SOURCE $ & Bash

When Bash file.sh is started this way, it is set to the file name.

Source is Bash's built-in command to read the file into the current bash execution, which is equivalent to entering the command manually at the current bash , so $ is bash.

The sample code is as follows:

a.sh

Echo " In a.sh. \$0 is: $ A "

b.sh

Echo " In b.sh. \$0 is: $ A " . . /A.sh

Run as follows:

LxW ~$Echo$0 bashLxW~$ source A.SHinchA.SH. $0is : bashLxW~$ Source B.SHinchB.SH. $0is : bash inchA.SH. $0is : bashLxW~$ bash A.SH inchA.SH. $0Is:a.SHLxW~$ Bash B.SH inchB.SH. $0Is:b.SHinchA.SH. $0Is:b.SHLxW~$Echo$0 bashLxW~$

Reference:

What does the Linux shell mean by: http://zhidao.baidu.com/link?url= 5lnei7gpe4u59nhcqcuf6rjcwxyb3zkktr4zxiidcle7zltnmtug-8cazfzko6ojfckac6fl1ddjtyi1ftu7ankoz22t6nzfit-q4cuk8me

SOURCE $ & Bash