Обсуждение: cat infile | translate all occurences of "NOT NULL" to ""

what command do I use to substitute all occurences of a certain string (say,
"NOT NULL") with another arbitrary string, (e.g. "")?  I've tried grep and
tr, but can't figure it out.

Thanks,

Dan Browning
Network & Database Administrator
Cyclone Computer Systems

in vi you can type : and then 1,$s/oldstring/newstring/g
where 1 means start from the first line, $ means until the end of the file,
oldstring is what you want to replace, newstring is what you want to replace
it with, and the g means do it globally throughout the file.

e.g.    1,$s/NOT NULL//g     should work

Hope this helps
Tamsin

-----Original Message-----
From: pgsql-novice-owner@hub.org [mailto:pgsql-novice-owner@hub.org]On
Behalf Of Dan Browning
Sent: 11 September 2000 15:16
To: pgsql-novice@postgresql.org; redhat-list@redhat.com;
jsokel@mdsi-usa.com
Subject: [NOVICE] cat infile | translate all occurences of "NOT NULL" to
""


what command do I use to substitute all occurences of a certain string (say,
"NOT NULL") with another arbitrary string, (e.g. "")?  I've tried grep and
tr, but can't figure it out.

Thanks,

Dan Browning
Network & Database Administrator
Cyclone Computer Systems

cat infile | sed 's/NOT NULL//g'

should do it as well ...

On Mon, 11 Sep 2000, Tamsin wrote:

> in vi you can type : and then 1,$s/oldstring/newstring/g
> where 1 means start from the first line, $ means until the end of the file,
> oldstring is what you want to replace, newstring is what you want to replace
> it with, and the g means do it globally throughout the file.
>
> e.g.    1,$s/NOT NULL//g     should work
>
> Hope this helps
> Tamsin
>
> -----Original Message-----
> From: pgsql-novice-owner@hub.org [mailto:pgsql-novice-owner@hub.org]On
> Behalf Of Dan Browning
> Sent: 11 September 2000 15:16
> To: pgsql-novice@postgresql.org; redhat-list@redhat.com;
> jsokel@mdsi-usa.com
> Subject: [NOVICE] cat infile | translate all occurences of "NOT NULL" to
> ""
>
>
> what command do I use to substitute all occurences of a certain string (say,
> "NOT NULL") with another arbitrary string, (e.g. "")?  I've tried grep and
> tr, but can't figure it out.
>
> Thanks,
>
> Dan Browning
> Network & Database Administrator
> Cyclone Computer Systems
>
>

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org

The easiest thing is probably to use vi.  Then write
    :s/"NOT NULL"/""/gc
the `g' will do each occurence, and the `c' will ask
for confirmation.  Once you are sure everything will
be fine, let it do `all'.

Otherwise, you can use `sed', but that is weird...

W
--- Dan Browning <danb@cyclonecomputers.com> wrote:
> what command do I use to substitute all occurences
> of a certain string (say,
> "NOT NULL") with another arbitrary string, (e.g.
> "")?  I've tried grep and
> tr, but can't figure it out.
>
> Thanks,
>
> Dan Browning
> Network & Database Administrator
> Cyclone Computer Systems
>


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