Rundeck inline bash spinner output-CodePudding

Have some bash test code that have a spinner. Code seems like this

#!/bin/bash
sleep 5 &
pid=$!
frames="/ | \\ -"
while kill -0 $pid 2&>1 > /dev/null;
do
    for frame in $frames;
    do
        printf "\r$frame Loading..." 
        sleep 0.5
    done
done
printf "\n"

This code is write on a inline step.

The problem is, in output screen, spinner shows like this

/ Loading...| Loading...\ Loading...- Loading.../ Loading...| Loading...\ Loading...- Loading.../ Loading...| Loading...\ Loading...- Loading...

Anybody knows how to handle this situation in rundeck?

CodePudding user response：

Use echo instead of printf (take a look), but even using echo Rundeck output doesn't work as an interactive terminal, which means that you can't see the bar spinning.

Each update is printed as a new line/string. The best way is to see a "loading" effect is using an "update line", e.g:

x=1
echo "starting..."
while [ $x -le 5 ]
do
  sleep 2
  echo "***"
  x=$(( $x   1 ))
done
echo "done!"

Result.

CodePudding user response：

I don't know what "Rundeck" is or what your kill line is trying to do but in terms of implementing a spinner in bash, this works perfectly for me:

$ cat tst.sh
#!/usr/bin/env bash

frames=( '\\' '|' '/' '-' )
cnt=0
while ((   cnt < 10 ))
do
    for frame in "${frames[@]}"
    do
        printf "\r$frame Loading..."
        sleep 0.5
    done
done
printf "\n"

There's no way to see it spinning here of course but FWIW:

$ ./tst.sh
/ Loading...