Hi Folks!
I am a MacUser and am trying to learn Unix for the last few months.
I will explain in detail what I am trying to do, and apreciate you help if you can teach me even if it is a single comand line inside the script.
I own a small company, where I manufacture special gypsums and... (5 Replies)
Hi All,
I want to read username and lastupdate only from /etc/security/passwd and write the same data to another file:
The data in /etc/security/passwd will be in this form for example:
For more details : http://www.unet.univie.ac.at/aix/files/aixfiles/passwd_security.htm#A1219924
smith:... (0 Replies)
UNIX shell script (Bourne shell syntax) called
admin_script. This script is described below as a usage summary:
admin_script
Note: if no options are specified, a menu is displayed which allows
users to perform one of the following tasks and then exit. If
incorrect options are provided,... (1 Reply)
Hello,
I have done some BASIC shell scripting/PERL scripting before so I am familiar with the languages. I am not really sure which one would lend itself better to the application I have to write.
I am required to scan the message logs for possible break in attempts. If I use shell scripting... (2 Replies)
Hi All,
I have written the following script. I have just repeated some commands, and I am sure there is a more better way to do it. I hope I one of gurus here will help me make it in a better shape. Here is the script:
#! /bin/sh
sed -i -e "s/test2.xxx/test3.xxx/" -e "s/output2/output3/"... (2 Replies)
I am adapting an Open Step ping server script to Ubuntu 8.10 and one section of my script isn't working
# if there are servers that just went down or came back up, notify
# with high importance
if ; then
echo notifying of servers that are up again or just now down
notify high
# if there... (2 Replies)
If I need delete some disk,
for i in hdisk1 hdisk2 hdisk3 hdisk4
do
rmdev -dl $i
done
if I have more than 100 hdisks, how to write a script like that to delete them? (6 Replies)
Hi there :rolleyes:
I have a folder called backup
it is path is: ~/backup
Inside this folder, there are four files:
~/backup/test1.cpp
~/backup/test2.cpp
~/backup/test3.cpp
~/backup/PATHS.TXT
The fourth file PATHS.TXT contains the original paths for the three files. This is the... (4 Replies)
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Hi All,
I have written the follwing script to take the backup of the file every day
along with the date.
DATE=`date +%Y%m%d`
export DATE
cp var/hr/hr333m.txt cp var/hr/payments/hr333m_$DATE.txt
The file name as follows after taking the backup.
hr333m_20110630.txt
Could you... (3 Replies)
Discussion started by: ajaykumarkona
3 Replies
LEARN ABOUT MOJAVE
bytes
bytes(3pm) Perl Programmers Reference Guide bytes(3pm)NAME
bytes - Perl pragma to force byte semantics rather than character semantics
NOTICE
This pragma reflects early attempts to incorporate Unicode into perl and has since been superseded. It breaks encapsulation (i.e. it
exposes the innards of how the perl executable currently happens to store a string), and use of this module for anything other than
debugging purposes is strongly discouraged. If you feel that the functions here within might be useful for your application, this possibly
indicates a mismatch between your mental model of Perl Unicode and the current reality. In that case, you may wish to read some of the perl
Unicode documentation: perluniintro, perlunitut, perlunifaq and perlunicode.
SYNOPSIS
use bytes;
... chr(...); # or bytes::chr
... index(...); # or bytes::index
... length(...); # or bytes::length
... ord(...); # or bytes::ord
... rindex(...); # or bytes::rindex
... substr(...); # or bytes::substr
no bytes;
DESCRIPTION
The "use bytes" pragma disables character semantics for the rest of the lexical scope in which it appears. "no bytes" can be used to
reverse the effect of "use bytes" within the current lexical scope.
Perl normally assumes character semantics in the presence of character data (i.e. data that has come from a source that has been marked as
being of a particular character encoding). When "use bytes" is in effect, the encoding is temporarily ignored, and each string is treated
as a series of bytes.
As an example, when Perl sees "$x = chr(400)", it encodes the character in UTF-8 and stores it in $x. Then it is marked as character data,
so, for instance, "length $x" returns 1. However, in the scope of the "bytes" pragma, $x is treated as a series of bytes - the bytes that
make up the UTF8 encoding - and "length $x" returns 2:
$x = chr(400);
print "Length is ", length $x, "
"; # "Length is 1"
printf "Contents are %vd
", $x; # "Contents are 400"
{
use bytes; # or "require bytes; bytes::length()"
print "Length is ", length $x, "
"; # "Length is 2"
printf "Contents are %vd
", $x; # "Contents are 198.144"
}
chr(), ord(), substr(), index() and rindex() behave similarly.
For more on the implications and differences between character semantics and byte semantics, see perluniintro and perlunicode.
LIMITATIONS
bytes::substr() does not work as an lvalue().
SEE ALSO
perluniintro, perlunicode, utf8
perl v5.18.2 2013-11-04 bytes(3pm)