Ubuntu – Terminal command with sudo takes a long time

[I still would like to know if there is a better answear.]

I found a way that works, and the prompt will be kept on a single line:

at the end of your ~/.bashrc add this:

function FUNCsudoOn() { 
    if sudo -n uptime 2>/dev/null 1>/dev/null; then 
        echo -ne "\E[0m\E[93m\E[41m\E[1m\E[5m SUDO \E[0m"; 
        #echo #without newline, the terminal seems to bugout with lines that are too big... discomment this if you find any problems...
    fi; 
}
function FUNCpromptCommand () { 
    FUNCsudoOn
}
export PROMPT_COMMAND=FUNCpromptCommand
#export PS1="\`FUNCsudoOn\`$PS1" #this also works, use instead of PROMPT_COMMAND

EDIT: I found that sudo -n uptime will update the sudo timeout, so everytime you hit the Enter key, that sudo time will be updated... That makes knowing the remaining time useless, as it will always be the configured one, defaulting to 15min...

and to find the best colors formatting for you taste you can use ScriptEchoColor with --escapedchars option like:

echoc --escapedchars "@{nRlyo} SUDO " #that outputs below...
echo -e "\E[0m\E[93m\E[41m\E[1m\E[5m SUDO \E[0m"

to just stop the blinking remove \E[5m like in \E[0m\E[93m\E[41m\E[1m SUDO \E[0m

Not knowing exactly what's being done, I can only speak generally:

• Reads are simply reads from memory or disk.
• Writes have to check constraints, action triggers and then write to disk. Usually within a transaction that needs to be setup, actioned committed and then cleaned up. And then there's cache invalidation.
• Most disks (and their filesystems) read much faster than they write.

I'm not surprised a restore takes longer than a backup but if you really think it's erroneously long, benchmark your queries and work out what the problem is.