I recently started as an intern and my manager wanted to see how well I would handle Korn Bourne shell scripting without any prior experience, I have prior programming experience but I keep running into syntax errors with AWK. Please take a look at my simple code and tell me what stupid mistake... (6 Replies)
All,
Does it matter what perl verios your running when you get syntax errors?
on version 5.6.1 the code works fine, but on 5.8.0 the code gets errors?
#!/usr/bin/perl
#use strict;
#use warnings;
my $mess = 'messages';
my $mess1 = 'messages.1';
my $mess2 = 'messages.2';
my... (13 Replies)
Hi,
I am a newbie to PERL and working on a script. When running it I get a lot of compilation errors.
The actual command in the program (which is within a case structure) is given below
# This gives the actual count of inquires from a log file (It works fine when I type this on the... (2 Replies)
I want to delete archivelog files that has been archived and applied from primary database
to standby database. This piece of script is working in Linux server. However, I copy it to
Unix server with tiny modification. It won't work and generate the error message. I have checked
code carefullt... (8 Replies)
I have directory /test/logs which has multiple logs:
audit.log
audit.log.1
audit.log.2
audit.log.3
audit.log.4
audit.log.5
audit.log is current log file and audit.log.X are archive log files. I need to search within these log files and count word "error-5" logged within last 6 months... (4 Replies)
Original script written on CentOS 6.3 with GNU bash 4.1.2
Destination system is Solaris 9 with GNU bash 2.05 (not changeable by me)
I have a script written on the linux side but now we need to provide a version to another site that "doesn't like linux". I've been going through changing the ] or... (13 Replies)
Hello,
I have been working on Awk/sed one liner which counts the number of occurrences of '|' in pipe separated lines of file and delete the line from files if count exceeds "17".
i.e need to get records having exact 17 pipe separated fields(no more or less)
currently i have below :
awk... (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
This script will analyse the channels.txt e registrations.txt and it will allow to mage the channels and the... (9 Replies)
I believe there are couple of syntax issues in my script, couldn't find them :(
can someone help me with fixing it to make it work.
cd /abcde/
#get the latest filename excluding subdirs
filename=`ls -ltr | grep ^- | tail -1 | awk '{print $8}'`
#get system date and file timestamp and... (3 Replies)
Discussion started by: simpltyansh
3 Replies
LEARN ABOUT PHP
substr
SUBSTR(3) 1 SUBSTR(3)substr - Return part of a stringSYNOPSIS
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)