09-25-2008
The file is being updated continuously, so that might not be the right solution as data should not be lost in moving to a temp file and renaming it.
sed -i, should probably do what you are looking for.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Is there an option, for cat, head, tail, or is there any way, to display a file from last line to first? For example, my file
looks like this:
aaaa
bbbb
cccc
eeee
and I would like to print or display it like this:
eeee
cccc
bbbb
aaaa
thanks (5 Replies)
Discussion started by: jpprial
5 Replies
2. Shell Programming and Scripting
Hi,
Fairly new to unix scripting, hoping to get some help.
using AIX v5
Basically I have 3 files 1). Header record 2). many detail record 3). Trailer record
My desired result is 1 file which contains Heaeder, Detail, Trailer
Currenty I am using a series of:
... (8 Replies)
Discussion started by: CBZ
8 Replies
3. UNIX for Dummies Questions & Answers
Hi,
I am using ">>" to append to the existing file but I appens to the end of the file but I want to add tne new things at the beginning. Do we have any functionality to do that?
Thanks,
Siba (1 Reply)
Discussion started by: siba.s.nayak
1 Replies
4. Linux
How would I do that?
/Rutger (6 Replies)
Discussion started by: rutgerblom
6 Replies
5. UNIX for Dummies Questions & Answers
Hello,
I have 50 text files in a directory called "AllFiles"
I want to make a program that will go inside of the "AllFiles" Directory and count the number of lines in each individual text file. Then, the program will calculate how many more lines there are over 400 in each text file and... (7 Replies)
Discussion started by: motoxeryz125
7 Replies
6. Shell Programming and Scripting
I am writing a code to append some numbers in the beginning of each line in all the files present in a directory. The number of files are really huge. The files are numbered as 1.sco, 2.sco, 4.sco (Note: 3.sco is missing).
The files currently look like this:
1.sco
2 3
5 6
6 7My task is to... (4 Replies)
Discussion started by: shoaibjameel123
4 Replies
7. Shell Programming and Scripting
I want to append file names at the beginning of a line for each row
file content
abc.txt.gz 123|654|987
bcd.txt.gz 876|trf|kjh
I want a single output file with below format
abc.txt.gz|123|654|987
bcd.txt.gz|876|trf|kjh
This one is working but only with unzip files,need to have... (3 Replies)
Discussion started by: rakesh5300
3 Replies
8. Shell Programming and Scripting
Hi,
I have multiple files having many lines like as bvelow:
file Name a.txt
abc def
def xyz
123 5678
file Name b.txt
abc def
def xyz
123 5678
I would like to append files in the below format to a new file:
file Name c.txt (7 Replies)
Discussion started by: rramkrishnas
7 Replies
9. Shell Programming and Scripting
Hi Guys,
IF i have to append data to a variable, i simply use the following. What can i do to append data to the beginning?
VAR+="data" (6 Replies)
Discussion started by: srkmish
6 Replies
10. Shell Programming and Scripting
Hi,
I now that >> will append text to the end of the text that is already inside the file.
How to append the new text infront of the text that is already in the file.
Thanks for any input.
Regards,
Chandu (3 Replies)
Discussion started by: chandrakanth
3 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)