Open file for update : Open file « File « Perl






Open file for update

    

#!/usr/bin/perl
use warnings;
use strict;

use Fcntl qw(:seek :flock);

open LOGFILE, ">>", "/tmp/mylog" or die "Unable to open: $! \n";

# lock file for exclusive access
flock LOGFILE, LOCK_EX;

# now seek to end of file explicitly, in case it changed since the open
seek LOGFILE, 0, SEEK_END;

# write our log message
print LOGFILE "Log message...\n";

# remove lock and close file
flock LOGFILE, LOCK_UN;
close LOGFILE;

   
    
    
    
  








Related examples in the same category

1.To open a file for appending:
2.To open a file for reading and writing:
3.To open a file for reading:
4.To open a file for writing
5.open (FILEHANDLE, "<&FILEHANDLE2");
6.open (FILEHANDLE2, "<&=FILEHANDLE");
7.open(MYFILE, ">>c:\\outfile.dat")
8.Open FILEHANDLE
9.Open Operators
10.Open a file
11.Open a file from another file handle
12.Open a file to read
13.Open a pipe to the who command
14.Open command expressions
15.Open file for writing
16.Open file reading
17.Open for Appending
18.Open for Reading
19.Open for Reading and Writing
20.Open for Writing
21.Open for writing first, then reading
22.Opening an input filter on a Win32 platform
23.Opening files and using file handles: open(filehandle, name);
24.Opens two files and copies one into another.
25.Checks whether an unopened file actually exists.
26.Input Filter: open(FILEHANDLE, COMMAND|);
27.Sending the Output of a Filter to a File: open(STDOUT, ">/dev/tty");
28.Uses die when testing for a successful file open operation.
29.Using open to connect different processes