[SOLVED] Probably a silly problem: why sed is not working?

dedec0 · 04-16-2017, 09:03 AM

Quote:

Originally Posted by hydrurga

Yes, but for a start, Bash isn't the only shell out there.

Whereis and Which simply search specific paths for specific filenames. To search for user-defined shell functions, you would have to start parsing shell-dependent start-up scripts in all the different filesystem locations that those scripts can exist, and parsing all the different forms/syntax that the functions can be written in. It could very quickly become unwieldy and unsustainable.

I am not sure to follow your ideas.

Bash is not the only shell out, fine. As I asked in the post I just sent, are declare/typeset present in other shells? Is it present in sh, for example? Yes would be my guess, because there are two names for the same command.

And I really cannot understand your second paragraph. Why do you think we need to search many places? It is just what the shells do for us everytime we type any command (indirectly, since they are defined at login, shell creation or by eventual scripts or commands)!

hydrurga · 04-16-2017, 01:00 PM

declare is Bash-specific. typeset was developed in ksh but is also supported in Bash.

To recapitulate, which and whereis are currently shell-agnostic. In order to incorporate user-defined shell functions, they would have to take into account all the shells that exist in Linux with all their different ways of defining these functions.

dedec0 · 04-16-2017, 01:32 PM

@hydrurga: I see. So the simpler sh does not have a way to list defined functions? And other shells (like tcsh) should have yet other ways to do the same?

Further, have you seen my post about making a shell function to do this job? What do you think of it?

MadeInGermany · 04-24-2017, 05:32 PM

Code:

set

dumps functions and aliases and settings, in all sh-style shells.

Code:

type sed

works for functions as well, in all sh-style shells.
Note that the which command comes from csh and might show csh-aliases (from your .cshrc) but never sh-aliases and functions!