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 Forum index » House Training » Beginners Help ( Start Here)
Basic Shell (Console) operation for beginners
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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Fri 24 Jun 2011, 05:58    Post_subject:  
Thanks Mick,

got it. Nice to see you here.

Rolf
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Bruce B


Joined: 18 May 2005
Posts: 10823
Location: The Peoples Republic of California
PostPosted: Fri 24 Jun 2011, 08:00    Post_subject:  
rhadon wrote:
If I can't solve this for me, is it OK to post such questions here (maybe initrd isn't so interesting for others here) or should I post in a separate thread, maybe in Users ( For the regulars )?


Rhadon,

This is why I think couldn't follow. I did what you apparently want to do, and I used a different approach.

I you want to work on this together, please specify exactly what you want and we'll give it a try. But patience, it could take a few days between breaks and all.

Bruce

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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Fri 24 Jun 2011, 12:31    Post_subject:  
Ok Bruce,

here is what I have:

Code:
#!/bin/sh
PSUBDIR="/lupu-525"      #given by init script
ONEPART="sda2"         #given by init script

ls /mnt/home/$PSUBDIR/boot-savefile>/dev/null
if [ "$?" = "0" ]
then
   TST1=`grep "time=" /mnt/home/$PSUBDIR/boot-savefile | cut -f 2 -d '='`
   TST2=`grep "default=" /mnt/home/$PSUBDIR/boot-savefile | cut -f 2 -d '='`
   echo "Savefile #" $TST2 "will start automatically in " $TST1 "seconds." # in init script >/dev/console must be added
   read -t $TST1 NUMSAVE
   [ -z "$NUMSAVE" ] && NUMSAVE=$TST2   
else
   read NUMSAVE         # this is the original place during boot where to select the savefile, ~ line#782 in init script
fi
echo "NUMSAVE="$NUMSAVE      # for testing


This works fine as a stand alone script. It fails in init script.. OK, it is clear, that /mnt/home/ doesn't work.

My first thought, if initrd is loading, I have access to PSUBDIR and everything is fine. Nice dream. Laughing

At this point of the init script it seems to me that nothing is mounted.
#mount gives nothing back. With #ls I can see that I'm in the init-tree.

My idea was/is to mount $ONEPART (here sda2), searching for boot-savefile in $PSUBDIR and to umount it later.
The way I know, #mount /dev/$ONEPART /mnt/$ONEPART doesn't work.

In the README.txt I find:
Code:
/initrd/pup_rw
This is the writable folder. Usually it is tmpfs (temporary filesystem) in ram.
However, a personal storage file (named "pup_save.2fs" or similar) or partition
could be mounted directly on here (in which case it won't be on /initrd/pup_ro1).

So this seems to be the right place to mount sda2 temporarily. But how? All commands in ini about mounting are looking so complicated, I don't understand.

At ~line 176 there's a function called mntfunc(). I assume, most mounting will be done with this function. It seems to check for different file systems. Maybe a better solution than trying myself?

For now I think I must at least specify more, like file system (here ext3) .

What do you think? Is it a workable way?

Opinions from others are also appreciated. Wink

Rolf
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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Sat 25 Jun 2011, 04:43    Post_subject:  
Hi,

IT WORKS Very Happy Very Happy Laughing

Code:
    TST3=`echo $PUPSFS | cut -d , -f 2`
   mntfunc $TST3 /dev/$PDEV1 /mnt/dev_ro2
   ls /mnt/dev_ro2$PSUBDIR/boot-savefile >/dev/null
   if [ "$?" = "0" ]
   then
      TST1=$(grep "time=" /mnt/dev_ro2$PSUBDIR/boot-savefile | cut -f 2 -d '=')
      TST2=$(grep "default=" /mnt/dev_ro2$PSUBDIR/boot-savefile | cut -f 2 -d '=')
      echo "If no input +[ENTER], savefile #" $TST2 "will start automatically in " $TST1 "seconds." >dev/console
      umntfunc /mnt/dev_ro2
      read -t $TST1 NUMSAVE
      [ -z "$NUMSAVE" ] && NUMSAVE=$TST2
   else
      umntfunc /mnt/dev_ro2
      echo "To start automatically you can use a textfile named boot-savefile" >/dev/console
      echo "with time=n and default=n in PSUBDIR" >/dev/console
      read NUMSAVE
   fi


If you replace the original line read NUMSAVE in the init script (in Lupu-525 it's line #782) with the complete code above, you should be able to use a textfile named boot-save to boot automatically one of your savefiles or pfix=ram.

boot-savefile (in PSUBDIR) contains only
Code:
time=n
default=n
Replace n with your desired values.

It works for frugal installs on HD and with PSUBDIR.
I don't think it works from CD or without using a subdirectory (now).

I like to hear, what I could do better. Wink

Rolf

Edit:
Just tested a little bit more, it seems to work also fine with Icepuppy-013 and Spup-120.50 but not (now) with Puppy 4.31 or Puppy 4.20. The boot-savefile will not be detected.
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Edited_time_total
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DaveS


Joined: 09 Oct 2008
Posts: 3695
Location: UK
PostPosted: Sat 25 Jun 2011, 11:42    Post_subject:  
Replace read NUMSAVE with read boot-save?
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Bruce B


Joined: 18 May 2005
Posts: 10823
Location: The Peoples Republic of California
PostPosted: Sat 25 Jun 2011, 12:03    Post_subject:  
Rolf,

I guess you have it fixed. Nice feeling of satisfaction huh?

Init is a file Barry has been working on and improving for years. I find it fascinating because it reveals how Puppy is so versatile.

Congratulations

Bruce

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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Sat 25 Jun 2011, 13:27    Post_subject:  
DaveS wrote:
Replace read NUMSAVE with read boot-save?
Sorry for being not clear. I've edited my post.

You need to replace read NUMSAVE with the complete code above. It's looking for the boot-savefile and if it's not available, you can select as usual.

Just tested a little bit more, it seems to work also fine with Icepuppy-013 and Spup-120.50 but not (now) with Puppy 4.31 or Puppy 4.20. The boot-savefile will not be detected.

Another bug:
I've had Puppy 4.31 on sda2 and sda10 (the same name of psubdir). Booting from sda10 with Grub, initrd finds only the pupsave files from sda2 and boot from there.
Edit: Seems to be bug in the initscript of 4.31 itself and has nothing to do with my changes. Smile

@Bruce,

Thanks again. Yes it's a great feeling Very Happy , but high and low is very close Rolling Eyes It's a big step for me but far away from being sophisticated.

Rolf
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Bruce B


Joined: 18 May 2005
Posts: 10823
Location: The Peoples Republic of California
PostPosted: Sun 26 Jun 2011, 09:17    Post_subject:  
Rolf

Something like this, but this init is from Lupu 5.20

Quote:
PCPARTSALL="`probepart_init -k`"


Run probepart_init -k to see how it formats

Then for the value is the output for /sda10

In other words, you no longer run probepart for that install. Init thinks there is only one partition to search

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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Mon 27 Jun 2011, 16:53    Post_subject:  
Thanks Bruce,

I appreciate your help.

Maybe it will take some days till I test, because I was running in serious problems and for now I have only 2 partitions.

I tried to get Lupu-525 running on sda6 with raiserfs. It worked. So I tried to get a savefile.rfs running.

Then I made some faults, I really should have known better.

Well, I have back my 2 main partitions, sda1 and sda2. All what I now really miss is one file (~7GB) which was on sda9. Maybe I must create new Partitions and restore this file with an old one, but if I do so, I have no more chance to restore the actual one. Will try it with testdisk again.

Rolf
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Aitch


Joined: 04 Apr 2007
Posts: 6825
Location: Chatham, Kent, UK
PostPosted: Wed 29 Jun 2011, 14:41    Post_subject:  
long thread, ....so these may have been posted already....

http://www.pixelbeat.org/cmdline.html#monitor

http://www.pixelbeat.org/docs/linux_commands.html

http://linuxcommand.org/index.php

http://www.linuxguide.it/linux_commands_line_en.htm

and, of course

http://puppylinux.org/wikka/BASH

Aitch Smile
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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Tue 05 Jul 2011, 13:11    Post_subject:  
@ Bruce
Thanks again mate.

After playing with probepart_init, I found an older explanation from you here.

So I tested "PDEF1=sda8" in my menu.lst (that's my actual 2nd partition with PSUBDIR=lupu-525) and it works fine.

Rolf
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Bruce B


Joined: 18 May 2005
Posts: 10823
Location: The Peoples Republic of California
PostPosted: Fri 08 Jul 2011, 01:28    Post_subject:  
rhadon wrote:
So I tested "PDEF1=sda8"


May I accept PDEF1=sda8 as a typo meaning to say PDEV1=sda8 ?

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rhadon


Joined: 27 Mar 2008
Posts: 1228
Location: Germany
PostPosted: Fri 08 Jul 2011, 03:54    Post_subject:  
Bruce B wrote:
May I accept PDEF1=sda8 as a typo meaning to say PDEV1=sda8 ?
Yes. Embarassed

Rolf
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Shep

Joined: 08 Nov 2008
Posts: 840
Location: GIRT-BY-SEA
PostPosted: Sat 08 Oct 2011, 01:38    Post_subject:  
Very quiet in here ....

I'm trying to store a newline character in a shell variable, e.g.,

C=$(printf "a\nb")
printf "$C" | od -c

Works as expected, and stores the 3 characters.

But if I delete the b, to store just 2 characters, it also drops the \n and stores just one character. Why is this? Question Question

How to make it store a trailing newline? (EDIT: solved: C=$(printf "a\\\nb")

I know about
C='
'
but I'd like to make the printf method work.
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grump

Joined: 10 Oct 2011
Posts: 67
Location: Melbourne, Oz
PostPosted: Sun 23 Oct 2011, 20:05    Post_subject:  
All this makes my head hurt. I think you (meaning the main contributors to this thread) vastly over-estimate the abilities of a 'beginner', unless you think of a 'beginner' as a person who is already an experienced coder in other languages.

For example the 1st bit of code in this thread:

Code:
# for i in `ls *.deb`; do undeb $i; shift; done

has at least 3 programming concepts that would be meaningless to the average true 'beginner'.

However, the thread contains lots of good stuff for experienced ppl!
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