Shell Execution Order

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Shell script to today, I can only kept sequential execution, try to explore its more powerful features.

A main file, main, three call files Shell1, Shell2, Shell3, the calling file differs only in the display content. (no background Execution (&) is used in main, then the content is displayed after the end of the execution of the call, and then done in turn.) ) script as follows:

[email protected] lab-shell-script]$ cat Main#!/bin/bash. Shell1 &. Shell2 &. Shell3 &echo "Shell script ends."

[[email protected] lab-shell-script]$ cat shell1#!/bin/bashfor ((i=0; i<3; i++));    Do echo "$i, Hello file." Sleep 1done

Look at the results after execution, .... ( the contents of the calling file are not displayed until the main file execution finishes.) Also, the execution order of the calling file is "unordered")

[[email protected] lab-shell-script]$./mainshell script ends.1, hello Mtf[[email protected] lab-shell-script]$ 1, hello y Angtao1, hello Sunny2, hello sunny2, hello mtf2, hello Yangtao3, hello sunny3, hello Yangtao3, hello MTF

Shell Execution Order