On Thu, 24 Mar 2016, Ron Yorston wrote:
>
> and specifically about 'r':
>
>If rfile does not exist or cannot be read, it shall be treated as if
>it were an empty file, causing no error condition.
My observation, looking at the strace from GNU sed, is it attempts to
open a file with
I was curious what POSIX says and how other *nix systems would handle
Christian's examples.
On the 'r' command POSIX makes a general comment:
The r and w command verbs, and the w flag to the s command, take an
rfile (or wfile) parameter...
and specifically about 'r':
If rfile does not
busybox generally follows a pretty simple flow:
(1) is the behavior you're looking at explicitly documented by POSIX ?
if yes, then do what POSIX says & you're done
(2) is the behavior described as "implementation defined" by POSIX ?
if yes, do whatever produces smaller code
(3) is the
On Wed, 23 Mar 2016, Ralf Friedl wrote:
>
> On the other hand, I don't know why busybox sed needs exactly one space
> between command and filename. GNU sed works with zero or more spaces.
Good points, everyone. Thanks. Still...
# Note, the input file /tmp/bar lacks the on the last line
#
On 3/23/2016 12:12 PM, Ralf Friedl wrote:
Cristian Ionescu-Idbohrn wrote:
sed (GNU sed) 4.2.2 can do this:
$ printf 'foo
bar
baz' | sed r -
foo
bar
baz
or, after storing the text in a file:
$ printf 'foo
bar
baz' >/tmp/bar
$ sed r /tmp/bar
foo
Cristian Ionescu-Idbohrn wrote:
sed (GNU sed) 4.2.2 can do this:
$ printf 'foo
bar
baz' | sed r -
foo
bar
baz
or, after storing the text in a file:
$ printf 'foo
bar
baz' >/tmp/bar
$ sed r /tmp/bar
foo
On Wed, 23 Mar 2016, Ron Yorston wrote:
>
> Since the 'r' command requires a space before the filename it will need
> to be quoted. Some of your examples have quotes and some don't so you
> aren't always comparing the same thing.
Right. Still. The different behaviour confused me.
> "sed r -"
Cristian,
Since the 'r' command requires a space before the filename it will need
to be quoted. Some of your examples have quotes and some don't so you
aren't always comparing the same thing.
"sed r -" is an 'r' command with no filename while the "sed 'r -'" is an
'r' command with a filename of
sed (GNU sed) 4.2.2 can do this:
$ printf 'foo
bar
baz' | sed r -
foo
bar
baz
or, after storing the text in a file:
$ printf 'foo
bar
baz' >/tmp/bar
$ sed r /tmp/bar
foo
bar
baz
But busybox
