Re: Best way to edit Linux files in z/VM 3270

[Martha McConaghy]

I prefer ed, myself.  It reminds me of the old days, before we had full screen
editors.  Screw up enough fstab or network config files and you get real good
at it.  Always
impresses my younger colleages when I can fix a fstab with a few keystrokes,
even on their precious non-z based Linux servers. It also helps to keep a
"cheat sheet" bookmarked for when your stuck.  My go-to page is:

http://linux.about.com/library/cmd/blcmdl1_ed.htm

Martha


On Thu, 22 Sep 2016 13:07:46 -0400 Robert J Brenneman said:
>the /best/ way to edit linux files on 3270 is not to. Plan ahead and make
>backup copies of important config files before making changes and rebooting
>so you can just rename the backup back in place.
>
>but when one must, ed is available. You have to think of it as a typewriter
>though. It is not capable or aware of a terminal that can display multiple
>lines - basically you have a keyboard with no arrow keys, no PF keys, no
>pgup pgdn home end keys to use to talk to ed, and ed is only able to talk
>back to you by spitting out a single line of output at a time with a
>carriage return at the end.
>
>cat / head / tail / sed can also be used to assemble a new file out of an
>existing but broken one.
>
>
>
>--
>Jay Brenneman
>
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Re: Best way to edit Linux files in z/VM 3270

[Tore Agblad]

If the boot process has reach the stadium where vmur is available, you can just 
send files to another Linux, fix it and send it back again.
/Tore

Tore Agblad
Infrastructure Architect – Mainframe zOpen
HCL Technologies Ltd.
DA1S
Gunnar Engellaus väg 3, 418 78 Gothenburg, Sweden 
Direct: +46 31 3233569
Mob: +46 76 5533569
www.hcltech.com
www.hcl.com


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-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Robert J 
Brenneman
Sent: den 22 september 2016 7:08
To: LINUX-390@VM.MARIST.EDU
Subject: Re: Best way to edit Linux files in z/VM 3270

the /best/ way to edit linux files on 3270 is not to. Plan ahead and make
backup copies of important config files before making changes and rebooting
so you can just rename the backup back in place.

but when one must, ed is available. You have to think of it as a typewriter
though. It is not capable or aware of a terminal that can display multiple
lines - basically you have a keyboard with no arrow keys, no PF keys, no
pgup pgdn home end keys to use to talk to ed, and ed is only able to talk
back to you by spitting out a single line of output at a time with a
carriage return at the end.

cat / head / tail / sed can also be used to assemble a new file out of an
existing but broken one.



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Jay Brenneman

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Re: Best way to edit Linux files in z/VM 3270

[Robert J Brenneman]

the /best/ way to edit linux files on 3270 is not to. Plan ahead and make
backup copies of important config files before making changes and rebooting
so you can just rename the backup back in place.

but when one must, ed is available. You have to think of it as a typewriter
though. It is not capable or aware of a terminal that can display multiple
lines - basically you have a keyboard with no arrow keys, no PF keys, no
pgup pgdn home end keys to use to talk to ed, and ed is only able to talk
back to you by spitting out a single line of output at a time with a
carriage return at the end.

cat / head / tail / sed can also be used to assemble a new file out of an
existing but broken one.



--
Jay Brenneman

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Re: Best way to edit Linux files in z/VM 3270

[Berry van Sleeuwen]

Indeed, sed/awk can be used. Or check out the rpl package, but still 
that is just a command to replace strings from the command line, just 
like sed.


The only times I need to use the 3270 console is when the network (ssh) 
is not available. In that case we have the option to shutdown the 
machine, since it's not available to the customer anyway. Then we can 
link/mount the disks in our emergency system and use vi (or whatever 
full-screen editor) from there.


Regards, Berry.

Op 20-09-16 om 21:10 schreef Harley Linker:

The only option that I'm aware of is the 'sed' command.


Harley Linker



-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Diep, 
David (OCTO-Contractor)
Sent: Tuesday, September 20, 2016 2:02 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Best way to edit Linux files in z/VM 3270

Hi everyone,

I've searched everywhere and I cannot find for editing Linux files while logged 
in with 3270. Vi will just get me stuck.  I looked at 'ed', but I get stuck as 
well... any recommendations??

Thanks

David Diep

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Re: Best way to edit Linux files in z/VM 3270

[Bruce Hayden]

Also remember that for ".conf" files that are assigning values to
environment variables, last assignment wins.  So, sometimes I just use
"echo" to append a new value to the file so that I can get the system up.
 (3270 copy and paste also helps input the line.)  Then later on I use vi
to remove the duplicate assignment.

On Tue, Sep 20, 2016 at 2:59 PM, Marcy Cortes  wrote:

> There's just mainly one sed command that i've needed in order to fix
> enough to get the network up.
>
> sed -i -e 's/oldstring/newstring/'  filename
>
> That's generally been enough to get me through say bad IP addresses or
> gateway settings.
>
>
>
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of
> Mark Post
> Sent: Tuesday, September 20, 2016 12:25 PM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: [LINUX-390] Best way to edit Linux files in z/VM 3270
>
> >>> On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)"
> >>> 
> wrote:
> > Hi everyone,
> >
> > I've searched everywhere and I cannot find for editing Linux files
> > while logged in with 3270. Vi will just get me stuck.  I looked at
> > 'ed', but I get stuck as well... any recommendations??
>
> The ed command works fine, but you need to understand how to use it.  It's
> ... different.
>
> I frequently use sed, but if you're at the point where the root file
> system is mounted, you should be able to use the terminal server access.
> This allows you to SSH to the terminal server, then connect to the target
> system and use the normal vi/vim editors.
>
>
> Mark Post
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions, send
> email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
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>



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z/VM and Linux on z Systems ATS
IBM, Endicott, NY

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Re: Best way to edit Linux files in z/VM 3270

[Dave Jones]

I think it's always a good idea to have a Linux terminal server
available for just such instances when you *can't* reach the z/Linux
guest via the network.

There is a short writeup of how to build a terminal server here:

 http://www.vmworkshop.org/docs/2014/24dH6VdP.pdf

Have a good one.

DJ
On 09/20/2016 02:59 PM, Marcy Cortes wrote:

There's just mainly one sed command that i've needed in order to fix enough to 
get the network up.

sed -i -e 's/oldstring/newstring/'  filename

That's generally been enough to get me through say bad IP addresses or gateway 
settings.



-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Mark Post
Sent: Tuesday, September 20, 2016 12:25 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] Best way to edit Linux files in z/VM 3270


On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)"


wrote:

Hi everyone,

I've searched everywhere and I cannot find for editing Linux files
while logged in with 3270. Vi will just get me stuck.  I looked at
'ed', but I get stuck as well... any recommendations??


The ed command works fine, but you need to understand how to use it.  It's ... 
different.

I frequently use sed, but if you're at the point where the root file system is 
mounted, you should be able to use the terminal server access.  This allows you 
to SSH to the terminal server, then connect to the target system and use the 
normal vi/vim editors.


Mark Post

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Re: Best way to edit Linux files in z/VM 3270

[Rick Troth]

Several good responses, perhaps disjoint. Summary at end.


On 09/20/2016 03:35 PM, Michel Beaulieu wrote:
> Are you?
> A) logon to a Linux console, using linemode Linux? 
> or
> B) a CMS users that can access Linux? 
> --
> What kind of files are we talking about:  standard ASCII files or something 
> else. 
> Do we have any translation issues between EBCDIC and ASCII? 
> ---
> Can the files be visible on NFS v3 (that is what z/VM support)?
> OpenVM anyone?
> ---
> Do you have any special need for security/encryption?

This would be high on my list, so I'm quoting Michel: try mounting Linux
filesystems to CMS using the _NFS client built-into OpenVM_. Works well.
Then you get XEDIT. Requires that the Linux guest have network and have
an NFS server. You would then mount selected Linux filesystems to CMS.

Brad mentioned the _SYSASCII console_. Requires CP privs (and HMC
access). Wish it were virtualized (like so that you could SSH to it). I
am sure there are resource constraints which have kept SSH-to-SYSASCII
from being developed because it's an obvious need-to-implement feature.

Rogério suggested IUCV. This is a great idea and doesn't require CP
privs, but does require another Linux guest. SSH to that guest and then
'iucvconn' to the target. Attach point on the target can be kernel space
or user space. (Am leaving out a lot of details.) The _IUCV terminal
service_ is excellent, well tested, highly secure, based on solid
reliable tech.

Like Marcy said, you can probably get by with minimal 'sed' from the
v-console until you have your network back. (This has been my
experience.) Harley also suggested 'sed', but it's not your only option.
(combine that with 'awk' and 'grep'; see below)

Mark mentioned 'ed'. I don't know it and have avoided it just because
memories of 'edlin' aren't all that pleasant. But if one expects to be
in a line-mode context then that's the right tool.

Mauro gave you the power combo: awk, sed, grep. Not CMS Pipelines, but
together they're pretty handy. However, 3270 itself is not the problem.
The line-mode effect is that CP presents the guest with a 3215
typewriter. (keep reading)

Linux /does have/ a _3270 full-screen driver_. 'vi' will display on it.
Input will be difficult. Way more complicated then we want to talk about
here, but fun.

And somehow I don't think I've answered your question, which is the
"best".   :-(

-- R; <><




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Re: Best way to edit Linux files in z/VM 3270

[Brad Hinson]

Another option is the HMC ASCII console:

http://www.ibm.com/support/knowledgecenter/linuxonibm/com.ibm.linux.z.lgdd/lgdd_c_con_access_zvm_hmc.html

Since it's fullscreen it will allow vi as well.

Brad Hinson
Solution Architect, Red Hat
(919) 360-0443

On Tue, Sep 20, 2016 at 2:22 PM, Rogério Soares 
wrote:

> Set  iucv on your servers...  Vi works perfectly!
>
> Em ter, 20 de set de 2016 17:01, Marcy Cortes <
> marcy.d.cor...@wellsfargo.com>
> escreveu:
>
> > There's just mainly one sed command that i've needed in order to fix
> > enough to get the network up.
> >
> > sed -i -e 's/oldstring/newstring/'  filename
> >
> > That's generally been enough to get me through say bad IP addresses or
> > gateway settings.
> >
> >
> >
> > -Original Message-
> > From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of
> > Mark Post
> > Sent: Tuesday, September 20, 2016 12:25 PM
> > To: LINUX-390@VM.MARIST.EDU
> > Subject: Re: [LINUX-390] Best way to edit Linux files in z/VM 3270
> >
> > >>> On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)"
> > >>> 
> > wrote:
> > > Hi everyone,
> > >
> > > I've searched everywhere and I cannot find for editing Linux files
> > > while logged in with 3270. Vi will just get me stuck.  I looked at
> > > 'ed', but I get stuck as well... any recommendations??
> >
> > The ed command works fine, but you need to understand how to use it.
> It's
> > ... different.
> >
> > I frequently use sed, but if you're at the point where the root file
> > system is mounted, you should be able to use the terminal server access.
> > This allows you to SSH to the terminal server, then connect to the target
> > system and use the normal vi/vim editors.
> >
> >
> > Mark Post
> >
> > --
> > For LINUX-390 subscribe / signoff / archive access instructions, send
> > email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> visit
> > http://www.marist.edu/htbin/wlvindex?LINUX-390
> > --
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> http://wiki.linuxvm.org/
> >
> > --
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> >
>
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Re: Best way to edit Linux files in z/VM 3270

[Rogério Soares]

Set  iucv on your servers...  Vi works perfectly!

Em ter, 20 de set de 2016 17:01, Marcy Cortes 
escreveu:

> There's just mainly one sed command that i've needed in order to fix
> enough to get the network up.
>
> sed -i -e 's/oldstring/newstring/'  filename
>
> That's generally been enough to get me through say bad IP addresses or
> gateway settings.
>
>
>
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of
> Mark Post
> Sent: Tuesday, September 20, 2016 12:25 PM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: [LINUX-390] Best way to edit Linux files in z/VM 3270
>
> >>> On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)"
> >>> 
> wrote:
> > Hi everyone,
> >
> > I've searched everywhere and I cannot find for editing Linux files
> > while logged in with 3270. Vi will just get me stuck.  I looked at
> > 'ed', but I get stuck as well... any recommendations??
>
> The ed command works fine, but you need to understand how to use it.  It's
> ... different.
>
> I frequently use sed, but if you're at the point where the root file
> system is mounted, you should be able to use the terminal server access.
> This allows you to SSH to the terminal server, then connect to the target
> system and use the normal vi/vim editors.
>
>
> Mark Post
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions, send
> email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
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>
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>

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Re: Best way to edit Linux files in z/VM 3270

[Marcy Cortes]

There's just mainly one sed command that i've needed in order to fix enough to 
get the network up.

sed -i -e 's/oldstring/newstring/'  filename

That's generally been enough to get me through say bad IP addresses or gateway 
settings.



-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Mark Post
Sent: Tuesday, September 20, 2016 12:25 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] Best way to edit Linux files in z/VM 3270

>>> On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)" 
>>> 
wrote: 
> Hi everyone,
> 
> I've searched everywhere and I cannot find for editing Linux files 
> while logged in with 3270. Vi will just get me stuck.  I looked at 
> 'ed', but I get stuck as well... any recommendations??

The ed command works fine, but you need to understand how to use it.  It's ... 
different.

I frequently use sed, but if you're at the point where the root file system is 
mounted, you should be able to use the terminal server access.  This allows you 
to SSH to the terminal server, then connect to the target system and use the 
normal vi/vim editors.


Mark Post

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Re: Best way to edit Linux files in z/VM 3270

[Michel Beaulieu]

You mentioned in "z/VM" 3270: 

Are you?
A) logon to a Linux console, using linemode Linux? 
or
B) a CMS users that can access Linux? 
--
What kind of files are we talking about:  standard ASCII files or something 
else. 
Do we have any translation issues between EBCDIC and ASCII? 
---
Can the files be visible on NFS v3 (that is what z/VM support)?
OpenVM anyone?
---
Do you have any special need for security/encryption?

Michel Beaulieu
IBM Canada, SSO
/* My opinion expressed here do not engage my employer in any way.  */

> Date: Tue, 20 Sep 2016 16:13:39 -0300
> From: thoriu...@gmail.com
> Subject: Re: Best way to edit Linux files in z/VM 3270
> To: LINUX-390@VM.MARIST.EDU
> 
> There's no "best way", there's only less bad way... 3270 is not a full
> screen terminal, so anything expecting a full screen will get stuck. This
> includes emacs, vi/vim, nano, pine...
> 
> You can use sed, grep and awk. Save a backup copy, use sed/awk combo to
> parse the lines and change whatever is needed. Just beware editing files
> when you need to add/delete the '#' char, it's the default escape char for
> CP.
> 
> Mauro
> http://mauro.limeiratem.com - registered Linux User: 294521
> Scripture is both history, and a love letter from God.
> 
> 2016-09-20 16:01 GMT-03:00 Diep, David (OCTO-Contractor) <david.d...@dc.gov>
> :
> 
> > Hi everyone,
> >
> > I've searched everywhere and I cannot find for editing Linux files while
> > logged in with 3270. Vi will just get me stuck.  I looked at 'ed', but I
> > get stuck as well... any recommendations??
> >
> > Thanks
> >
> > David Diep
> >
> > --
> > For LINUX-390 subscribe / signoff / archive access instructions,
> > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> > visit
> > http://www.marist.edu/htbin/wlvindex?LINUX-390
> > --
> > For more information on Linux on System z, visit
> > http://wiki.linuxvm.org/
> >
> 
> --
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Re: Best way to edit Linux files in z/VM 3270

[Mark Post]

>>> On 9/20/2016 at 03:01 PM, "Diep, David (OCTO-Contractor)" 
>>> 
wrote: 
> Hi everyone,
> 
> I've searched everywhere and I cannot find for editing Linux files while 
> logged in with 3270. Vi will just get me stuck.  I looked at 'ed', but I get 
> stuck as well... any recommendations??

The ed command works fine, but you need to understand how to use it.  It's ... 
different.

I frequently use sed, but if you're at the point where the root file system is 
mounted, you should be able to use the terminal server access.  This allows you 
to SSH to the terminal server, then connect to the target system and use the 
normal vi/vim editors.


Mark Post

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Re: Best way to edit Linux files in z/VM 3270

[Mauro Souza]

There's no "best way", there's only less bad way... 3270 is not a full
screen terminal, so anything expecting a full screen will get stuck. This
includes emacs, vi/vim, nano, pine...

You can use sed, grep and awk. Save a backup copy, use sed/awk combo to
parse the lines and change whatever is needed. Just beware editing files
when you need to add/delete the '#' char, it's the default escape char for
CP.

Mauro
http://mauro.limeiratem.com - registered Linux User: 294521
Scripture is both history, and a love letter from God.

2016-09-20 16:01 GMT-03:00 Diep, David (OCTO-Contractor) 
:

> Hi everyone,
>
> I've searched everywhere and I cannot find for editing Linux files while
> logged in with 3270. Vi will just get me stuck.  I looked at 'ed', but I
> get stuck as well... any recommendations??
>
> Thanks
>
> David Diep
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
> visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
> --
> For more information on Linux on System z, visit
> http://wiki.linuxvm.org/
>

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For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
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http://wiki.linuxvm.org/

Re: Best way to edit Linux files in z/VM 3270

[Harley Linker]

The only option that I'm aware of is the 'sed' command.


Harley Linker



-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Diep, 
David (OCTO-Contractor)
Sent: Tuesday, September 20, 2016 2:02 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Best way to edit Linux files in z/VM 3270

Hi everyone,

I've searched everywhere and I cannot find for editing Linux files while logged 
in with 3270. Vi will just get me stuck.  I looked at 'ed', but I get stuck as 
well... any recommendations??

Thanks

David Diep

--
For LINUX-390 subscribe / signoff / archive access instructions, send email to 
lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
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For more information on Linux on System z, visit http://wiki.linuxvm.org/
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