Re: Bug in bash
On Fri, Sep 28, 2001 at 06:20:51PM -0400, Bruce Jackson wrote:
> Jens Ruehmkorf wrote:
> > On Fri, 28 Sep 2001, Bruce Jackson wrote:
> >>If I do the following: echo "bob\n" the output is:
> > $ echo "bob\n"
> > bob\n
> > $ echo -e "bob\n"
> > bob
> > See bash(1), do "help echo" inside bash. Ask debian-user for help.
> But, why is there a difference between the behaviour of bash under
> Linux, HP-UX, and Solaris? The protability of scripts is the problem.
Have a look at the autoconf info documentation, under 'Limitations of
The simple `echo' is probably the most surprising source of
portability troubles. It is not possible to use `echo' portably
unless both options and escape sequences are omitted. New
applications which are not aiming at portability should use
`printf' instead of `echo'.
Do not use backslashes in the arguments, as there is no consensus
on their handling. On `echo '\n' | wc -l', the `sh' of Digital
Unix 4.0, MIPS RISC/OS 4.52, answer 2, but the Solaris' `sh', Bash
and Zsh (in `sh' emulation mode) report 1. Please note that the
problem is truly `echo': all the shells understand `'\n'' as the
string composed of a backslash and an `n'.
Colin Watson [email@example.com]