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Full Discussion: File pattern changing
Top Forums Shell Programming and Scripting File pattern changing Post 302715483 by elixir_sinari on Monday 15th of October 2012 03:26:28 AM
Old 10-15-2012
Try this:
Code:
perl -e '$exists=shift @ARGV;$from=shift @ARGV;$to=shift @ARGV;
$fromlen=length($from);$tolen=length($to);
$^I=".bak";
while(<>) {
 if(index($_,$exists) != -1) {
  while(($s=index($_,$from,$nxt)) != -1) {
   substr($_,$s,$fromlen,$to);
   $nxt=$s+$tolen;
  }
 }
 print;
}' 'sathya' '123' 'S@THYA01' infile

The first argument (sathya in this case) is the "string" which should be present in the line to attempt substitution.
The second argument (123 here) is the "string" you want to search for.
The third argument (S@THYA01 here) is the replacement "string".
The fourth argument (infile here) is the file to be changed.
Backup of the original file will be taken with .bak extension.
Last edited by elixir_sinari; 10-15-2012 at 05:24 AM..
This User Gave Thanks to elixir_sinari For This Post:
sathyaonnuix
 

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LEARN ABOUT DEBIAN

ldns_tcp_connect

ldns(3) 						     Library Functions Manual							   ldns(3)

NAME

       ldns_tcp_send_query, ldns_tcp_read_wire, ldns_tcp_connect-

SYNOPSIS

       #include <stdint.h>
       #include <stdbool.h>

       #include <ldns/ldns.h>

       ssize_t ldns_tcp_send_query(ldns_buffer *qbin, int sockfd, const struct sockaddr_storage *to, socklen_t tolen);

       uint8_t* ldns_tcp_read_wire(int sockfd, size_t *size);

       int ldns_tcp_connect(const struct sockaddr_storage *to, socklen_t tolen, struct timeval timeout);

DESCRIPTION

       ldns_tcp_send_query() send a query via tcp to a server. Don't want for the answer

	      qbin: the buffer to send
	      sockfd: the socket to use
	      to: which ip to send it
	      tolen: socketlen
	      Returns number of bytes sent

       ldns_tcp_read_wire() This routine may block. Use ldns_tcp_read_wire_timeout, it checks timeouts.  Gives back a raw packet from the wire and
	      reads the header data from the given socket. Allocates the data (of size size) itself, so don't forget to free

	      sockfd: the socket to read from
	      size: the number of bytes that are read
	      Returns the data read

       ldns_tcp_connect() Create a tcp socket to the specified address
	      to: ip and family
	      tolen: length of to
	      timeout: timeout for the connect attempt
	      Returns a socket descriptor

AUTHOR

       The ldns team at NLnet Labs. Which consists out of Jelte Jansen and Miek Gieben.

REPORTING BUGS

       Please report bugs to ldns-team@nlnetlabs.nl or in our bugzilla at http://www.nlnetlabs.nl/bugs/index.html

COPYRIGHT

       Copyright (c) 2004 - 2006 NLnet Labs.

       Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       ldns_send, ldns_pkt, ldns_resolver.  And perldoc Net::DNS, RFC1034, RFC1035, RFC4033, RFC4034  and RFC4035.

REMARKS

       This manpage was automaticly generated from the ldns source code by use of Doxygen and some perl.

								    30 May 2006 							   ldns(3)
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