Delete duplicate strings in a line

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# 8  
Old 12-12-2013
substr($1,2) ---> if your input is &aff2g0440 after using substr($1,2) you will get aff2g0440 second char onwards from column 1 and it searches for exact match in column2, if condition is true,

$2 = x ---> since x is not set, its NULL so field will be masked here(or empty field2)

$0 = $0 ---> recalculate field

$1=$1 ---> recalculate record, and remove space


}1 --> 1 is true 0 is false since its one so prints all the line
This User Gave Thanks to Akshay Hegde For This Post:
# 9  
Old 12-12-2013
Hi Akshay,

thanks so much!! your explanation is simple and clear Smilie
# 10  
Old 01-23-2014
one more approach for awk.

cat <<eof | awk '{gsub(/\&/,X)}  $1==$2 {$2=X;$1="&"$1}1'
&aff2g0440 aff2g0440 aspl2221 nos:scad1 blablablabla
&aff2g0740 aff2g0740 aspl5221 nos:scad1 blablablabla
&aff4g0160 aff4g01600 aspl2251 nos:scad1 blablablabla
&aff9g0020 aff9g0020 aspl3391 nos:scad2 blablablabla

Output will be as follows.

&aff2g0440  aspl2221 nos:scad1 blablablabla
&aff2g0740  aspl5221 nos:scad1 blablablabla
aff4g0160 aff4g01600 aspl2251 nos:scad1 blablablabla
&aff9g0020  aspl3391 nos:scad2 blablablabla

R. Singh
# 11  
Old 01-23-2014
@ravinder, that is UUOC ... compare:

awk ... <<eof

The awk's gsub will delete all ampersands on the line (instead of the first character ampersand in $1), which happens to work with the given input..

Last edited by Scrutinizer; 01-23-2014 at 06:08 PM..
# 12  
Old 01-23-2014
Thank you Scrutinizer for correcting me. Smilie
# 13  
Old 01-23-2014

Desired output is not the one which you have shown. please read what is thread is about and all answers (if answered earlier) before you reply something.
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