how to run simultaneous commands

Question

I have a bash script.

f1 () 
{ 
    for ((i=1; i<6; i++))
    do
        a=$(echo -e "\033[41m ")        
        echo -n " $a";
        echo -en "\033[0m";
        sleep 1;
        echo -en "\b";
        echo -n ' '
    done
}

f2 () 
{

    a=$(echo -e "\033[41m \033[0m") 
    echo -en "\033[5;50H$a"
    for ((i=1; i<6; i++))
    do
        echo -en "\b"
        echo -en ' '
        echo -en "\b\b"
        echo -n "$a"
        sleep 1
        echo -en "\033[0m"
    done
}

f1
f2

f1 shifts the object to the right; f2 shifts another object to the left;

what can I do to execute both functions at the same time, so that I see both objects move at the same time?

#this wont work
f1 & 
f2 &

I installed parallel,though am getting error message after running the code in the answer. — computer10
– computer10, Commented Apr 9, 2014 at 10:11
the error message is :parallel: Input is read from the terminal. Only experts do this on purpose. Press CTRL-D to exit. — computer10
– computer10, Commented Apr 9, 2014 at 10:18

agilob · Accepted Answer · 2014-04-09 09:19:46Z

1

Run them in background with parallel:

  #export functions so parallel can see them
  export -f f1
  export -f f2
  #run both functions
  parallel f1 f2

edited Apr 9, 2014 at 9:19

answered Apr 9, 2014 at 8:57

agilob

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6 Comments

Fredrik Pihl Over a year ago

also, wait is useful as well. Since it, well, waits for all subproceses to finish before continuing. To run something truly parallel, google gnu parallel

agilob Over a year ago

Oh, true, I didn't understand the last line, you need to use parallel for this.

agilob Over a year ago

@computer10 this version does the job.

computer10 Over a year ago

i need to install parallel for ubuntu 64 bit.can you give me immediate instructions. apt-get ... or link.

agilob Over a year ago

sudo apt-get install parallel

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