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Top Forums Shell Programming and Scripting Need help on find and replacement on specific line and position Post 302883946 by Akshay Hegde on Thursday 16th of January 2014 09:54:33 PM
Old 01-16-2014
Some example might help you to understand

Code:
# Replace 3rd char with star
$ echo "1234567890" | awk -F "" '{gsub(".","*",$3)}1' OFS=""
12*4567890

# Replace 5th char onwards with some string
$ echo "1234567890" | awk  '{$0=substr($0,1,5) New}1' New="tester"
12345tester

Read below one

substr(string, start, length)This returns a length-character-long substring of string, starting at character number start. The first character of a string is character number one.

Example:
substr("washington", 5, 3) returns "ing". If length is not present, this function returns the whole suffix of string that begins at character number start.

substr("washington", 5) returns "ington". This is also the case if length is greater than the number of characters remaining in the string, counting from character number start.
 

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MB_STRCUT(3)								 1							      MB_STRCUT(3)

mb_strcut - Get part of string

SYNOPSIS
string mb_strcut (string $str, int $start, [int $length = NULL], [string $encoding = mb_internal_encoding()]) DESCRIPTION
mb_strcut(3) extracts a substring from a string similarly to mb_substr(3), but operates on bytes instead of characters. If the cut position happens to be between two bytes of a multi-byte character, the cut is performed starting from the first byte of that character. This is also the difference to the substr(3) function, which would simply cut the string between the bytes and thus result in a malformed byte sequence. PARAMETERS
o $str - The string being cut. o $start - Starting position in bytes. o $length - Length in bytes. If omitted or NULL is passed, extract all bytes to the end of the string. o $encoding -The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used. RETURN VALUES
mb_strcut(3) returns the portion of $str specified by the $start and $length parameters. SEE ALSO
mb_substr(3), mb_internal_encoding(3). PHP Documentation Group MB_STRCUT(3)
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