Re: quesion about bash -x

[Kerin Millar]

On Wed, 13 Oct 2021 11:02:28 +0800
"张俊" via <help-bash@gnu.org> wrote:

> hello！
> 
> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; can you tell me how to realize bash -x 
> function ?&nbsp; &nbsp;i cannot find any help infomation about it in 
> userguide. can you tell me where realize it in&nbsp; bash source?
> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Sincerely&nbsp;&nbsp;，I look forward to 
> hearing from you ！.

To begin with, the bash man page mentions that "all of the single-character 
shell options documented in the description of the set builtin command, 
including -o, can be used as options when the shell is invoked". So, that 
includes -x, and its behaviour is metioned by the section that describes the 
set builtin. See, also, `help set` and 
https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html. To 
find out where it is implemented in the source code, `grep -rin xtrace` might 
be useful.

-- 
Kerin Millar