source code

mohit_parihar · 12-01-2009, 03:23 AM

can any body tell me where can i found the source code for echo command. so that i can download it such that it can help me for further studies on echo command

gnufreex · 12-01-2009, 03:36 AM

The echo command have two pieces. One is in Linux kernel, other one in shell. So that is where you should be looking.

pixellany · 12-01-2009, 07:03 AM

Quote:

Originally Posted by gnufreex

The echo command have two pieces. One is in Linux kernel, other one in shell. So that is where you should be looking.

How does this relate to finding the source code???!!! You seem to be saying that to find the source code, one should look in the kernel or the shell. Please explain.

@mohit*;

A Google search shows first that "echo" is both a BASH built-in, and is also a separate command (/bin/bash). I don't know how they differ.

I found the source code for BASH here:
http://ftp.gnu.org/gnu/bash/

Some more time with Google will find the source for /bin/echo.

Google is your friend.......

i92guboj · 12-01-2009, 07:52 AM

Either a shell builtin or part of coreutils. It depends on what you are using. So, you either need the sources for your shell or the sources for coreutils.

gnufreex · 12-02-2009, 05:34 AM

Type

which echo

to find out what instance do you use.

@pixellany

If it is built in kernel, than he need to downloade source code of kernel and look there. If it is shell, than your link will do.

pixellany · 12-02-2009, 06:42 AM

Quote:

Originally Posted by gnufreex

Type

which echo

to find out what instance do you use.

If I do this, it comes up with /bin/echo. If I then disable /bin/echo, echo still works. I believe that the built-in gets run by default.

Quote:

@pixellany

If it is built in kernel, than he need to downloade source code of kernel and look there. If it is shell, than your link will do.

echo is not built into the kernel. It is built into bash (one option), and also exists as a standalone utility. (My issue with your other post is that you did not answer the question of where to get the source code.)

i92guboj · 12-02-2009, 06:44 AM

Quote:

Originally Posted by pixellany

If I do this, it comes up with /bin/echo. If I then disable /bin/echo, echo still works. I believe that the built-in gets run by default.

It does. That why the output of "which" is irrelevant if you want to find what are you running. For that you use

Code:

type echo

Which in your case will output:

Code:

echo is a shell builtin

pixellany · 12-02-2009, 07:05 AM

Quote:

Which in your case will output:

Code:

echo is a shell builtin

Yup!!

gnufreex · 12-02-2009, 10:55 AM

Quote:

Originally Posted by pixellany

echo is not built into the kernel. It is built into bash (one option), and also exists as a standalone utility. (My issue with your other post is that you did not answer the question of where to get the source code.)

I did not provided a link to source because I thought he just asks for hint where to look, or what word to type in google. Sorry for not being clear.