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how to delete duplicate rows based on last column

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Top Forums Shell Programming and Scripting how to delete duplicate rows based on last column
# 15  
Old 09-01-2009
post sample input and expected output at least a few lines to test.
# 16  
Old 09-01-2009
The sample input is
Code:
 SIG  2007  3 24  4 35 45.80   5.2600  94.3100  58   0 5.20   0 0.00 5.00 0.00   0 0.00 5.20   0
 SSS  2007  3 24  9  3 37.40  36.5600  71.4800 152   0 4.70   0 0.00 0.00 0.00   0 0.00 4.70   0
 SIG  2008  3 25 18 29 33.15   1.7700  99.3400 163   0 4.60   0 0.00 0.00 0.00   0 0.00 4.60   0
 SEG  2008  3 25 18 27 35.06   1.7700  99.3400  89   0 5.00   0 0.00 0.00 0.00   0 0.00 5.00   0
PDE-Q 2009  7  2 22 36 45.17  37.4800  71.7400  20   0 4.60   0 0.00 0.00 0.00   0 0.00 4.60   0 
PDE-Q 2009  7  2 23 50 49.20  37.4800  71.7400 108   0 4.70   0 0.00 0.00 0.00   0 0.00 4.70   0 
PDE-Q 2009  7  3  4 42 32.83  34.4600  24.1200  41   0 4.50   0 0.00 0.00 0.00   0 0.00 4.50   0 
PDE-Q 2009  7  5  9 45 48.77  36.4600  71.0700 248   0 4.90   0 0.00 0.00 0.00   0 0.00 4.90   0
PDE-Q 2009  7  5 12 25 37.44   1.3300  99.7800 185   0 4.50   0 0.00 0.00 0.00   0 0.00 4.60   0
PDE-Q 2009  7  5 12 25 37.44   1.3300  99.7800 185   0 4.50   0 0.00 0.00 0.00   0 0.00 4.50   0
PDE-Q 2009  7  6 16  0 38.96   3.0400  93.3500  34   0 4.90   0 0.00 0.00 0.00   0 0.00 4.90   0
PDE-Q 2009  7  7  0 32 47.11  34.1600  25.5100  13   0 0.00   0 0.00 0.00 0.00   0 0.00 0.00   0
PDE-Q 2009  7  7  1  2  0.48  34.1600  25.5100  25   0 4.80   0 0.00 0.00 0.00   0 3.00 4.80   0

The sample output is
Code:
 SIG  2007  3 24  4 35 45.80   5.2600  94.3100  58   0 5.20   0 0.00 5.00 0.00   0 0.00 5.20   0
 SEG  2008  3 25 18 27 35.06   1.7700  99.3400  89   0 5.00   0 0.00 0.00 0.00   0 0.00 5.00   0
PDE-Q 2009  7  2 23 50 49.20  37.4800  71.7400 108   0 4.70   0 0.00 0.00 0.00   0 0.00 4.70   0 
PDE-Q 2009  7  3  4 42 32.83  34.4600  24.1200  41   0 4.50   0 0.00 0.00 0.00   0 0.00 4.50   0 
PDE-Q 2009  7  5  9 45 48.77  36.4600  71.0700 248   0 4.90   0 0.00 0.00 0.00   0 0.00 4.90   0
PDE-Q 2009  7  5 12 25 37.44   1.3300  99.7800 185   0 4.50   0 0.00 0.00 0.00   0 0.00 4.60   0
PDE-Q 2009  7  6 16  0 38.96   3.0400  93.3500  34   0 4.90   0 0.00 0.00 0.00   0 0.00 4.90   0
PDE-Q 2009  7  7  1  2  0.48  34.1600  25.5100  25   0 4.80   0 0.00 0.00 0.00   0 3.00 4.80   0

# 17  
Old 09-01-2009
something like this :
Code:
awk '{ if($1" "$2" "$3" "$4 in a) { if(va < $(NF-1)) {a[$1" "$2" "$3" "$4]=$0;va=$(NF-1);next}} else { a[$1" "$2" "$3" "$4]=$0;va=$(NF-1)}} END { for ( i in a) print a[i] }' file_name.txt | sort +1n
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