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Help need on cat command

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# 1  
Old 01-24-2013
Help need on cat command
I have two files as below

1.txt

Code:
AA 123
CC 145
DD 567

2.txt

Code:
AA 111
YY 128
CC 144
FF 222
DD 777
ZZ 875

basically 1.txt is updated file, if i do cat 1.txt 2.txt output should be as below
o/p
Code:
 
AA 123
YY 128
CC 145
FF 222
DD 567
ZZ 875

basically 1.txt should override on 2.txt
Please share inputs if some one knows..
Last edited by joeyg; 01-24-2013 at 01:12 PM.. Reason: Please wrap commands and data with CodeTags
# 2  
Old 01-24-2013
cat is an existing command with a specific meaning, different to that you require.

try something like the following instead
Code:
 perl -ne '$entry{$1}=$2 if /^([^\s]+)\s([^\s]+)$/; END{for (sort keys %entry){print "$_ $entry{$_}\n";}}' tmp/2.txt tmp/1.txt
AA 123
CC 145
DD 567
FF 222
YY 128
ZZ 875

A few points to note, the records will be printed sorted on the first field.
The latest file should be provided last (the command will deal with more than 2 files)
# 3  
Old 01-24-2013
try also:
Code:
awk 'NR==FNR {a[$1]=$0; next} a[$1] {$0=a[$1]} 1' 1.txt 2.txt

# 4  
Old 01-24-2013
awk 'NR==FNR {a[$1]=$0; next} a[$1] {$0=a[$1]} 1' 1.txt 2.txt
awk: syntax error near line 1
awk: bailing out near line 1

any idea..
# 5  
Old 01-24-2013
Use nawk on solaris.
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