Linux invoke/reference/Include script file method in Shell

Script A (test example 1)

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#!/bin/bash Echo ' Your are in the '

Q) Call another script file in the current script file?

Method One: Using source

Script second (test example 2)

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#!/bin/bash Echo ' Your are in second file ' SOURCE A

Method Two: use.

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Script second (test example 3) #!/bin/bash Echo ' Your are in second file ' . The

SOURCE filename and. FileName should be the same thing, both executing scripts in the * current *shell environment. You can also use the SH filename, which executes the script in the child shell of the current shell.

You can use the following two feet to realize the difference between three ways of calling:

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1.sh #!/bin/bash A=b echo "PID for 1.sh before exec/source/fork:$$" Export A echo "1.sh: $A is $A" Case is in exec echo "Using exec ..." exec./2.sh;; Source echo "Using Source ..." . ./2.sh;; *) echo "Using fork by default ..." ./2.sh;; Esac echo "PID for 1.sh after exec/source/fork:$$" echo "1.sh: $A is $A" 2.sh #!/bin/bash echo "PID for 2.sh: $$" echo "2.sh get $A = $A from 1.sh" A=c Export A echo "2.sh: $A is $A" Implementation status: $./1.sh PID for 1.sh before exec/source/fork:5845364 1.sh: $A are B using fork by default ... PID for 2.sh:5242940 2.sh get $A =b from 1.sh 2.sh: $A are C PID for 1.sh after exec/source/fork:5845364 1.sh: $A is b $./1.sh exec PID to 1.sh before exec/source/fork:5562668 1.sh: $A is b using exec ... PID for 2.sh:5562668 2.sh get $A =b from 1.sh 2.sh: $A are C $./1.sh source PID for 1.sh before exec/ source/fork:5156894 1.sh: $A is B using source ... PID for 2.sh:5156894 2.sh get $A =b from 1.sh 2.sh: $A are C PID for 1.sh after exec/source/fork:5156894 1.sh: $A is C $