Hello every one, I have read a little about SED and GREP but I do not know how to do this:
Using SED or GREP:
"reverse all three letter words"
"replace the last two digits in any string of digits by zeros (0)"
"remove lines that start and end with the same word"
and I have more like... (5 Replies)
I am using this command to replace a text string in a data file:
sed -e 's/ab/test2/g' -e 's/abcxyz/test1/g' datafile
datafile contains:
ab
abcxyz
My results:
test2
test2cxyz
I want my results to be:
test2
test1 (7 Replies)
hey all, I have question when am writing simple shell...
in the child am calling execvp, i want the parent to know when execvp returns - 1. how can i let the parent know the result of execvp
thanks in advance (9 Replies)
Greetings all,
...here is yet another string of awk/sed questions from a RegExp-Challenged luser :eek:
I'm looking to have sed/awk do some clean-up on routing tables and to that end, I would like to do the following:
1.) If a line contains the word "masks" or "subnets" prepend CR/LF to... (16 Replies)
1.) I am to write scripts that will be phasetest folder in the home directory.
2.) The folder should have a set-up,phase and display files
I have written a small script which i used to check for the existing users and their password.
What I need help with:
I have a set of questions in a... (19 Replies)
This was mistaken as homework in a different forum, but is not. These are questions that are close to what I am trying to do at work.
QUESTION1:
How do you grep only an exact string. I am using Solaris10 and do not have any GNU products installed.
Contents of car.txt
CAR1_KEY0
CAR1_KEY1... (1 Reply)
This post was previously mistaken for homework, but is actually a small piece of what I working on at work. Please answer if you can.
QUESTION1
How do you grep only an exact string. I am using Solaris10 and do not have any GNU products installed.
Contents of car.txt
CAR1_KEY0
CAR1_KEY1... (2 Replies)
Hi. I have a txt file. I need to make a copy of the lines which are beginning with a mobile phone number, or a fix phone number. I have to copy thoose lines in numbers.txt, after that i have to delete then from the originally file. In numbers.txt i need to write a prefix before each number. if the... (1 Reply)
Hello Experts..
I have 3-4 C codes with Oracle SQL statements embedded. All the SQL statements starts with EXEC SQL keyword and ends with ;. I want to extract all the SQL statements out of these codes.
I did awk '/^EXEC SQL/,/\;/' inputFile (I use this on all of the codes individually). That... (2 Replies)
Discussion started by: juzz4fun
2 Replies
LEARN ABOUT MOJAVE
bytes5.18
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)