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Top Forums Shell Programming and Scripting awk to replace second occurance Post 302400703 by cjjoy on Thursday 4th of March 2010 12:57:44 AM
Old 03-04-2010
awk to replace second occurance

Code:
#original file
.
.
~
~
Index=2  
xxx
replace  #dont replace 1st occurance
yyy
Index=2
xxx
replace  #substitue replace with "REPLACE"
yyy
Index=2
xxx
replace #substitue replace with "REPLACE"
yyy
Index=3
xxx
replace 
yyy

Code:
Expected output file:

.
.
~
~
Index=2
xxx
replace  
yyy
Index=2
xxx
REPLACE  
yyy
Index=2
xxx
REPLACE  
yyy
Index=3
xxx
replace 
yyy


Hi,

This is the simiplified file I am working on.. I need to :
1. search for 2nd occurance of a string pattern ("Index=2"in file)
2. Go forward 2 lines after this
3. Replace current line with new pattern (ex: "REPLACE" )



I am using awk for checking the 2nd oocurance, but dont know
how to step 2 lines forward and replace the string.

Code:
#awk.sh

/Index=2/{
   mcount++
   if(mcount == 2){
      {print NR+2}
      #need to substitute NR+2
   }
}

 

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REPLACE(1)						       MySQL Database System							REPLACE(1)

NAME
replace - a string-replacement utility SYNOPSIS
replace arguments DESCRIPTION
The replace utility program changes strings in place in files or on the standard input. Note The replace utility is deprecated as of MySQL 5.7.18 and is removed in MySQL 8.0. Invoke replace in one of the following ways: shell> replace from to [from to] ... -- file_name [file_name] ... shell> replace from to [from to] ... < file_name from represents a string to look for and to represents its replacement. There can be one or more pairs of strings. Use the -- option to indicate where the string-replacement list ends and the file names begin. In this case, any file named on the command line is modified in place, so you may want to make a copy of the original before converting it. replace prints a message indicating which of the input files it actually modifies. If the -- option is not given, replace reads the standard input and writes to the standard output. replace uses a finite state machine to match longer strings first. It can be used to swap strings. For example, the following command swaps a and b in the given files, file1 and file2: shell> replace a b b a -- file1 file2 ... replace supports the following options. o -?, -I Display a help message and exit. o -#debug_options Enable debugging. o -s Silent mode. Print less information what the program does. o -v Verbose mode. Print more information about what the program does. o -V Display version information and exit. COPYRIGHT
Copyright (C) 1997, 2018, Oracle and/or its affiliates. All rights reserved. This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/. SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/. AUTHOR
Oracle Corporation (http://dev.mysql.com/). MySQL 5.7 06/07/2018 REPLACE(1)
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