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1. Shell Programming and Scripting
Hi everyone
I have a quick perl matching question. I have the following file, and I want to use perl to search through the 2nd column and see if it finds any of the month names (e.g.: Jan, Feb, Mar, ... Dec).
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2. Shell Programming and Scripting
Hi, sorry, two hash related questions in one day .. but this has got me a bit stuck.
I have a mysql database table that kind of looks like this, the table is called "view1" and a snippet of that table (SELECT'ing just rows with serial number 0629AN1200) is below
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3. Shell Programming and Scripting
I am using sed to find a pattern in a line and then I want to retain the pattern + the rest of the line. How is this possible? ie:
line is: 14158 05-15-08 20:00 123-1234-A21/deliverable/dhm.a
search for 123-1234-A21 ie:
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... (1 Reply)
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4. Shell Programming and Scripting
I've done a quick Google about this, but could not find the answer I want.
Say, there is an array like this:
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5. AIX
Hi,
At best I'm a junior admin with a big problem.
My developers have got my root password and mgmt insists they need it.
I can't even change it when people knowing it leave.
I'm certain they've hardcoded it into routines. I've searched my servers and grepped everything & can't find it.
... (5 Replies)
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6. UNIX for Dummies Questions & Answers
Hello all,
Quick question from a fairly new to Unix developer.
if
then
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fi
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7. UNIX for Dummies Questions & Answers
Hi,
Is there a simple way, using ksh, to find the byte position in a file that a stated character appears?
Many thanks
Helen (2 Replies)
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8. Shell Programming and Scripting
Hi i just wanted to know is there anyway to log the keystrokes on a remote computer? For example i let my nieces play on my other computer downstairs *my computer and the one downstairs are on a LAN* and i want to see everything they type in to make sure they arent doing anything they are supposed... (1 Reply)
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9. UNIX for Advanced & Expert Users
This "SHOULD" be a simple question,
but looking through several books has turned up nothing,
so I turn once again to the experts!!
How do you vi a file so that you can see special characters.
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10. UNIX for Dummies Questions & Answers
Hello There!
I am trying to write this SIMPLE script in Bourne Shell but I keep on getting syntax errors. Can you see what I am doing wrong? I've done this before but I don't see the difference. I am simply trying to take the day of the week from our system and when the teachers sign on I want... (7 Replies)
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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 v5.12.1 2010-04-26 bytes(3pm)