Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Not able to delete log file
Operating Systems Solaris Not able to delete log file Post 302865195 by Don Cragun on Thursday 17th of October 2013 11:26:43 PM
Old 10-18-2013
The commands:
Code:
>soa.out
>admin.out

deallocate all blocks allocated to those files at that time, but it doesn't close the file descriptors and does not reset the file offset that determines the position in the file where the next data written will be placed by in the processes that are writing to those files.

The next time the process writes something to one of those files, it will write it to the spot in the file just after the last place it wrote into that file. That will not allocate any disk blocks for the bytes in the file you previously deallocated, so what you end up with is known as a holey file which contains unallocated blocks that have never been written. If you try to read data from those blocks (such as by running cat soa.out), those unallocated blocks will appear as though null bytes had been written into those bytes.

If you change the program(s) that are writing those log files to add the O_APPEND flag to the oflag argument to the call to open() that opens the log files, it will reset the position in the log file where it writes data to the current end of file every time it writes to the log file. So, if you clear the log file using >logfile, the next write to the log file will be at the start of the file instead of leaving a huge hole at the start of the file.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

mass delete a certain string in a .log file

Hey all. I have a file that has roughly 115,000 lines in it. There are a few lines of information that I don't want in it, but I don't want to search through all of the lines to find the ones that I don't want. Is there a way to do a mass delete of the lines that I don't want? Thanks for the... (4 Replies)
Discussion started by: jalge2
4 Replies

2. Shell Programming and Scripting

how to delete blank rows in a log file

Help How to delete all blank rows in log file (4 Replies)
Discussion started by: suryanarayana
4 Replies

3. Shell Programming and Scripting

Delete lines prior to a specific date in a log file.

Hi all. I have a database log file in which log data get appended to it daily. I want to do a automatic maintainence of this log by going through the log and deleting lines belonging to a certain date. How should i do it? Please help. Thanks. Example. To delete all lines prior to Jun... (4 Replies)
Discussion started by: ahSher
4 Replies

4. Shell Programming and Scripting

Delete log file entries based on the Date/Timestamp within log file

If a log file is in the following format 28-Jul-10 ::: Log message 28-Jul-10 ::: Log message 29-Jul-10 ::: Log message 30-Jul-10 ::: Log message 31-Jul-10 ::: Log message 31-Jul-10 ::: Log message 1-Aug-10 ::: Log message 1-Aug-10 ::: Log message 2-Aug-10 ::: Log message 2-Aug-10 :::... (3 Replies)
Discussion started by: vikram3.r
3 Replies

5. Shell Programming and Scripting

Log file - Delete lines

Hello, I tried to search on the site a way to delete lines on log files but I didn't find what I am looking for... I hope someone will be able to help me. I do not know how to explain this, so I will do my best. I have a log file and I want to delete all second lines. Example : ... (3 Replies)
Discussion started by: Aswex
3 Replies

6. Shell Programming and Scripting

Delete log files content older than 30 days and append the lastest date log file date

To delete log files content older than 30 days and append the lastest date log file date in the respective logs I want to write a shell script that deletes all log files content older than 30 days and append the lastest log file date in the respective logs This is my script cd... (2 Replies)
Discussion started by: sreekumarhari
2 Replies

7. Red Hat

Need Script to ZIP/SAVE & then DELETE Log file & DELETE ZIPS older than 12 months

ENVIROMENT Linux: Fedora Core release 1 (Yarrow) iPlanet: iPlanet-WebServer-Enterprise/6.0SP1 Log Path: /usr/iplanet/servers/https-company/logs I have iPlanet log rotation enabled rotating files on a daily basis. The rotated logs are NOT compressed & are taking up too much space. I... (7 Replies)
Discussion started by: zachs
7 Replies

8. Shell Programming and Scripting

Delete all files from the directory except the ones in the log file

I have a log file with contents like below. Repository: https://someserver:9443/ Workspace: (1000) "test_scripts_ws" Component: (1001) "some_Automated_Scripts" Change sets: (1002) ---$ john "test memory" 17-Sep-2014 02:24 PM Changes: --a--... (9 Replies)
Discussion started by: gaurav99
9 Replies

9. UNIX for Dummies Questions & Answers

Log file - Delete duplicate line & keep last date

Hello All ! I need your help on this case, I have a csv file with this: ITEM105;ARI FSR;2016-02-01 08:02;243 ITEM101;ARI FSR;2016-02-01 06:02;240 ITEM032;RNO TLE;2016-02-01 11:03;320 ITEM032;RNO TLE;2016-02-02 05:43;320 ITEM032;RNO TLE;2016-02-01 02:03;320 ITEM032;RNO... (2 Replies)
Discussion started by: vadim-bzh
2 Replies

10. UNIX for Beginners Questions & Answers

Delete from another file that matched on log file

I want to write a script using Oscam Cardsharing server this is my test: cat oscam.log | grep "error" sample output: 2018/10/17 16:43:07 5C94A12E p (cccam) cccam(r) test.dyndns.org: login failed, error Once I've found an error, I need to remove its information inside another file : ... (5 Replies)
Discussion started by: vzoli1987
5 Replies

LEARN ABOUT SUNOS

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)
All times are GMT -4. The time now is 07:47 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy