UNIX for Dummies Questions & Answers

for SHELL in /bin/bash /bin/jsh /bin/pfcsh /bin/pfsh /bin/tcsh /sbin/jsh /usr/bin/csh /usr/bin/ksh /usr/bin/pfksh /usr/bin/sh /usr/bin/zsh /usr/xpg4/bin/sh /bin/csh /bin/ksh /bin/pfksh /bin/sh /bin/zsh /sbin/pfsh /usr/bin/bash /usr/bin/pfcsh /usr/bin/pfsh /usr/bin/tcsh /usr/sfw/bin/zsh; do
    if [ -s $SHELL ]; then
        echo $SHELL exists!!
    fi;
done

awk -F: '{ print $7 }' < /etc/passwd | sort -u | while read LINE
do
        BASE=`basename $LINE`
        case "$BASE" in
        ksh)  ;;
        csh)  ;;
        tcsh) ;;
        sh)   ;;
        bash) ;;
        zsh)   ;;
        *) continue ;; # Avoid things like /bin/nologin, /sbin/halt...
        esac
        echo "$LINE"
done