Ulimit setting for running process in Linux: how to get??

Step 1 :

Determine the Process ID (PID) of the process to be investigated.

#ps -eaf |more

If the PID is unknown then check the  following file to determine the PID:


    * This file should exist if the server is currently running. Exceptional circumstances could lead to a situation where this file exists and the server is not running.

The number contained within this file is the PID of the running server.

Step 2

Once the PID is known, inspect the file at the following location:

Location:     /proc/

File:         limits

    * The contents of this file is similar to the output of the “ulimit -a” command.

This file will have a list of ulimit parameters and their associated values for the specified PID.

Examble :

Limit                     Soft Limit   ...​
​Max cpu time              unlimited ​
​Max file size             unlimited ​
​Max data size             unlimited ​
​Max stack size            10485760  ​
​Max core file size        unlimited ​
​Max processes             unlimited ​
​Max open files            8192      ​

Terminal on EFI : How to configure??

Author : Guna

Problem : HPUX terminal not launching in 11iv3 or the terminal is not correct as per the screen on HPUX 11iv2 on integrity server.

Check the Console mode and change it to Serial from VGA to isntall the OS properly from MP.

To configure the console settings from EFI.


Index Primary Type Device Path

----- ------- ----- ----------

1 S Serial Acpi(HWP0002,PNP0A03,0)/Pci(1

2 P VGA Acpi(HWP0002,PNP0A03,0)/Pci(4

* To change primary operating system console

Shell> conconfig 1 primary

* To disable a console

Shell> conconfig 2 off

Change UUID of the Cloned Disk in linux

If you’ve cloned a disk, such as by using dd, you might want to be able to mount both the original and the clone at the same time. To make sure that the UUIDs don’t clash, first generate a new UUID, and then assign it to the new disk with tunefs:

... 79fb806d-4350-4b8c-8bc3-f3bb0c6b56f2

  #tune2fs -U 79fb806d-4350-4b8c-8bc3-f3bb0c6b56f2 /dev/sdc1

Now mount the new disk:

#mount -U 79fb806d-4350-4b8c-8bc3-f3bb0c6b56f2 /mnt/clonedis

shell script - awk tips

Print column1, column5 and column7 of a data file or output of any columns list
$awk ‘{print $1, $5, $7}’ data_file
$cat file_name |awk ‘{print $1 $5 $7}’
$ls –al |awk ‘{print $1, $5, $7}’ -- Prints file_permissions,size and date
Syntax of running an awk program
Awk ‘program’ input file(s)
List all files names whose file size greater than zero.
$ls –al |awk ‘$5 > 0 {print $9}’
List all files whose file size equal to 512bytes.
$ls –al |awk ‘$5 == 0 {print $9}’
print all lines
$awk ‘{print }’ file_name
$awk ‘{print 0}’ file_name
Number of lines in a file
$awk ‘ END {print NR}’ file_name
Number of columns in each row of a file
$awk ‘ {print NF’} file_name
Sort the output of file and eliminate duplicate rows
$awk ‘{print $1, $5, $7}’ |sort –u
List all file names whose file size is greater than 512bytes and owner is "oracle"
$ls –al |awk ‘$3 == "oracle" && $5 > 512 {print $9}’
List all file names whose owner could be either "oracle" or "root"
$ls –al |awk ‘$3 == "oracle" || $3 == "root" {print $9}’
list all the files whose owner is not "oracle
$ls –al |awk ‘$3 != "oracle" {print $9}’
List all lines which has atlease one or more characters
$awk ‘NF > 0 {print }’ file_name
List all lines longer that 50 characters
$awk ‘length($0) > 50 ‘{print }’ file_name
List first two columns
$awk ‘{print $1, $2}’ file_name
Swap first two columns of a file and print
$awk ‘{temp = $1; $1 = $2; $2 = temp; print }’ file_name
Replace first column as "ORACLE" in a data file
$awk ‘{$1 = "ORACLE"; print }’ data_file
Remove first column values in a data file
$awk ‘{$1 =""; print }’ data_file
Calculate total size of a directory in Mb
$ls –al |awk ‘{total +=$5};END {print "Total size: " total/1024/1024 " Mb"}’
Calculate total size of a directory including sub directories in Mb
$ls –lR |awk ‘{total +=$5};END {print "Total size: " total/1024/1024 " Mb"}’
Find largest file in a directory including sub directories
$ls –lR |awk ‘{print $5 "\t" $9}’ |sort –n |tail -1


Power path installation on hp-ux for load balancing

To install power path :
#swinstall -x autoreboot=true -x mount_all_filesystems=false -s /tmp/EMCPower.HP.4.1.0.tar EMCpower

#emcpreg -install   (#Enter registration key)

#powermt config

#powermt set policy=so dev=all

# powermt display

 Run powervadm list to confirm unique volume group naming and storage elements do not belong to any other PPVG volume group on the host.

#powervadm list

 To create VG & lvol :
#powervg create -vg oracle10g -se c22t0d0 c22t0d1 c22t0d2 –continue

#powervol create -vg oracle10g -vol ora100gbr5v08 -ua -se c24t1d0

To view volume group information

#powervadm [list|show]

#powervadm show -tab

To view information about a specific volume group
#powervg [list|show] –vg volumename –vol

#powervg [list|show] –vg volumename –se

The -vol and the -se arguments are mutually exclusive.

Backup metadata
#powervmeta backup -vg oracle10g -f /tmp/oracle10g_metadata.81390

Destory Volumes and Volume Groups run the following commands

#powervol destroy –vg oracle10g –vol ora22gbr1v01

#powervg destroy –vg oracle10g

Disable root SSH login : How to ??

Disable Root SSH Login on HP UX

# cd /opt/ssh/etc

# vi sshd_config

Change the line:

PermitRootLogin yes

change into like below

PermitRootLogin no

save and exit

Then stop and restart SSH.

# /sbin/init.d/secsh stop

# /sbin/init.d/secsh start

You will then NOT be allowed to ssh as root.


Disable Root SSH Login on Linux

 #vi /etc/ssh/sshd_config

Find this section in the file, containing the line with “PermitRootLogin” in it.

    #LoginGraceTime 2m
    #PermitRootLogin no
    #StrictModes yes
    #MaxAuthTries 6

Make the line look like this to disable logging in through ssh as root.

    PermitRootLogin no

Then  restart the sshd service:

   # /etc/init.d/sshd restart

Blogger Tips and TricksLatest Tips And TricksBlogger Tricks