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Full Discussion: How to replace a text in a file conditionally?
Top Forums Shell Programming and Scripting How to replace a text in a file conditionally? Post 302557341 by asutoshch on Wednesday 21st of September 2011 12:58:14 AM
Old 09-21-2011
How to replace a text in a file conditionally?
I have got about 100 ascii files and I want replace some variable with a new one on an HP-UX system. But I want to put a line of comments before the change. I want to make file1 to file2. I am explaining below.
file1:
Code:
line1
line2
export QNAME=ABC
line4
line5

file2:
Code:
line1
line2
# the below line is changes on 09/21
#export QNAME=ABC
export QNAME=XYZ
line4
line5

The line export QNAME is not always like export QNAME. But it will have the string ABC. Basically the catch is ABC will be replaced with XYZ - everything else remains same.

Can someone tell me a nice way of doing that ? Thank you very much.
 

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LEARN ABOUT OPENSOLARIS

replace

replace(1)							  MySQL database							replace(1)

NAME

       replace	-  A utility program that is used by msql2mysql, but that has more general applicability as well. replace changes strings in place
       in files or on the standard input. Uses a finite state machine to match longer strings first. Can be used to swap strings.

USAGE

       replace [-?svIV] from to from to ... -- [files]

       or

       replace [-?svIV] from to from to ... < fromfile > tofile

SYNOPSIS

       replace [-?|-I] [-s] [-v]

DESCRIPTION

       replace

       -?|-I  info

       -s     silent

       -v     verbose

EXTRA INFO

       Special characters in from string:

       ^     Match start of line.

       $     Match end of line.

            Match space-character, start of line or end of line. For a end  the next replace starts locking at the end space-character.  A	
	      alone in a string matches only a space-character.

EXAMPLE

       this command swaps a and b in the given files:

       shell> replace a b b a -- file1 file2 ...

SEE ALSO

       isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
       lege_tables(1), mysqlshow(1), mysql_zap(1), perror(1),

       For more information please refer to the MySQL reference manual, which may already be installed locally and which is also available  online
       at http://www.mysql.com/doc/en/

BUGS

       Please refer to http://bugs.mysql.com/ to report bugs.

AUTHOR

       Ver  1.0,  distribution	4.0.24	Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/).  This software comes with no
       warranty.  Manual page by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer  (http://www.mercur-
       media.com)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+------------------------------------+
       |  ATTRIBUTE TYPE    |	       ATTRIBUTE VALUE		 |
       +--------------------+------------------------------------+
       |Availability	    | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt |
       +--------------------+------------------------------------+
       |Interface Stability | External				 |
       +--------------------+------------------------------------+
NOTES

       Source for mysql is available on http://opensolaris.org.

MySQL 4.0							 19 December 2000							replace(1)
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