menu3 ()
{ if [[ "$enter" =~ ^[0-9]+$ ]] then clear echo "+)Add" echo "-)Subtract" echo "X)Exit" read -p "Please choose a item: " choice else exit fi }
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menu3 ()
{ if [[ "$enter" =~ ^[0-9]+$ ]] then clear echo "+)Add" echo "-)Subtract" echo "X)Exit" read -p "Please choose a item: " choice else exit fi }
转载于:https://my.oschina.net/u/2275100/blog/1603517