Shell脚本编写（如果有），否则将与scp循环

Question

User=0
av="653"
ma="727"
pr="713"
mi="234"
n=192.168.1.20:/root/Ma
echo "Please select av ma ji im pr"
echo -n "First 2 initial of your Name eg: [av ma ji im pr]? "
read User
if [ "$User" = av ]
then
    echo `scp $User@$n .`
elif [ "$User" = ma ]
then    
    echo `scp $User@$n .`
elif [ "$User" = pr ]
then
    echo `scp $User@$n .`
elif [ "$User" = mi ]
then
    echo `scp $User@$n .`
else
    echo "UNKNOWN USER"
fi

The script is not working properly; I want the value of av which is 653

Answer 1

Are you after:

User=0
av="653"
ma="727"
pr="713"
mi="234"
n=192.168.1.20:/root/Ma
echo "Please select av ma ji im pr"
echo -n "First 2 initial of your Name eg: [av ma ji im pr]? "
read User
if [ "$User" = av ]
then echo `scp $av@$n .`
elif [ "$User" = ma ]
then echo `scp $ma@$n .`
elif [ "$User" = pr ]
then echo `scp $pr@$n .`
elif [ "$User" = mi ]
then echo `scp $mi@$n .`
else echo "UNKNOWN USER"
fi

If not, please clarify your question so it is clearer what you are seeking. I'm also not clear why you have the echo `scp $xy@$n .` notation — what is the benefit of that compared with just scp $xy@$n . ?

scp="echo scp"  # For testing; you'd use just scp=scp in production work
User=0
av="653"
ma="727"
pr="713"
mi="234"
n=192.168.1.20:/root/Ma
echo "Please select av ma ji im pr"
echo -n "First 2 initial of your Name eg: [av ma ji im pr]? "
read User
if [ "$User" = av ]
then $scp $av@$n .
elif [ "$User" = ma ]
then $scp $ma@$n .
elif [ "$User" = pr ]
then $scp $pr@$n .
elif [ "$User" = mi ]
then $scp $mi@$n .
else echo "UNKNOWN USER"
fi

When I tested the script above (file xx.sh ), the output was:

$ bash xx.sh
Please select av ma ji im pr
First 2 initial of your Name eg: [av ma ji im pr]? mi
scp 234@192.168.1.20:/root/Ma .
$

Note that in bash , you could use indirect expansion to simplify the code:

scp="echo scp"  # For testing; you'd use just scp=scp in production work
User=0
av="653"
ma="727"
pr="713"
mi="234"
n=192.168.1.20:/root/Ma
echo "Please select av ma ji im pr"
echo -n "First 2 initial of your Name eg: [av ma ji im pr]? "
read User
case "$User" in
(av|ma|pr|mi) $scp ${!User}@$n . ;;
(*) echo "UNKNOWN USER"
esac

This gives the same result as the prior script for the same input.