A brief talk on the bash scripting programming variables

Bash (GNU Bourne-again Shell) is a Unix shell written for the GNU program, which is the default shell used by many Linux platforms.

Variables for bash scripting:

1. $BASH

Represents the path of a bash binary program file

Eg: Edit the bash file, such as 1.sh, in which the following code is entered:

Then save the run and the path to the bash script interpreter will appear.

2. $FUNCNAME

Represents the name of the current function

Eg: Edit bash file 2.sh, where you enter the following code:

The results of running the bash file are as follows:

$FUNCNAME acts in the body of a function, the scope of the function is exceeded to become a null value.

3. $IFS

Represents the internal domain delimiter

Eg: Edit bash file 3.sh and enter the following code:

Then save the code to run the following results:

4. $REPLY

When no parameter variable is supplied to the Read command, the variable is supplied to the Read command as a default variable. It can also be used with the Select menu, but only the number of the selected variable, not the value of the variable itself.

Eg: Edit bash file 4.sh and enter the following code:

Save and run to get the following results (the Yellow line part of the content is keyboard input!!!) ）：

As you can see from the results, $reply will be supplied to the Read command as the default variable, so the output value of the subsequent $reply is still the value entered when Read!!!

A brief talk on the bash scripting programming variables