Thiagu Mohan's Blog

2021-12-20T11:43:00.004+05:30

Error

dasm: asm/opazcns0.asm line 147:DASM144E Begin-to-continue columns not blank

dasm: asm/opazcns0.asm line 147:DASM063E No ending apostrophe

dasm: asm/opazcns0.asm line 147:DASM435I Record 147 in asm/opbzcns0.asm

Solution -

This is applicable for assembler code and Aix platforms ( I tried in ZOS(OS390) and Aix platforms)

File named asm/opazcns0.asm is having characters of more than 71 in a single line which is not allowed.

In other words there cannot be a character in column 72 for line number 147

How to find the parent between two Git branches

2021-12-20T11:30:00.003+05:30

In Git everything is a commit with a description. So you can find the latest common commit between two branches with git merge-base

git merge-base bug-1234 dev/project

7acf13c1390e451f721b3ae6779e8fca8f737b12

it will list the latest common commit between both the branches. i.e after this particular commit branch bug-1234 is branched out

Not able to login Jenkins ? Locked yourself by messing security ? How to disable security in Jenkins

2013-12-18T16:07:00.001+05:30

Rarely we end up locking ourself in jenkins so that we couln't login Jenkins.

For example -

If you enable security before creating an account, you end up being access denied with out any login account in hand.

Jenkins throws error like

javax.servlet.ServletException: hudson.security.AccessDeniedException2: anonymous is missing the Overall/Administer permission

This can be solved by editing the config.xml and disabling the security by changing

<useSecurity>true</useSecurity>
into
<useSecurity>false</useSecurity>

You can refer this url from Jenkins - https://wiki.jenkins-ci.org/display/JENKINS/Disable+security

How to Fix error 'Could not determine the server's fully qualified domain name, using 127.0.0.1 '

2013-12-13T19:07:00.002+05:30

Problem:

[root@spa ~]# service httpd start
Starting httpd: httpd: Could not determine the server's fully qualified domain name, using 127.0.0.1 for S erverName
[ OK ]
[root@spa ~]#

solution:

Edit /etc/httpd/conf/httpd.conf
and search for ServerName and add
ServerName localhost

How to reset passwords in perforce

2013-12-13T19:05:00.001+05:30

From time to time, it is inevitable that users will forget Perforce passwords. A Perforce superuser can set a new password for any user with:

    Release 99.1 and later:

        p4 passwd username

    (Perforce will prompt the superuser for a new password for user username.)

C:\Users\mohan>p4 passwd thangam
Enter new password:
Re-enter new password:
Password updated.

How to delete the changelist and workspace of another user ( clean ex-employee workspace to reclaim space and license )

2013-12-13T19:03:00.001+05:30

this will give you the pending changes on the client

p4 changes -c user_workspace

this will delete the pending change list of your choice

p4 change -d

after that, you can delete the client using

p4 client -d user_workspace

How to overwrite symbolic links in unix

2013-12-13T19:00:00.002+05:30

You can overwrite symbolic links by using -f to the default command

Example
mohan@mysys /cygdrive/c/
$ ln -s /tmp/test.sh tumba
mohan@mysys /cygdrive/c/
$ ls -l
total 80
lrwxrwxrwx 1 mohan Domain Users 5 Oct 9 14:59 tumba -> /tmp/test.sh
mohan@mysys /cygdrive/c/
$ ln -s /tmp/build_env.log tumba
ln: failed to create symbolic link `tumba': File exists
mohan@mysys /cygdrive/c/

Now we can overwrite the existing symbolic link by using -f

$ ln -s -f /tmp/build_env.log tumba
mohan@mysys /cygdrive/c/
$ ls -l
total 80
lrwxrwxrwx 1 mohan Domain Users 5 Oct 9 14:59 tumba -> /tmp/build_env.log

How to fix perforce error 'Some file(s) could not be transferred from client.'

2013-12-13T18:56:00.003+05:30

Problem:
open for read: c:\p4\client_spec.txt: The system cannot find the file specified.
Submit aborted -- fix problems then use 'p4 submit -c 1347493'.
Some file(s) could not be transferred from client.

Cause:
When you try to open a file which does not exist in perforce, it gives above error. First do a p4 add, and then open it.

How to change the binary name from the defalut name setup.exe in Installshield

2013-12-13T18:53:00.001+05:30

installshield - change setup.exe name
release tab-> product configureation -> setup file name(change)

Specify the file name—without the .exe file extension—that InstallShield should use
for the setup launcher file that it generates at build time. If this setting is blank,
InstallShield uses the default value of Setup, and the setup launcher file is called
Setup.exe.

how to format FAT 16 in windows 7

2013-12-13T18:51:00.002+05:30

C:\Users\mohan>format G: /FS:FAT /A:16K
Insert new disk for drive G:
and press ENTER when ready...
The type of the file system is FAT.
Verifying 3835M
The specified cluster size is too small for FAT16/12.

How to Unmount an ISO in linux

2013-12-13T18:36:00.002+05:30

To see the list of currently mounted file systems,

#mount

To unmount a mounted iso,

# umount /mnt/iso

assuming that your image is mounted at /mnt/iso

How to mount ISO in Linux using command line

2013-12-13T18:32:00.003+05:30

Procedure to mount ISO images under Linux

As Root

1)Create some directory to mount the iso so that you can view it as a regular directory.

             # mkdir -p /mnt/disk

2) Use mount command as follows to mount iso file called disk1.iso:

             # mount -o loop disk1.iso /mnt/disk

Now to see the contents of iso file, Change directory to list files stored inside an ISO image:
            # cd /mnt/disk
            # ls -l

More about loop device

A loop device is a pseudo-device that makes a file accessible as a block device. Loop devices are often used for CD ISO images and floppy disc images. Mounting a file containing a filesystem via such a loop mount makes the files within that filesystem accessible. They appear in the mount point directory using above commands.

how to add files under apache server

2013-12-13T18:28:00.002+05:30

In Apache server, add your contents under a directory and create symlink to it under /var/www/html/

or

move your directory under /var/www/html/

How to send mail in linux

2013-12-13T18:26:00.003+05:30

mail -s "Hello world" mohan@yahoo.com

Use Control+D to move next item

Execution Failed: "/bin/vi" ".\t1636t37.tmp": The system cannot find the path specified.

2013-12-13T18:23:00.005+05:30

Problem:
Execution Failed: "/bin/vi" ".\t1636t37.tmp": The system cannot find the path specified.

Cause:
you are trying to do a p4 edit in cgywin, where p4 is pointing to the windows version c:\program files\p4.exe so its trying to open textfile in vi using windows p4.exe. Change the default p4 pointing to the cygwinversion and try.

How to check whats running in the perforce server or How to monitor perforce server

2013-12-13T18:18:00.003+05:30

Like the 'top' command in Linux which helps us to see what process and commands are running in the system, perforce has 'monitor' command to list the operations running in its system.

It lists the users and their commands currently running in the perforce server

Example -

mohan@vmlinux/cygdrive/c/p4_mohan/user_informatio
5.0/output
# p4 monitor show
7097 R mohan    00:00:00 monitor
7098 R rama       00:00:00 labels
7099 R arus    00:00:00 spec
28435 R perforce   00:30:31 verify

Could not connect to perforce. error 'It is possible that someone is intercepting your connection to the Perforce P4PORT '10.31.64.101:1888''

2013-12-13T18:12:00.000+05:30

Error Message:

[mohan@spl ~]$ p4 info
******* WARNING P4PORT IDENTIFICATION HAS CHANGED! *******
It is possible that someone is intercepting your connection
to the Perforce P4PORT '10.11.64.101:1888'
If this is not a scheduled key change, then you should contact
your Perforce administrator.
The fingerprint for the mismatched key sent to your client is8A:BE:F1:B9:DC:E3:50:D1:16:D6:6D:66:BB:AE:0B:26:86:C0:60:DC
To allow connection use the 'p4 trust' command.

Reason:
This happens due to environmental changes like change of ip or mac address etc. It makes the established and stored fingerprint to mismatch. So you have to reestablish the 'trust' with the server again. so we will not be able to run any command.

You have to do this by issuing 'p4 trust -f'

[build@splash ~]$ p4 trust -f
******* WARNING P4PORT IDENTIFICATION HAS CHANGED! *******
It is possible that someone is intercepting your connection
to the Perforce P4PORT '10.11.64.101:1888'
If this is not a scheduled key change, then you should contact
your Perforce administrator.
The fingerprint for the mismatched key sent to your client is8A:BE:F1:B9:DC:E3:50:D1:16:D6:6D:66:BB:AE:0B:26:86:C0:60:DC
Are you sure you want to establish trust (yes/no)? yes
Added trust for P4PORT 'ssl:p4pserver.cmp.com:1888' (10.11.64.101:1888)

Now you can try some p4 commands to verify.

how can I find out the "source" changelist of the newly created branch in perforce?

2013-12-13T18:02:00.000+05:30

To see details on source of branch integrated in perforce

After branching from base branch to a new branch, can we find the changelist at which the branch is created from source branch?

You can find it by using the below command with the new branch ( the child branch for whom you are interested to see the history)

p4 changes -i //depot/child_branch

This will list the changes of this branch followed by the changes happened in its parent branch. By describing the changes you can get the particular parent branch name.

Syntax for p4 describe

p4 describe <changelist number>

example-
$ p4 describe 1129671
Change 7129671 by ravis1@project on 2010/06/29 06:51:50

starting tomcat using "start startup.bat" command

Affected files ...

... //dev/env/atia/eventrepository/install/install.bat#11 edit
... //dev/env/atia/eventrepository/readme.txt#6 edit

How to fix Perforce error "Can't clobber writable file"

2013-11-30T17:08:00.001+05:30

Perforce throwing below error while trying to remove folder from workspace

Error:
Can't clobber writable file C:\thiagu\Perforce\thiagu_p4server.net_1333\dev-app\Application.Properties

Solution:
when you try to sync a file, perforce expects your files in workspace will have read-only permissions. But if a file is not checkout,(by p4 edit)but has write permission then it will throw the above error. Changing the file to read-only and syncing again will solve the issue. or try removing the workspace and get the latest revision again

WSAECONNREFUSED (10061) - Connection refused.

2013-07-29T23:44:00.000+05:30

Problem:
Connect to server failed; check $P4PORT.
connect: 10.31.64.101:1888: WSAECONNREFUSED

Cause & Solution:

This problem occurs when you are trying to connect to a server which is not running. May be the network in-between lost, or perforce must be down due to some reason etc.

check whether the port is running and restart perforce server if needed

[root@p4proxyserver4 ~]# netstat -na | grep 1444
tcp 0 0 10.27.60.103:1444 0.0.0.0:* LISTEN

In my case it happened that the proxy server which i was trying to connect, could not connect to the main server which is recently restarted. So once i restarted the proxy server, i was able to connect to the proxy perforce server fine.

For detailed and related information refer below URL
http://answers.perforce.com/articles/KB_Article/Common-Windows-Server-Network-Errors

How to abort shutdown scheduled in windows

2013-07-11T23:09:00.001+05:30

You may know that we can schedule a shutdown or hibernate after some time by

shutdown /s /t 3600

In case if you want to cancel it, you can do that by below command,

shutdown /a

For your reference, the complete help details of shutdown command listed below,

C:\Users\mohan>shutdown /?
Usage: shutdown [/i | /l | /s | /r | /g | /a | /p | /h | /e] [/f]
    [/m \\computer][/t xxx][/d [p|u:]xx:yy [/c "comment"]]

    No args    Display help. This is the same as typing /?.
    /?         Display help. This is the same as not typing any options.
    /i         Display the graphical user interface (GUI).
               This must be the first option.
    /l         Log off. This cannot be used with /m or /d options.
    /s         Shutdown the computer.
    /r         Shutdown and restart the computer.
    /g         Shutdown and restart the computer. After the system is
               rebooted, restart any registered applications.
    /a         Abort a system shutdown.
               This can only be used during the time-out period.
    /p         Turn off the local computer with no time-out or warning.
               Can be used with /d and /f options.
    /h         Hibernate the local computer.
               Can be used with the /f option.
    /e         Document the reason for an unexpected shutdown of a computer.
    /m \\computer Specify the target computer.
    /t xxx     Set the time-out period before shutdown to xxx seconds.
               The valid range is 0-315360000 (10 years), with a default of 30.
               If the timeout period is greater than 0, the /f parameter is
               implied.
    /c "comment" Comment on the reason for the restart or shutdown.
               Maximum of 512 characters allowed.
    /f         Force running applications to close without forewarning users.
               The /f parameter is implied when a value greater than 0 is
               specified for the /t parameter.
    /d [p|u:]xx:yy Provide the reason for the restart or shutdown.
               p indicates that the restart or shutdown is planned.
               u indicates that the reason is user defined.
               If neither p nor u is specified the restart or shutdown is
               unplanned.
               xx is the major reason number (positive integer less than 256).
               yy is the minor reason number (positive integer less than 65536).

Reasons on this computer:
(E = Expected U = Unexpected P = planned, C = customer defined)
Type    Major   Minor   Title

U      0       0       Other (Unplanned)
E       0       0       Other (Unplanned)
E P     0       0       Other (Planned)
U      0       5       Other Failure: System Unresponsive
E       1       1       Hardware: Maintenance (Unplanned)
E P     1       1       Hardware: Maintenance (Planned)
E       1       2       Hardware: Installation (Unplanned)
E P     1       2       Hardware: Installation (Planned)
E       2       2       Operating System: Recovery (Planned)
E P     2       2       Operating System: Recovery (Planned)
P     2       3       Operating System: Upgrade (Planned)
E       2       4       Operating System: Reconfiguration (Unplanned)
E P     2       4       Operating System: Reconfiguration (Planned)
P     2       16      Operating System: Service pack (Planned)
        2       17      Operating System: Hot fix (Unplanned)
P     2       17      Operating System: Hot fix (Planned)
        2       18      Operating System: Security fix (Unplanned)
P     2       18      Operating System: Security fix (Planned)
E       4       1       Application: Maintenance (Unplanned)
E P     4       1       Application: Maintenance (Planned)
E P     4       2       Application: Installation (Planned)
E       4       5       Application: Unresponsive
E       4       6       Application: Unstable
U      5       15      System Failure: Stop error
U      5       19      Security issue
E       5       19      Security issue
E P     5       19      Security issue
E       5       20      Loss of network connectivity (Unplanned)
U      6       11      Power Failure: Cord Unplugged
U      6       12      Power Failure: Environment
P     7       0       Legacy API shutdown

error C4335: Mac file format detected: please convert the source file to either DOS or UNIX format

2013-04-17T10:00:00.000+05:30

Problem:
error C4335: Mac file format detected: please convert the source file to either DOS or UNIX format

Solution:
if you are compiling in cygwin or unix\linux you can apply dos2uinx on files to remove this issue.

mohan@MOHANTL1C ~
$ dos2unix.exe test.txt
dos2unix: converting file test.txt to Unix format ...

How to change password in perforce

2013-03-01T10:00:00.000+05:30

You can change your password in perforce using p4 cmd 'passwd'. This is same in windows\Linux. Example given below.

C:\Users\mohan>p4 passwd
Enter old password:
Enter new password:
Re-enter new password:
Password updated.

How to find a system 32 or 64 bit

2013-02-26T10:00:00.000+05:30

In any Linux variants either one of this should work ( Redhat, Cent-Os, Ubuntu, Hp-ux, Solaris etc )

[mohan@chinna ~]$ arch
x86_64
[mohan@chinna ~]$ uname -m
x86_64
[mohan@chinna ~]$ getconf LONG_BIT
64

As you can guess, 64 / x86_64 is 64bit system, whereas 32 / i386 / i686 denotes its a 32 bit sytem.

For windows
Right-click MyComputer->Properties

It will bring a window like below image, from that you can check the system type

How to edit iptables in linux

2013-02-25T10:00:00.000+05:30

Problem:
sometimes you may receive below error like

The description for Event ID ( 0 ) in Source ( sshd ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: sshd: PID 2992: Accepted publickey for build from 10.69.250.31 port 33344 ssh2.

Solution :
Either Turn off the firewall in linux or add the port 22 as exception in iptables

To disable selinux edit /etc/sysconfig/selinux and set SELINUX to disabled.

SELINUX=disabled

I've encountered such problems when the binaries and libraries were not
executable by SYSTEM.
"chmod 755 /usr/sbin/* /usr/bin/*" fixed the problem.

If the problem still exists, add the port to the iptables.

For adding port 22 to the iptables, from shell run

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

or

edit /etc/sysconfig/iptables
and append this line

-A INPUT -p tcp --dport 22 -j ACCEPT
Save and close the file. Restart iptables:
/etc/init.d/iptables restart
or
service iptables restart
Learn more about iptables by
man iptables