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Full Discussion: Selective replace
Top Forums UNIX for Dummies Questions & Answers Selective replace Post 302758509 by siya@ on Sunday 20th of January 2013 12:37:09 AM
Old 01-20-2013
Just an addition to this post
if my sequence looks like this

Code:
string_8540       .       FFF     1       15501   .       .       .       ID=sat_1_g3_g_0_8540

string_8510       .       FFF     1       25501   .       .       .       ID=sat_1_g3_g_2_8510

and I want to replace the third column(ie replace FFF) by seq .

how can i replace only a particular column .. should i use a tab option

"sed \t "

Thanks

---------- Post updated at 07:37 PM ---------- Previous update was at 07:35 PM ----------

I only want to replace the 3rd column entries (FFF by seq)

There might be other places where FFF might be present in the file .I dont want to replace them.

I hope I m not confusing.

ThanksSmilie

Last edited by Scrutinizer; 01-20-2013 at 02:12 AM.. Reason: code tags
 

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REPLACE(1)						      General Commands Manual							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), mysqlaccess (1), mysqladmin (1), mysqlbug (1), mysqld (1), mysqldump (1), mysqlshow (1), msql2mysql (1), perror (1), replace (1), safe_mysqld (1), which1 (1), zap (1), AUTHOR
Ver 1.0, distribution 3.23.29a Michael (Monty) Widenius (monty@tcx.se), TCX Datakonsult AB (http://www.tcx.se). 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.mer- curmedia.com) 20 December 2000 REPLACE(1)
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