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Full Discussion: How to replace all but the first 3 characters with sed?
Top Forums Shell Programming and Scripting How to replace all but the first 3 characters with sed? Post 302934661 by wisecracker on Monday 9th of February 2015 05:08:54 PM
Old 02-09-2015
Longhand using OSX 10.7.5, default bash terminal...
Hard coded as '3' for this DEMO.
Code:
Last login: Mon Feb  9 22:00:29 on ttys000
AMIGA:barrywalker~> echo 'kajhd(*&&#$%^ASDFGHJ{}][!\\|\00
> 123131,.,xv.,c.,.?><lksdlfk
> abcd
> def
> a' > /tmp/txt
AMIGA:barrywalker~> while read -r line; do pad="${line:3}"; echo $line; echo -E "${line:0:3}${pad//[' '-~]/*}"; done < /tmp/txt
kajhd(*&&#$%^ASDFGHJ{}][!\\|\00
kaj****************************
123131,.,xv.,c.,.?><lksdlfk
123************************
abcd
abc*
def
def
a
a
AMIGA:barrywalker~> _

EDIT:
Post the correct copy and paste... ;o)
Last edited by wisecracker; 02-09-2015 at 06:21 PM.. Reason: See above.
 

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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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