python - Have bash script execute multiple programs as separate processes -

as title suggests how write bash script execute example 3 different python programs separate processes? , able gain access each of these processes see being logged onto terminal?

edit: again. forgot mention i'm aware of appending & i'm not sure how access being outputted terminal each process. example run 3 of these programs separately on different tabs , able see being outputted.

you can run job in background this:

command & 

this allows start multiple jobs in row without having wait previous 1 finish.

if start multiple background jobs this, share same stdout (and stderr), means output interleaved. example, take following script:

#!/bin/bash # countup.sh  in `seq 3`;     echo $i     sleep 1 done 

start twice in background:

./countup.sh & ./countup.sh & 

and see in terminal this:

1 1 2 2 3 3 

but this:

1 2 1 3 2 3 

you don't want this, because hard figure out output belonged job. solution? redirect stdout (and optionally stderr) each job separate file. example

command > file & 

will redirect stdout and

command > file 2>&1 & 

will redirect both stdout , stderr command file while running command in background. this page has introduction redirection in bash. can view command's output "live" tailing file:

tail -f file 

i recommend running background jobs nohup or screen user2676075 mentioned let jobs keep running after close terminal session, e.g.

nohup command1 > file1 2>&1 & nohup command2 > file2 2>&1 & nohup command3 > file3 2>&1 &