shell 分支/循环

if((i%==)); then
    patern="Update"
else
    patern="Read"
fi

case $ in
"-h")
    if [ $# -lt  ]
        then
            helpInfo
    else
        errorUse $@
    fi
    ;;
"-d")
    if [ $# -lt  ]
        then
            noDirectory
    elif [ $# -gt  ]
        then
            errorUse $@
    else
        DIR=$
    fi
    ;;
*)
    errorUse $@
    ;;
esac

for i in `seq `
do
...
done

------------------->$ seq 

------------------->$ seq  

------------------->$ seq   

------------------->$ for i in {..}; do echo "$i"; done