02-15-2013
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Not sure if the title of this thread makes sense, but hopefully my explanation will.
I'm using awk to print some stats from an apache accesslog. I would like to specify the regexp condition where only the two root pages of "index.html" and "/" are counted in my results. What I can't figure out... (3 Replies)
Discussion started by: picassolsus
3 Replies
2. Shell Programming and Scripting
Hi ,
I have below file with 13 columns. I need 2-13 columns seperated by comma and I want to append each row with a string "INSERT INTO xxx" in the begining as 1st column and then a variable "$node" and then $2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13 and at the end another string " ; COMMIT;"
... (4 Replies)
Discussion started by: Vaddadi
4 Replies
3. Shell Programming and Scripting
Hi Guys,
I am trying to write a perl script to search a string "Name" in the file "FILE" and also want to create a new file and push the searched string Name line along with 10 lines following the same.
can anyone of you please let me know how to go about it ? (8 Replies)
Discussion started by: sukrish
8 Replies
4. Shell Programming and Scripting
How can I do this? Actually I have a file which contains a path
e.g.
/home/john/Music/hello.mp3
and I want to take only the filename (hello.mp3) So, I need to read the file from its end to its start till the character "/"
Is this possible?
Thanks, I am sure you'll not disappoint me here!
Oh,... (9 Replies)
Discussion started by: hakermania
9 Replies
5. Shell Programming and Scripting
Hi,
1_strings file contains
$ cat 1_strings
/home/$USER/Src
/home/Valid
/home/Review$ cat myxml
<projected value="some string" path="/home/$USER/Src">
<input 1/>
<estimate value/>
<somestring/>
</projected>
<few more lines >
<projected value="some string" path="/home/$USER/check">... (4 Replies)
Discussion started by: greet_sed
4 Replies
6. Shell Programming and Scripting
I have this:
301205 0000030000041.49000000.00 2011111815505 908
301205 0000020000029.10000000.00 2011111815505 962
301205 0000010000027.56000000.00 2011111815505 3083
312291 ... (2 Replies)
Discussion started by: herot
2 Replies
7. Shell Programming and Scripting
Hi,
I have written the following python snippet to store the capital letter starting words into a dictionary as key and no of its appearances as a value in this dictionary against the key.
#!/usr/bin/env python
import sys
import re
hash = {} # initialize an empty dictinonary
for line in... (1 Reply)
Discussion started by: royalibrahim
1 Replies
8. Shell Programming and Scripting
My file (the output of an experiment) starts off looking like this,
_____________________________________________________________
Subjects incorporated to date: 001
Data file started on machine PKSHS260-05CP
**********************************************************************
Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies
9. Shell Programming and Scripting
Hi,
I have a scenario where I want to display the output based on the pattern search between the start and end of a block in a file, we can have multiple start and end blocks in a file.
Example give below, we need to search between the start block abc and end block def in a file, after that... (5 Replies)
Discussion started by: G.K.K
5 Replies
10. UNIX for Beginners Questions & Answers
Hi, In my previous post ( How to print lines from a files with specific start and end patterns and pick only the last lines? ), i have got a help to get the last select statement from a file, now i need to remove/exclude the output from main file:
Input File format:
SELECT
ABCD,
DEFGH,... (2 Replies)
Discussion started by: nani2019
2 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)