linux - Add a display to let user wait in bash

I am looking for a pretty stupid piece of code for bash that will show a kind of "please wait" rolling display, with the characters : - \ | /

The first problem is that I don't know the name of this thing, so it is a bit difficult to find, and the other is could you please provide a scriptlet please ?

Thank you in advance,

Olivier

They're called 'spinners'. Linux Journal has an article with example code.

Thanks a lot for the valuable help. I had a look at all pieces of code, and they all seem pretty long for what I am doing.

So based on that I just redid a tiny piece of code I am sharing with you.

#! /bin/bash
state=1
delay=0.5
printf "-"
sleep $delay

while [ 1 ]
do
        printf "\b"
        case $state in
                0) printf "-";;
                1) printf "\\";;
                2) printf "|";;
                3) printf "/";;
        esac
        if [ $state -eq 3 ]
        then
                state=0;
        else
                state=$((state+1));
        fi
        sleep $delay
done

Of course, this can work as a standalone code, but take out the bash line, and you can insert it easily in a script, and eventually shrink it a bit more. The only thing is about the condition, which is now running forever, so have to get out your own condition for the stop.

Hope you'll find it useful. ;-)

They're also called 'Throbbers'. For an implementation plus explanation how to use it see http://fitnr.com/showing-a-bash-spinner.html (disclaimer: I haven't tested it myself, but I overlooked it and it looks reasonable)

Could you try the below code for "please wait" process bar / spinners.

 #!/bin/bash
 echo -e "Please wait ..."
 while true;
 do
 echo -ne '-\r'
 sleep .2
 echo -ne '\\\r'
 sleep .2
 echo -ne '|\r'
 sleep .2
 echo -ne '/''\r'
 sleep .2
 echo -ne '-\r'
 done

or

try

 #!/bin/bash
 echo -n "Please wait..."
 while true
 do
      echo -n "."
      sleep .2
 done

Its working for me...