Re: sed 0a

[Davide Brini]

On Tuesday 01 Jun 2010 14:45:46 address@hidden wrote:

> $ date|sed 0a\\hi
> sed: -e expression #1, char 2: invalid usage of line address 0
> Huh? It is valid in ed(1).

But not in sed. Here's from the docs:

`0,/REGEXP/'
     A line number of `0' can be used in an address specification like
     `0,/REGEXP/' so that `sed' will try to match REGEXP in the first
     input line too.
     ...

     Note that this is the only place where the `0' address makes
     sense; there is no 0-th line and commands which are given the `0'
     address in any other way will give an error.


To do what you're trying to do, use

date | sed 1i\\hi

although GNU sed also supports 

date | sed 1ihi

-- 
D.