group-compare

#!/bin/bash
# compare group member with MyGroups
# Ruoshi Sun
# 2020-10-26: use comm; add "Remove"
# 2020-01-24

GROUP="https://rci.hpc.virginia.edu/filesplus/group.txt"
TMP1=$(mktemp)
TMP2=$(mktemp)

for g in $@; do
    echo ["$g"]
    curl -s $GROUP | sed -n "s/^${g}:.*://p" | tr ',' '\n' >$TMP1
    getent group $g| sed 's/^.*://' | tr ',' '\n' | sort >$TMP2

    N1=$(wc -l <$TMP1)
    N2=$(wc -l <$TMP2)

    echo "group.txt ($N1):"
    cat $TMP1 | tr '\n' ' '
    echo
    echo "rivanna ($N2):"
    cat $TMP2 | tr '\n' ' '
    echo

    ADD=( $(comm -1 -3 $TMP2 $TMP1 ) )
    REMOVE=( $(comm -1 -3 $TMP1 $TMP2 ) )

    echo
    if [[ ${#ADD[@]} -eq 0 && ${#REMOVE[@]} -eq 0 ]]; then
        echo "Identical"
    else
        if [ ${#ADD[@]} -ne 0 ]; then
            echo "Add (${#ADD[@]}):"
            echo ${ADD[@]}
        fi
        if [ ${#REMOVE[@]} -ne 0 ]; then
            echo "Remove (${#REMOVE[@]}):"
            echo ${REMOVE[@]}
        fi
    fi
done

rm $TMP1 $TMP2