スクリプトファイルのパスを追加する

#!/bin/sh
#add_path.sh

echo -n "Input add path [$HOME/bin]: "
read ANSWER

if [ ! "$ANSWER" ]; then
    SETPATH=$HOME/bin
else
    SETPATH=$ANSWER
fi

if [ ! -d "$SETPATH" ]; then
    echo "*** Directory \"$SETPATH\" not found."
    exit 0
fi

if [ $(echo $PATH | grep -c ${SETPATH}) = 1 ]; then
    echo "*** PATH \"$SETPATH\" already exist"
else
    export PATH="$PATH:$SETPATH"

    chmod u+rwx,g=rx,o=rx $SETPATH
    echo "Search Path addition Success!."
fi
echo "PATH -> $PATH"
unset ANSWER SETPATH

$ ./add_path.sh 
Input add path [/home/anmino/bin]: 
Search Path addition Success!.
PATH ->  /usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/anmino/bin