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echo command
I tried
1) echo --help and
2) echo --version
but they doesn't seem to work. I am using version 5.0.3 of knoppix
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Senior Member
registered user
Re: echo command
Originally Posted by
Lerner
I tried
1) echo --help and
2) echo --version
but they doesn't seem to work. I am using version 5.0.3 of knoppix
(I'm using Knoppix 4.0.2, but this is likely same in your Knoppix also)
The "problem" is that there are 2 different versions of "echo":
1. The one provided internally by bash-shell
2. The one located at /bin/echo
First one is used by default when you just use echo on bash command-line, and is documented at man bash-builtins. This one doesn't support --help or --version.
The second one is documented at man echo and does support --help and --version.
Code:
knoppix@0[knoppix]$ echo --version
--version
knoppix@0[knoppix]$ /bin/echo --version
echo (GNU coreutils) 5.2.1
Written by FIXME unknown.
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
There are also few other differences, like support for hexadecimal escapes:
Code:
knoppix@1[knoppix]$ echo -e "\x41\x42\x43"
ABC
knoppix@1[knoppix]$ /bin/echo -e "\x41\x42\x43"
\x41\x42\x43
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Re: echo command
Thanks
There are also few other differences, like support for hexadecimal escapes:
Code:
knoppix@1[knoppix]$ echo -e "\x41\x42\x43"
ABC
knoppix@1[knoppix]$ /bin/echo -e "\x41\x42\x43"
\x41\x42\x43
In both the above cases output was ABC.
-
Senior Member
registered user
Re: echo command
Originally Posted by
Lerner
Thanks
There are also few other differences, like support for hexadecimal escapes:
Code:
knoppix@1[knoppix]$ echo -e "\x41\x42\x43"
ABC
knoppix@1[knoppix]$ /bin/echo -e "\x41\x42\x43"
\x41\x42\x43
In both the above cases output was ABC.
You might have newer version of /bin/echo than I do, which supports this.
-
Senior Member
registered user
For a complete list of bash-built-in-commands just type 'help'.
To get a help page about a built-in-bash-command type 'help command', in this case 'help echo'.
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