Sponsored Content
Full Discussion: File read/ write operation
Operating Systems Linux File read/ write operation Post 302425573 by Corona688 on Friday 28th of May 2010 01:21:27 PM
Old 05-28-2010
Quote:
Originally Posted by xs2punit
I do not want to lock anything.
Clearly. You should, though. Otherwise you're going to hit all the pitfalls we've been telling you about repeatedly, and all you'll be doing by doing it in AJAX instead is building your own slower, buggier, flock-over-http protocol from the ground up.
Quote:
Issue is server doesn't release the file to be read.
Doesn't release the file? What error do you get when you try to retrieve it -- does it think the file's not present at all, or give 'permission denied', etc. Either is quite odd, most UNIX systems don't do mandatory locking of open files, nor play tricks to hide files until they're complete; what system are you using?

Last edited by Corona688; 05-28-2010 at 02:32 PM..
 

10 More Discussions You Might Find Interesting

1. IP Networking

how do you get to know if the write operation was succesful.

how do you get to know if the write operation for writing to a socket was succesful was succesful. (3 Replies)
Discussion started by: arjunjag
3 Replies

2. Shell Programming and Scripting

read and write from a file

I have tried to show the file name whose size is greater than 200 byte in current directory. Please help me. ls -l | tr -s " " " " | cut -f 5,9 -d " " >out.txt #set -a x `cat out.txt` i=0 `cat out.txt` | while do read x echo $x #re=200 j=0 if }" < "200" ] then echo $j j=`expr $j... (2 Replies)
Discussion started by: rinku
2 Replies

3. UNIX for Dummies Questions & Answers

Simultaneous file read operation

Hi All, I need information on file handling in UNIX enviornment. If in UNIX enviornment I have two process.. P1 P2 Both accessing the same file simultaneosuly(read operation).. Suppose P1 opened the file in read mode first and started reading the file.. Then P2 opens the same file in... (5 Replies)
Discussion started by: chibob
5 Replies

4. UNIX for Dummies Questions & Answers

Write/read to file descriptors

Is it possible to write to file descriptor 0 and read from 1 or 2? How could this be implemented? (3 Replies)
Discussion started by: machshev
3 Replies

5. Solaris

monitoring multipath IO for read and write operation

Hi Folks, I would like to monitor multipath IO on solaris for write and read operations. Does "sar -d" include multipath IO information along with other block devices ? Thanks, Faizan. (0 Replies)
Discussion started by: sifaizan
0 Replies

6. IP Networking

read/write,write/write lock with smbclient fails

Hi, We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Discussion started by: swatidas11
1 Replies

7. Shell Programming and Scripting

Transferring file write operation to another host

I have a process running on two hosts in Active/Standby mode. Process running on active machine is handling the traffic while process running on Standby machine is sitting idle. We have a debugging mechanism in which logs are generated on local machine. When logging is enabled then process running... (1 Reply)
Discussion started by: akhilonnet
1 Replies

8. Shell Programming and Scripting

Grab data between 2 keywords any do an array operation and write the file intact

Hi Unix Gurus, I need to grep for a block that is between a start and end keyword and then in between I need to find and replace a keyword. for eg: I need to search between Test = 000; and Test = 000; and find K9 and replace with M9 INPUT FILE Define { Replace = K9; Test =... (6 Replies)
Discussion started by: naveen@
6 Replies

9. Shell Programming and Scripting

File Read and Write

I have got a file in following format: AAAAAAA BBBBBBBB CCCCCCC DDDDDDD I am trying to read this file and out put it in following format: AAAAAAA,BBBBBBB,CCCCCCC,DDDDDD Preferred method is shell or Perl. Any help appreciated. (11 Replies)
Discussion started by: Araoki
11 Replies

10. Shell Programming and Scripting

Read and write in the file

Hello Guys, How all are doing? I have an issue in Unix and want help from all of you I have a file in UNIX which it read by line by line , If at the end of line '0' is written the it should fetch that line into another file and change '0' to '1' and If at the end of line '1' is written then it... (10 Replies)
Discussion started by: adisky123
10 Replies
SHELL-QUOTE(1)						User Contributed Perl Documentation					    SHELL-QUOTE(1)

NAME
shell-quote - quote arguments for safe use, unmodified in a shell command SYNOPSIS
shell-quote [switch]... arg... DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands or files with embedded white space or shell globbing characters safely. Here are a few examples. EXAMPLES
ssh preserving args When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and passes them to "$SHELL -c". This doesn't work as intended: ssh host touch 'hi there' # fails It creates 2 files, hi and there. Instead, do this: cmd=`shell-quote touch 'hi there'` ssh host "$cmd" This gives you just 1 file, hi there. process find output It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote: eval set -- `find -type f -print0 | xargs -0 shell-quote --` debug shell scripts shell-quote is better than echo for debugging shell scripts. debug() { [ -z "$debug" ] || shell-quote "debug:" "$@" } With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can. save a command for later shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are things the user can't pass through), you can do something like this: user_switches= while [ $# != 0 ] do case x$1 in x--pass-through) [ $# -gt 1 ] || die "need an argument for $1" user_switches="$user_switches "`shell-quote -- "$2"` shift;; # process other switches esac shift done # later eval "shell-quote some-command $user_switches my args" OPTIONS
--debug Turn debugging on. --help Show the usage message and die. --version Show the version number and exit. AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions. AUTHOR
Roderick Schertler <roderick@argon.org> perl v5.16.3 2010-06-11 SHELL-QUOTE(1)
All times are GMT -4. The time now is 11:46 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy