Well,
I will it explain it by an example:

Lets take the command ps -eLf
it shows a lot of system admin stuff.

So if I am on the command line.

How can I see the program lines of this command and where is this command located in the structure ?

Many thanks.

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Okay, one part of my question is good summarized by chrism01.
Thank you.

But my main question is still missing:
If in the path /usr/bin/ps the file respectively command "ps" could be found, I want to see the source code of "ps".
How I can get it in linux ? It is still open source ;-)

Many thanks.

Scroll the console buffer up with Shift+PgUp. Works in most terminals.

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Or you could pipe the output through a pager like less or more.

Then you can search with /, ?, !, &, or &! to limit what is show. See the manual page, "man less", for how each of those are used.

There's several possible ways to interpret this.

The above answers assume you're referring to reading long output, and other interpretations might suggest pstree, or type -a ps, or other things.

I'm wondering if you're maybe asking how to see the source code of "ps", and how specifically it implements the three options you provided?

Not sure about RHEL, but for Debian, I start by going to the online man page (i.e. //manpages.debian.org/ps), then following the "package tracker" link (in this case it's //tracker.debian.org/procps) and on that page there's a "browse source code" link (where we can see the ps command is written in C, not Bash).

Navigating source code to discover how things are implemented can sometimes be simple and other times be more complex - there's no single approach that always works, and not much point going on if this turns out to not be what you're asking about...

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A long time ago that would have been by installing the Source RPM (.srpm) from the repository and examining the resulting files and directories. Either way it is now time to get your money's worth out of your expensive support contract with Red Hat and contact them about RHEL.

Do you want its path and its source?

If you want to see where it’s located in the filesystem, it’s “which ps”.

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By default, "which COMMAND" only searches the path, it ignores aliases and built-ins, and (depending on the version of which used) may or not support the -a/--all option.

Using "type COMMAND" will identify when the command would execute a file or something else - compare "which ls" and "which echo" to "type -a ls" and "type -a echo"; in many cases type will identify echo as a shell builtin and show an alias for ls (in addition to the path to the executable).

As others have noted, it's not clear whether you are interested in the output of ps or it's source code.

There are various ways, but on eg Centos 7.9
so its a binary executable and (most likely) written in C.
As above if you're on RHEL as per your sig, you could install the SRPM (source RPM), but the code is likely complex.

HTH

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https://gitlab.com/procps-ng/procps
https://gitlab.com/procps-ng/procps/...ref_type=heads