11-27-2003
Try it,
echo abcd | sed -n 's/\(^.[^$]*\)\(.\{3\}$\)/\2/p'
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Ok, I'm stumped and can't seem to find relevant info.
(I'm not even sure, I might have asked something similar before.):
I'm trying to use shell scripting/UNIX commands to extract URLs from a fairly large web page, with a view to ultimately wrapping this in PHP with exec() and including the... (2 Replies)
Discussion started by: ropers
2 Replies
2. Shell Programming and Scripting
I want to write a shell script in order to retreive some data from a log file that i have written into.
The string that i want to get is the number 2849 (that is located between | | ).
To explain further, this is the result i get after running "grep LOGIN filename.log" but i need to get the... (25 Replies)
Discussion started by: danland
25 Replies
3. UNIX for Dummies Questions & Answers
Hello, my name is Marc, I'm a linux starter :) and I hope you specialists can help me solving this issue.
I have a file containing a lot of data. Somewhere in this file, there's a string called "Faultdump", directly followed by 64 chars of HEX data. I need to get the HEX part. I accomplished... (12 Replies)
Discussion started by: Kally
12 Replies
4. Shell Programming and Scripting
Hello Unix gurus,
I have a gzipped file where each line contains 2 street addresses in the US. What I want to do is get a count for each state that does not match.
What I have so far is:
$ gzcat matched_10_09.txt.gz |cut -c 106-107,184-185 | head -5
CTCT
CTNY
CTCT
CTFL
CTMA
This cuts... (5 Replies)
Discussion started by: sitney
5 Replies
5. Shell Programming and Scripting
I have a string I keep appending too upto certain amount of chars.
Is there some sort of way for me to check the string to see if I hit my limit of repeatable characters?
For example, assume I allow for 2 repeatable chars, this will be a valid
string Xxh03dhJUX, so I can append the last... (3 Replies)
Discussion started by: BeefStu
3 Replies
6. Shell Programming and Scripting
how can i print all the chars of a string one by line?
i have thought that use a for cicle and use this command inside:
${VARIABLE:0:last}but how can i make last? because string is random
P.S. VARIABLE is the string
or can i make a variable for every chars of this string?
this was my idea... (10 Replies)
Discussion started by: tafazzi87
10 Replies
7. Shell Programming and Scripting
Hi,
INPUT:
DCBADD
OUTPUT:
ABCD
The SED script should alphabetically sort the chars in the string and remove the duplicate chars. (5 Replies)
Discussion started by: jds93
5 Replies
8. UNIX for Dummies Questions & Answers
Hi guys,
I am trying to find the following string in a file, but I always get pattern not found error, not sure what is missing here. Can you help please?
I do a less to open the xrates.log and then do a /'="18"' in the file and tried various combinations to search the below string.
String... (8 Replies)
Discussion started by: santokal
8 Replies
9. Shell Programming and Scripting
Hi All,
I have a file fo around 15k bytes which i need to insert a string " + "at every 250 bytes.
I found some ideas here using perl to split into lines and tried to addapt it but the results where not satisfactory
for instance i tried to change
#!/usr/bin/perl
$teststring =... (9 Replies)
Discussion started by: kadu
9 Replies
10. Shell Programming and Scripting
For a given string that may contain any ASCII chars, i.e. that matches .*,
find and print only the chars that are in a given subset.
The string could also have numbers, uppercase, special chars such as ~!@#$%^&*(){}\", whatever a user could type in
without going esoteric
For simplicity take... (1 Reply)
Discussion started by: naderra
1 Replies
SUBSTR(3) 1 SUBSTR(3)
substr - Return part of a string
SYNOPSIS
string substr (string $string, int $start, [int $length])
DESCRIPTION
Returns the portion of $string specified by the $start and $length parameters.
PARAMETERS
o $string
- The input string. Must be one character or longer.
o $start
- If $start is non-negative, the returned string will start at the $start'th position in $string, counting from zero. For
instance, in the string ' abcdef', the character at position 0 is ' a', the character at position 2 is ' c', and so forth. If
$start is negative, the returned string will start at the $start'th character from the end of $string. If $string is less than or
equal to $start characters long, FALSE will be returned.
Example #1
Using a negative $start
<?php
$rest = substr("abcdef", -1); // returns "f"
$rest = substr("abcdef", -2); // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
o $length
- If $length is given and is positive, the string returned will contain at most $length characters beginning from $start (depend-
ing on the length of $string). If $length is given and is negative, then that many characters will be omitted from the end of
$string (after the start position has been calculated when a $start is negative). If $start denotes the position of this trunca-
tion or beyond, false will be returned. If $length is given and is 0, FALSE or NULL, an empty string will be returned. If
$length is omitted, the substring starting from $start until the end of the string will be returned.
Example #2
Using a negative $length
<?php
$rest = substr("abcdef", 0, -1); // returns "abcde"
$rest = substr("abcdef", 2, -1); // returns "cde"
$rest = substr("abcdef", 4, -4); // returns false
$rest = substr("abcdef", -3, -1); // returns "de"
?>
RETURN VALUES
Returns the extracted part of $string; or FALSE on failure, or an empty string.
CHANGELOG
+--------------+---------------------------------------------------+
| Version | |
| | |
| | Description |
| | |
+--------------+---------------------------------------------------+
|5.2.2 - 5.2.6 | |
| | |
| | If the $start parameter indicates the position |
| | of a negative truncation or beyond, false is |
| | returned. Other versions get the string from |
| | start. |
| | |
+--------------+---------------------------------------------------+
EXAMPLES
Example #3
Basic substr(3) usage
<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
echo substr('abcdef', 0, 4); // abcd
echo substr('abcdef', 0, 8); // abcdef
echo substr('abcdef', -1, 1); // f
// Accessing single characters in a string
// can also be achieved using "square brackets"
$string = 'abcdef';
echo $string[0]; // a
echo $string[3]; // d
echo $string[strlen($string)-1]; // f
?>
Example #4
substr(3) casting behaviour
<?php
class apple {
public function __toString() {
return "green";
}
}
echo "1) ".var_export(substr("pear", 0, 2), true).PHP_EOL;
echo "2) ".var_export(substr(54321, 0, 2), true).PHP_EOL;
echo "3) ".var_export(substr(new apple(), 0, 2), true).PHP_EOL;
echo "4) ".var_export(substr(true, 0, 1), true).PHP_EOL;
echo "5) ".var_export(substr(false, 0, 1), true).PHP_EOL;
echo "6) ".var_export(substr("", 0, 1), true).PHP_EOL;
echo "7) ".var_export(substr(1.2e3, 0, 4), true).PHP_EOL;
?>
The above example will output:
1) 'pe'
2) '54'
3) 'gr'
4) '1'
5) false
6) false
7) '1200'
ERRORS
/EXCEPTIONS
Returns FALSE on error.
Example #5
<?php
var_dump(substr('a', 1)); // bool(false)
?>
SEE ALSO
strrchr(3), substr_replace(3), preg_match(3), trim(3), mb_substr(3), wordwrap(3), String access and modification by character.
PHP Documentation Group SUBSTR(3)