On 05/06/2023 13:23, Neeraj Kumar wrote:
> I have two version; please help me to get the version in the form of 7 or 8
>

grep -o -E "7|8" /etc/redhat-release

--
Chris Elvidge
England

On Monday, June 5, 2023 at 6:19:02 PM UTC+5:30, Chris Elvidge wrote:
> On 05/06/2023 13:23, Neeraj Kumar wrote:
> > I have two version; please help me to get the version in the form of 7 or 8
> >
> grep -o -E "7|8" /etc/redhat-release
>
> --
> Chris Elvidge
> England

Thank you for the reply..
if the Linux is 8.7 then it will not give proper output.

can we have this by awk command .. I tried multiple but unlucky to get in single line

Chris Elvidge <chris@mshome.net> writes:

> On 05/06/2023 13:23, Neeraj Kumar wrote:
>> I have two version; please help me to get the version in the form of 7 or 8
>>
>
> grep -o -E "7|8" /etc/redhat-release

This will say 7 for release 6.7 (not that I know there ever was such a
release number) but even given the OPs restriction to 7 or 8, version
7.8 will give two lines.

One way (if one's grep has them) would be to use Perl REs and employ a
"lookbehind" assertion:

grep -o -P '(?<=release )\d+' /etc/redhat-release

but then it's not at all clear what OP really wants.

To the OP: it's generally better to look in /etc/os-release.

--
Ben.

On 05.06.2023 15:14, Neeraj Kumar wrote:
> On Monday, June 5, 2023 at 6:19:02 PM UTC+5:30, Chris Elvidge wrote:
>> On 05/06/2023 13:23, Neeraj Kumar wrote:
>>> I have two version; please help me to get the version in the form of 7 or 8
>>>
>> grep -o -E "7|8" /etc/redhat-release
>>
>> --
>> Chris Elvidge
>> England
>
> Thank you for the reply..
> if the Linux is 8.7 then it will not give proper output.

You could use sed for the extraction of the number

echo " 8.7 "| sed 's/.*\([78]\)[.].*/\1/'

or shell's expr

expr " 8.7 " : '.*\([78]\)[.].*'

(In both cases taking the digit 7 or 8 in front of a literal dot.)

>
> can we have this by awk command .. I tried multiple but unlucky to get in single line

Why awk?

With Ben's suggestion for the source of the version information

awk -F[=\".] '/VERSION=/{print $3}' /etc/os-release

(can of course also done with sed or shell in a most simple way).

Janis

On 05.06.2023 15:55, Janis Papanagnou wrote:
>
> or shell's expr

Erm.. - it's not a shell built-in but an ordinary command.

Janis

On 2023-06-05, Neeraj Kumar <neeraj.friendslover@gmail.com> wrote:
> On Monday, June 5, 2023 at 6:19:02 PM UTC+5:30, Chris Elvidge wrote:
>> On 05/06/2023 13:23, Neeraj Kumar wrote:
>> > I have two version; please help me to get the version in the form of 7 or 8
>> >
>> grep -o -E "7|8" /etc/redhat-release
>>
>> --
>> Chris Elvidge
>> England
>
> Thank you for the reply..
> if the Linux is 8.7 then it will not give proper output.

If Linux is 8.7, today can't be 2023. The current stable version is
6.3.6, with a 6.4-rc5 (release candidate 5) on the mainline.

See https://kernel.org

--
TXR Programming Language: http://nongnu.org/txr
Cygnal: Cygwin Native Application Library: http://kylheku.com/cygnal
Mastodon: @Kazinator@mstdn.ca

Kaz Kylheku <864-117-4973@kylheku.com> writes:
> On 2023-06-05, Neeraj Kumar <neeraj.friendslover@gmail.com> wrote:
[...]
>> if the Linux is 8.7 then it will not give proper output.
>
> If Linux is 8.7, today can't be 2023. The current stable version is
> 6.3.6, with a 6.4-rc5 (release candidate 5) on the mainline.
>
> See https://kernel.org

Kaz's point is that Linux (the kernel) and Red Hat (the operating
system) are two different things with different version numbers.
/etc/redhat-release has information about the OS.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */

On 2023-06-05, Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
> Kaz Kylheku <864-117-4973@kylheku.com> writes:
>> On 2023-06-05, Neeraj Kumar <neeraj.friendslover@gmail.com> wrote:
> [...]
>>> if the Linux is 8.7 then it will not give proper output.
>>
>> If Linux is 8.7, today can't be 2023. The current stable version is
>> 6.3.6, with a 6.4-rc5 (release candidate 5) on the mainline.
>>
>> See https://kernel.org
>
> Kaz's point is that Linux (the kernel) and Red Hat (the operating
> system) are two different things with different version numbers.
> /etc/redhat-release has information about the OS.

Unlike some, I don't have a problem with Red Hat being called a
"Linux distribution", but when you start talking about it it being
Linux 8.7, we have crossed the blurry line between political
and stupid.

--
TXR Programming Language: http://nongnu.org/txr
Cygnal: Cygwin Native Application Library: http://kylheku.com/cygnal
Mastodon: @Kazinator@mstdn.ca

Kaz Kylheku <864-117-4973@kylheku.com> writes:
> On 2023-06-05, Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
>> Kaz Kylheku <864-117-4973@kylheku.com> writes:
>>> On 2023-06-05, Neeraj Kumar <neeraj.friendslover@gmail.com> wrote:
>> [...]
>>>> if the Linux is 8.7 then it will not give proper output.
>>>
>>> If Linux is 8.7, today can't be 2023. The current stable version is
>>> 6.3.6, with a 6.4-rc5 (release candidate 5) on the mainline.
>>>
>>> See https://kernel.org
>>
>> Kaz's point is that Linux (the kernel) and Red Hat (the operating
>> system) are two different things with different version numbers.
>> /etc/redhat-release has information about the OS.
>
> Unlike some, I don't have a problem with Red Hat being called a
> "Linux distribution", but when you start talking about it it being
> Linux 8.7, we have crossed the blurry line between political
> and stupid.

My point was not about the politics of referring to a distribution as
"Linux". My point was that the person you were addressing might not
have understood what you were talking about.

Neeraj wrote something incorrect. That doesn't imply they're stupid.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */