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I would like to introduce multithreading feature in my shell script.
I have a script which calls the function read_cfg() with different arguments. Each of these function calls are independent.
Would it be possible to instantiate these function calls (not scripts) parallelly. Please let me how can we achieve that.. ?
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When you execute a Bash script, it will at maximum use a single CPU thread, unless you start subshells/threads. If your machine has at least two CPU threads, you will be able to max-out CPU resources using multi-threaded scripting in Bash.
$2 is the second command-line argument passed to the shell script or function. Also, know as Positional parameters.
bash [filename] runs the commands saved in a file. $@ refers to all of a shell script's command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.
Sure, just add & after the command:
read_cfg cfgA & read_cfg cfgB & read_cfg cfgC & wait all those jobs will then run in the background simultaneously. The optional wait command will then wait for all the jobs to finish.
Each command will run in a separate process, so it's technically not "multithreading", but I believe it solves your problem.
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