Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Knowing when a different program modifies a file
Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302795427 by hanson44 on Wednesday 17th of April 2013 05:00:07 PM
Old 04-17-2013
Try the following, and you will see that while you are editing the file, syslog continues to update the log file.

- go to the end of the file in vi and see what is there.
- wait a few minutes to let something loggable happen.
- in a separate window, do a tail on the log file.
- the results will be different, because syslog continues to update the file.

Here is another demo:
Code:
$ date > date.txt
$ vi date.txt # will see single line
$ date >> date.txt # in another window, while vi open
$ cat date.txt
Wed Apr 17 13:56:14 PDT 2013
Wed Apr 17 13:56:27 PDT 2013

When you saved the log file from within vi, you wiped out the changes that syslog had made. Normally, not a good idea to make changes to syslog log file, unless some over-riding benefit.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script that modifies root level files

I run a decent size Solaris 8 network where we use host files and no DNS servers. I have a master host file to push out to all the machines (also would like to do system and services too) but, the only way I've ever been able to do it is buy telneting into the machine and ftping the file into place... (10 Replies)
Discussion started by: turbo90awd
10 Replies

2. UNIX for Advanced & Expert Users

knowing progress while reading a file

Hi, I am parsing a very big file say 10 MB. It 'll take more than an hour ..I want to know the progress say in % .Is there any way to do that??? or (Is there any way to know which line of the file I am in ) (2 Replies)
Discussion started by: sakthi.abdullah
2 Replies

3. UNIX for Dummies Questions & Answers

Rename file knowing the first 7 carachters

Hi, people. I need some help with this: i have this file " PROVEDP_???_yyyymmdd " , and i want to rename to this " IN_PROV_yyyy???.dat " . The " ??? " is the Month , but the file could be created on April, but the name coulb be March, for example.So i need to grab the 3 caracters ... (2 Replies)
Discussion started by: osramos
2 Replies

4. Shell Programming and Scripting

Knowing whether the file has completely SFTP ed

Hi.. Can Anyone out there help me? I need to write a script to convert a file in EDCIDC format to CSV The files will be transfered through sftp to the box. Is there a way to check the file has finished being transfered or still transfering. so that my conversion task will be performed after... (3 Replies)
Discussion started by: ramukandada
3 Replies

5. Shell Programming and Scripting

How Can I get terminal no when someone modifies CRONTAB file

Hi All I have a script which drops a mail with the changes done on crontab file for every 1 hour Can anyone pls tell me how can I modify the script so that it should display the terminal from which the crontab file hasbeen modified. Quick responce much appriciated !! Many thanks in... (7 Replies)
Discussion started by: jagadish_gaddam
7 Replies

6. Shell Programming and Scripting

how to use the filehandle stored in a variable without knowing its file association

how to use the filehandle stored in a variable without knowing its file association i.e. the filename code my $logFH = $connObj->get('logFH'); infoPrint("Variable is of type IO \n") if(UNIVERSAL::isa($logFH, 'IO')); infoPrint("$logFH\n"); output == INFO :: Variable is of type... (0 Replies)
Discussion started by: rrd1986
0 Replies

7. Emergency UNIX and Linux Support

Is there any way to set the files modified date and stamp to last modifies time?

Actually i did modification in a file on server by mistake, now its showing current time stamp, is there any way to set the files modified date and stamp to last modifies time. Please advice here.Thanks in advance.:b: (7 Replies)
Discussion started by: saluja.deepak
7 Replies

8. UNIX Desktop Questions & Answers

Knowing the size and location of variables in a C program

So I need some help with this. Pardon me if I'm posting in the wrong forum, after some googling for my answer and finding nothing I found this forum. It seemed appropriate for what I was seeking. I just didnt find a forum that concerned the use of GDB. I'm learning to use the C language and GDB.... (2 Replies)
Discussion started by: Cambria
2 Replies

9. Solaris

Passwd -l or -u modifies lastchg field in /etc/shadow file

Hi, I have a Solaris 10 box where password aging is not functioning properly. Using the passwd command with the -l or -u options causes the lastchg field in the /etc/shadow file to be modified. Therefore, if a user's password is set to expire in 90 days and they are 1 day away, all they have... (4 Replies)
Discussion started by: cschar
4 Replies

10. Shell Programming and Scripting

Curl to download file from subdivx.com after following location without knowing the file name/extens

This question could be specific to the site subdivx.com In the past, I've been able to download a file following location using cURL but there is something about subdivx.com that's different and can't figure out how to get it to work. I tried the following directly in the terminal with no... (5 Replies)
Discussion started by: MoonD
5 Replies

LEARN ABOUT REDHAT

dos2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - DOS/MAC to UNIX text file format converter

SYNOPSYS

       dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates dos2unix under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      dos2unix

       Convert and replace a.txt. Convert and replace b.txt.

	      dos2unix a.txt b.txt

	      dos2unix -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.  Convert	c.txt  from  Mac  to  Unix
       ascii format.

	      dos2unix a.txt -c iso b.txt

	      dos2unix -c ascii a.txt -c iso b.txt

	      dos2unix -c mac a.txt b.txt

       Convert and replace a.txt while keeping original date stamp.

	      dos2unix -k a.txt

	      dos2unix -k -o a.txt

       Convert a.txt and write to e.txt.

	      dos2unix -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      dos2unix -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      dos2unix a.txt -n b.txt e.txt

	      dos2unix -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHORS

       Benjamin Lin - <blin@socs.uts.edu.au>

       Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       unix2dos(1) mac2unix(1)

1995.03.31							   dos2unix v3.0						       dos2unix(1)
All times are GMT -4. The time now is 06:52 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy