08-16-2009
Count the repetition of a Field in File
Hi,
Thanks for keeping such a help-full platform active and live always.
I am new to this forum and to unix also.
Want to know how to count the repetition of a field in a file. Anything of awk, sed, perl, shell script, solution are welcomed.
Input File------------------
abc,12345
pqr,51223
mno,72121
stu,34567
aaa,12345
pqp,11224
plm,72121
zxy,88888
fgh,12345
jkl,88888
Output File-----------------
abc,12345,3
pqr,51223,1
mno,72121,2
stu,34567,1
aaa,12345,3
pqp,11224,1
plm,72121,2
zxy,88888,2
fgh,12345,3
jkl,88888,2
As 12345 is repeated 3 times in files as second field, so wherever it is "3" is suffixed as last field.
Thanks for the solution in advance.
Ace
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LEARN ABOUT PHP
hash_equals
HASH_EQUALS(3) 1 HASH_EQUALS(3)
hash_equals - Timing attack safe string comparison
SYNOPSIS
bool hash_equals (string $known_string, string $user_string)
DESCRIPTION
Compares two strings using the same time whether they're equal or not.
This function should be used to mitigate timing attacks; for instance, when testing crypt(3) password hashes.
PARAMETERS
o $known_string
- The string of known length to compare against
o $user_string
- The user-supplied string
RETURN VALUES
Returns TRUE when the two strings are equal, FALSE otherwise.
ERRORS
/EXCEPTIONS
Emits an E_WARNING message when either of the supplied parameters is not a string.
EXAMPLES
Example #1
example
<?php
$expected = crypt('12345', '$2a$07$usesomesillystringforsalt$');
$correct = crypt('12345', '$2a$07$usesomesillystringforsalt$');
$incorrect = crypt('apple', '$2a$07$usesomesillystringforsalt$');
var_dump(hash_equals($expected, $correct));
var_dump(hash_equals($expected, $incorrect));
?>
The above example will output:
bool(true)
bool(false)
NOTES
Note
Both arguments must be of the same length to be compared successfully. When arguments of differing length are supplied, FALSE is
returned immediately and the length of the known string may be leaked in case of a timing attack.
Note
It is important to provide the user-supplied string as the second parameter, rather than the first.
PHP Documentation Group HASH_EQUALS(3)