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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