) via logger command.  Logger -p      #
              #              and -t options and option arguments also may be         #
              #              be passed (both have defaults if omitted).              #
              #                                                                      #
              #     Globals: No global variables assigned from this function.        #
              #              "CG_" prefix identifies local function variables.       #
              #                                                                      #
              # Exit_status: Exits with failure (1) on error.  This is because       #
              #              any error while changing group file permissions is      #
              #              potentially a show stopper.                             #
              #                                                                      #
              #       Calls: EMAIL_MSG and EXIT library functions.                   #
              #              Optionally, WRITE_ERR_TO_SYSLOGS is also called.        #
              #                                                                      #
              #       Notes: DO NOT use this routine to chgrp $log and $mailmsg.     #
              #              Use CHGRP_EXIT_ERR_NOMAIL instead.  This is because     #
              #              this function calls EMAIL_MSG function (a function      #
              #              which uses both $log and $mailmsg to report problems).  #
              #              Any problems changing $log and $mailmsg, therefore,     #
              #              cannot be reported by EMAIL_MSG using mailx.            #
              #                                                                      #
              #    Modified: 2004-04-02 Bob Orlando                                  #
              #                 v1.17 * Expand $AWK testing and assignment.          #
              #                                                                      #
              #              2004-03-03 Bob Orlando                                  #
              #                 v1.16 * Change set|egrep|awk to just set|egrep.      #
              #                                                                      #
              #----------------------------------------------------------------------#
            
Artificial Intelligence is no match for natural stupidity.
©Copyright Bob Orlando, 1996-2011
All rights reserved.
http://www.OrlandoKuntao.com
E-mail: Bob@OrlandoKuntao.com
Last update: Jan. 26, 2011
by Bob Orlando