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Top Forums UNIX for Dummies Questions & Answers Replace some strings keeping others Post 302920770 by senhia83 on Sunday 12th of October 2014 06:14:42 PM
Old 10-12-2014
Replace some strings keeping others

I want to replace strings in test2 according to test1 table. In doing so, I`m losing records that I dont need to replace, please suggest modifications.

what i have

Code:
 
$ cat > test1
a b
c d
 
$ cat > test2
a
a
a
d
d
 
what i tried 
 
$ awk ' BEGIN {FS=OFS=" "} FNR==NR{a[$1]=$2;next} $1 in a{print a[$1]}' test1 test2
b
b
b



what i want

Code:
 
 
b
b
b
d
d



 

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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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