new bie questions

gauri · 02-09-2006, 12:52 AM

Hi all,

I am a new bie and learning linux step by step. I am googling a lot but still unabel to find few things like below:

1. how to clean ipcs if I reboot the system it is cleaned but can I do that with out rebooting the system
2. I don’t have any in side the folder /usr/src and one of my auto script is expecting the following file
/usr/src/linux-2.6.10

Could any one can help me.

Thanks & Regards
Gauri

kloss · 02-09-2006, 02:48 AM

1. ?
2. I think you should install the kernel headers.

++

nx5000 · 02-09-2006, 05:24 AM

1. Use ipcrm:

Code:

 #!/bin/csh -f
#system cleanup for LINUX
foreach i (`ipcs -m | tail +4 | awk '{print $2}'`)
    ipcrm shm $i
end
foreach i (`ipcs -s | tail +4 | awk '{print $2}'`)
    ipcrm sem $i
end

2. ?

gauri · 02-14-2006, 06:13 AM

Hi,

Can you please expalin me this script.

Thanks & Regards
Gauri

Quote:

Originally Posted by nx5000

1. Use ipcrm:

Code:

 #!/bin/csh -f
#system cleanup for LINUX
foreach i (`ipcs -m | tail +4 | awk '{print $2}'`)
    ipcrm shm $i
end
foreach i (`ipcs -s | tail +4 | awk '{print $2}'`)
    ipcrm sem $i
end

2. ?

nx5000 · 02-14-2006, 09:11 AM

Sure

Step by step:

Code:

ipcs -m

Gives a human friendly list of shared memory on your system:
gives this on my box at the moment:

Quote:

user@debian:/xfs/tool/own$ ipcs -m

------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 57573377 user 600 196608 2 dest
0x00000000 57606146 user 600 393216 2 dest
0x00000000 75694083 user 600 393216 2 dest
0x00000000 75726852 user 600 196608 2 dest

First we need to remove the first empty lines and the header (Shared Memory Segments, key shmid owner,..)

Code:

ipcs -m | tail +4

This gives :

Quote:

0x00000000 57573377 user 600 196608 2 dest
0x00000000 57606146 user 600 393216 2 dest
0x00000000 75694083 user 600 393216 2 dest
0x00000000 75726852 user 600 196608 2 dest

Then we know that to remove an ipcs we can use ipcrm but that this program wants to ipcs id as argument. So we have to extract column 2:

Code:

ipcs -m | tail +4 | awk '{print $2}'

This gives :

Quote:

57573377
57606146
75694083
75726852

And then we make a loop on these id and we pass it to ipcrm.
ipcrm shm $i for shared memory.

The same for semaphores and messages.

gauri · 02-15-2006, 01:04 AM

Thanks a lot. I was not getting what this tail is doing here actually.

Thanks for replying for such small doubt.

Regards
Gauri

Quote:

Originally Posted by nx5000

Sure

Step by step:

Code:

ipcs -m

Gives a human friendly list of shared memory on your system:
gives this on my box at the moment:

First we need to remove the first empty lines and the header (Shared Memory Segments, key shmid owner,..)

Code:

ipcs -m | tail +4

This gives :

Then we know that to remove an ipcs we can use ipcrm but that this program wants to ipcs id as argument. So we have to extract column 2:

Code:

ipcs -m | tail +4 | awk '{print $2}'

This gives :

And then we make a loop on these id and we pass it to ipcrm.
ipcrm shm $i for shared memory.

The same for semaphores and messages.