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Old 08-31-2005, 12:34 PM   #1
Registered: Apr 2005
Location: Chicago, IL
Distribution: openSUSE 13.1
Posts: 357

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adding a rotating - to my bash script

I'm working on a script right now and I would like to add a rotating - after some of my echo text lines. It wouldn't have to really be linked to anything. I just want it there for eye candy purposes, and to show progress is being made. Does anyone have a link, tutorial, etc, that explains how to do this, or could tell me what this is called so I could look it up. Your help would be greatly appreciated.
Old 08-31-2005, 12:53 PM   #2
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Registered: Aug 2003
Location: Glasgow
Distribution: Fedora / Solaris
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It's pretty simple. You can echo backspaces with '\b' if you use the -e flag with 'echo', and you can suppress the newlines after an echo with -n.
echo -n "-"
while true
  sleep 1
  echo  -n -e "\b\\"
  sleep 1
  echo  -n -e "\b|"
  sleep 1
  echo  -n -e "\b/"
  sleep 1
  echo  -n -e "\b-"
Old 08-31-2005, 12:54 PM   #3
Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
Posts: 8,507

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Well, it's generally called a 'spinner'. You can use the \b escape sequence with echo to make echo backspace over a previous character. For example:
function spin_once {
    echo -n '-'
    sleep .1
    echo -ne '\b/'
    sleep .1
    echo -ne '\b|'
    sleep 1.
    echo -ne '\b\\\'
    sleep .1
for i in `seq 1 25` ; do spin_once ; done

Last edited by Matir; 08-31-2005 at 12:56 PM.
Old 08-31-2005, 01:05 PM   #4
Registered: Apr 2005
Location: Chicago, IL
Distribution: openSUSE 13.1
Posts: 357

Original Poster
Rep: Reputation: 31
Thank you so much, folks!


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