将参数传递给远程SSH

Question

I have a function:

function obtener_resumen(){
 ssh  root@${1} '
   echo "grep -iE ${2} ${3}";
   ifconfig;
 ' > "${4}"
}

I call it:

obtener_resumen "MY_IP" "PATRON" "/MY_FILE.txt" "/demo.log"

When I open demo.log only I see:

grep -iE

When I need grep -iE PATRON /MY_FILE.txt

It's possible this?. I appreciate your help .

Answer 1

You want the expansion to happen on the client side, so you can use double quotes to expand the value before it's passed to ssh :

# Unsafe version
function obtener_resumen(){
 ssh  root@${1} "
   echo \"grep -iE ${2} ${3}\";
   ifconfig;
  " > "${4}"
}

But to prevent command injection, use printf %q :

#Safe version
function obtener_resumen(){
 ssh  root@${1} "$(printf "%q " echo grep -iE "$2" "$3"); ifconfig" > "$4"
}