Can anyone direct me to a resource that explains scripting in simple terms?
I have visited many sites and browsed this forum and have yet to find simple explanations. (8 Replies)
Hi all! Im wondering if its possible to create a GUI for a shell script I just got done writing as the people that will be using it dont like the command line all to well. Just something simple with radio buttons to select options, maybe a text field to enter a location to save the file generated... (1 Reply)
Hi
I want to write a small script that will create folders named from `AAAA' all the way to `ZZZZ'.
That is:
`AAAA'
`AAAB'
`AAAC'
...
`AABA'
`AABB'
`AABC'
...
`ABAA'
`ABAB'
`ABAC'
...
`ABBA'
...
`ZZZZ' (4 Replies)
I have a local account for a unix server. The idle timeout for the account is around 10 mins. I have to login to the server multiple times during the day. Is there a way to increase the idle timeout or may be a script that I can run on background so it is not idle. Something like echo date every 9... (3 Replies)
Hello - I am in process of deleting many files which are older than 4 weeks.
For example I am inside:
/subsystem/prod/
Files are with various extentions, but anything older than 4 weeks should be deleted.
What would be the most simplest script to acheive this? (4 Replies)
Hi all, I am brand new to these forums and I am a brand new UNIX Administartor. Don't know any scripting yet :wall:, and would like to learn as my boss is slowly letting me understand everything about being a Sys/*Nix Admin. He created this script which I am trying to replicate because I lost it... (54 Replies)
Dear all,
I have a directory named A and some subdirectories named B, C, D with .xml files. I want to use the following command to strip the file.
sed -re ':start s/<*>//g; /</ {N; b start}' file.xml > file.xml
At the same time, I want to remove the blank lines using
sed '/^$/d'
How can... (6 Replies)
Hello all!
This is my first post and I'm very new to programming. I would like help creating a simple perl or bash script that I will be using in my work as a junior bioinformatician.
Essentially, I would like to take a tab-delimted or .csv text with 3 columns and write them to a "3D" matrix:
... (16 Replies)
Hello ,
I am new in this forum and need your help as I am totally confused :confused:
I read a lot of threads and tried to search a lot but did not get the exact answer to my question.
I just want a simple (content wise may be long) shell script to create oracle database.
In detail:... (5 Replies)
This is the problem: Write a script that will make a backup of a file giving it a ‘.bak’ extension & verify that it works. I have tried a number of different scripts that haven't worked and I haven't seen anything really concise and to the point via google. For brevity's sake this is one of the... (4 Replies)
Discussion started by: demet8
4 Replies
LEARN ABOUT OSX
io::atomicfile
IO::AtomicFile(3) User Contributed Perl Documentation IO::AtomicFile(3)NAME
IO::AtomicFile - write a file which is updated atomically
SYNOPSIS
use IO::AtomicFile;
### Write a temp file, and have it install itself when closed:
my $FH = IO::AtomicFile->open("bar.dat", "w");
print $FH "Hello!
";
$FH->close || die "couldn't install atomic file: $!";
### Write a temp file, but delete it before it gets installed:
my $FH = IO::AtomicFile->open("bar.dat", "w");
print $FH "Hello!
";
$FH->delete;
### Write a temp file, but neither install it nor delete it:
my $FH = IO::AtomicFile->open("bar.dat", "w");
print $FH "Hello!
";
$FH->detach;
DESCRIPTION
This module is intended for people who need to update files reliably in the face of unexpected program termination.
For example, you generally don't want to be halfway in the middle of writing /etc/passwd and have your program terminate! Even the act of
writing a single scalar to a filehandle is not atomic.
But this module gives you true atomic updates, via rename(). When you open a file /foo/bar.dat via this module, you are actually opening a
temporary file /foo/bar.dat..TMP, and writing your output there. The act of closing this file (either explicitly via close(), or
implicitly via the destruction of the object) will cause rename() to be called... therefore, from the point of view of the outside world,
the file's contents are updated in a single time quantum.
To ensure that problems do not go undetected, the "close" method done by the destructor will raise a fatal exception if the rename() fails.
The explicit close() just returns undef.
You can also decide at any point to trash the file you've been building.
AUTHOR
Primary Maintainer
David F. Skoll (dfs@roaringpenguin.com).
Original Author
Eryq (eryq@zeegee.com). President, ZeeGee Software Inc (http://www.zeegee.com).
REVISION
$Revision: 1.2 $
perl v5.16.2 2005-02-10 IO::AtomicFile(3)