如何退出bash脚本

Question

我有一个case命令，它有几个选项，其中一个用于失败的存储空间大小。

#################### System Information Tests ##############################
export HOME=`cd;pwd`
export Storage_Space_Size=$(df -h --output=avail ${HOME} | awk 'NR==2 {print $1}' | tr -cd '[:digit:]')
export Storage_Space_Units=$(df -h --output=avail ${HOME} | awk 'NR==2 {print $1}' | tr -cd '[:alpha:]')
export Storage_Space_Required="350"
echo " Testing for Storage Space for installation"
echo " "
case $Storage_Space_Units in
[Pp]* )
echo "Sufficient storage space for installation found" ;;
[Tt]* )
echo "Sufficient storage space for installation found" ;;
[Gg]* )
if [[ ${Storage_Space_Size} -lt ${Storage_Space_Required} ]]; then
echo "Not enough storage space for installation"
else echo "Sufficient storage space for installation found."
fi ;;
[MmKk]* )
echo "Not enough storage space for installation."
exec $SHELL ;;
* )
echo "Not enough storage space for installation."
exec $SHELL ;;
esac
echo " "

exec$SHELL是退出脚本的最佳方式吗？还是有其他方法？

退出脚本而不保留失败环境的替代方法

Answer 1

################### System Information Tests ##############################
if [ "$SYSTEMOS" = "Linux" ]; then
export HOME=`cd;pwd`
export Storage_Space_Size=$(df -h --output=avail ${HOME} | awk 'NR==2 {print $1}' | tr -cd '[:digit:]')
export Storage_Space_Units=$(df -h --output=avail ${HOME} | awk 'NR==2 {print $1}' | tr -cd '[:alpha:]')
export Storage_Space_Required="350"
echo "-------------------------------------------------- "
echo " "
echo " Testing for Storage Space for installation"
echo " "
case $Storage_Space_Units in
[Pp]* )
echo " "
echo "Sufficient storage space for installation found"
echo "-------------------------------------------------- " ;;
[Tt]* )
echo " "
echo "Sufficient storage space for installation found"
echo "-------------------------------------------------- " ;;
[Gg]* )
if [[ ${Storage_Space_Size} -lt ${Storage_Space_Required} ]]; then
echo " "
echo "Not enough storage space for installation"
echo "-------------------------------------------------- "
exit
else
echo " "
echo "Sufficient storage space for installation found."
echo "-------------------------------------------------- "
fi ;;
[MmKk]* )
echo " "
echo "Not enough storage space for installation."
echo "-------------------------------------------------- "
exit ;;
* )
echo " "
echo "Not enough storage space for installation."
echo "-------------------------------------------------- "
exit ;;
esac
echo " "
fi

if [ "$SYSTEMOS" = "MacOS" ]; then
while true; do
read -r -p "Do you have minimum of 350GB of FREE storage space available for this instllation (Y/N) " yn
case $yn in
[Yy]* )
echo "-------------------------------------------------- "
echo " "
echo "Installation will move forward"
break
;;
[Nn]* )
echo " "
echo "Not enough storage space available. Exiting script."
break
;;
* ) echo "Please answer yes or no.";;
esac
done
fi