Sponsored Content
Top Forums UNIX for Dummies Questions & Answers File read/delete synchronization in unix Post 302165640 by saumya.c on Friday 8th of February 2008 11:28:43 AM
Old 02-08-2008
Java File read/delete synchronization in unix

Hi,

I have 2 processes that will be accessing the same file. First process first reads from the file, closes it and then opens it again to write to it (this is done sequentially). The second process may delete the file on some condition. These processes are independent of each other now.

What I'd like to know is whether unix handles the delete synchronously i.e. if the file is being read and the first process is holding on to the file handler, will the second process fail deletion, or will the deletion succeed but the read will fail. Similarly when the first process is doing the write.

As of now we wouldn't like to introduce any special synchronization between these two processes if the behavior is known. Please let me know where I can find more details about this.

Thanks.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

UNIX/Win passwd synchronization utility

I know I saw a couple posts about this a long time ago, but could not find them with search. Please refresh my memory. -Chuck (1 Reply)
Discussion started by: 98_1LE
1 Replies

2. Shell Programming and Scripting

How to delete multiple space or tabs from a read only file

Hi, Actually I am want to cut the three fields of "file-nr" file. $ cat /proc/sys/fs/file-nr 638 219 52270 I want to assign these value to diffrent varibales as follow:- a=638 b=219 c=52270 I tried to use cut command for this purpose and also tried to squeeze all sapces... (6 Replies)
Discussion started by: bisla.yogender
6 Replies

3. Shell Programming and Scripting

Delete files older than 3 months.(read date from the name of the file)

Guys, My log files stored in the date format format below(log_20080714072942): TIMESTAMP=`date +%Y%m%d%H%M%S` LOG=/log/log_${TIMESTAMP}.log I'm looking for a shell script which deletes all files which is older than 3 months from today. Regards, Bhagat (3 Replies)
Discussion started by: bhagat.singh-j
3 Replies

4. Solaris

Before I delete any file in Unix, How can I check no open file handle is pointing to that file?

I know how to check if any file has a unix process using a file by looking at 'lsof <fullpath/filename>' command. I think using lsof is very expensive. Also to make it accurate we need to inlcude fullpath of the file. Is there another command that can tell if a file has a truely active... (12 Replies)
Discussion started by: kchinnam
12 Replies

5. Shell Programming and Scripting

echo ls to a file and then read file and selectively delete

I'm trying to write a script that will do an ls of a location, echo it into a file, and then read that file and selectively delete files/folders, so it would go something like this: cd $CLEAN_LOCN ls >>$TMP_FILE while read LINE do if LINE = $DONTDELETE skip elseif LINE =... (2 Replies)
Discussion started by: MaureenT
2 Replies

6. Shell Programming and Scripting

Read column from file and delete rows with some condition..

Hi.... I have a need of script to do delete row whenever condition is true.... 2.16 (3) 1 3 9999 0 (1) (0) 34.42 (4) 1 3 9999 37 (2) (3) 34.38 (4) 1 3 9999 64 (2) (3) 34.4 (4) 1 3 1 ... (13 Replies)
Discussion started by: nex_asp
13 Replies

7. Shell Programming and Scripting

Help with UNIX script --Read from one file and delete entries in other

Hi Guru's The script has to read an entry from one file and delete the set of lines form other file. Below is the format of the file. In the below example, script should read the entries from input file 2 and delete the entries from input file 1. Input file 1 cn: test@test1.com abc:... (7 Replies)
Discussion started by: Samingla
7 Replies

8. UNIX for Dummies Questions & Answers

How to read a file without opening the file and delete last line?

I have file called "text". The contents are as below : aaa bbb ccc ddd eee ffff ddd hhhh iiii I want to read this file without opening and and delete the last line. How can it be done? (4 Replies)
Discussion started by: the_hunter
4 Replies

9. UNIX for Beginners Questions & Answers

How to give permissions to read write but not delete the file?

i want to give users the ability to create write and read files in other user directory , but not to have option to delete the file after created ( sticky bit not going to work here ... ) for example : i have user : manager with directory repository i have user : worker1 that need to write... (4 Replies)
Discussion started by: umen
4 Replies

10. Shell Programming and Scripting

Read CSV file and delete hdfs, hive and hbase tables

I have a CSV file with hdfs directories, hive tables and hbase tables. 1. first column - hdfs directories 2. second column - hive tables 3. third column - hbase tables I have to check the csv file and look for the first column and delete the hdfs directory from the hdfs path, now... (2 Replies)
Discussion started by: shivamayam
2 Replies
term::ansi::ctrl::unix(n)					 Terminal control					 term::ansi::ctrl::unix(n)

__________________________________________________________________________________________________________________________________________________

NAME
term::ansi::ctrl::unix - Control operations and queries SYNOPSIS
package require Tcl 8.4 package require term::ansi::ctrl::unix ?0.1? ::term::ansi::ctrl::unix::import ?ns? ?arg...? ::term::ansi::ctrl::unix::raw ::term::ansi::ctrl::unix::raw ::term::ansi::ctrl::unix::columns ::term::ansi::ctrl::unix::rows _________________________________________________________________ DESCRIPTION
WARNING: This package is unix-specific and depends on the availability of two unix system commands for terminal control, i.e. stty and tput, both of which have to be found in the $PATH. If any of these two commands is missing the loading of the package will fail. The package provides commands to switch the standard input of the current process between raw and cooked input modes, and to query the size of terminals, i.e. the available number of columns and lines. API
INTROSPECTION ::term::ansi::ctrl::unix::import ?ns? ?arg...? This command imports some or all attribute commands into the namespace ns. This is by default the namespace ctrl. Note that this is relative namespace name, placing the imported command into a child of the current namespace. By default all commands are imported, this can howver be restricted by listing the names of the wanted commands after the namespace argument. OPERATIONS ::term::ansi::ctrl::unix::raw This command switches the standard input of the current process to raw input mode. This means that from then on all characters typed by the user are immediately reported to the application instead of waiting in the OS buffer until the Enter/Return key is received. ::term::ansi::ctrl::unix::raw This command switches the standard input of the current process to cooked input mode. This means that from then on all characters typed by the user are kept in OS buffers for editing until the Enter/Return key is received. ::term::ansi::ctrl::unix::columns This command queries the terminal connected to the standard input for the number of columns available for display. ::term::ansi::ctrl::unix::rows This command queries the terminal connected to the standard input for the number of rows (aka lines) available for display. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
ansi, columns, control, cooked, input mode, lines, raw, rows, terminal COPYRIGHT
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net> term 0.1 term::ansi::ctrl::unix(n)
All times are GMT -4. The time now is 11:45 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy