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To back up what my learned friend RudiC says, the reason is that the underscore is not seen as delimiting the end of the variable. It is an allowable character in the variable name, so you will end...

Enclose the x variable expansion in braces, like ..._${x}_....

Hello rramkrishnas,

I am not sure the output you have shown which shows us leading spaces are uneven, so if you need exact output as you have shown us then following may be helpful to you.

awk...

Hello rramkrishnas,

Could you please try following and let me know if this helps you.
Let's say following is the Input_file:

cat Input_file
<Node>xxxxxx
<Node>yyyyy</Node>
<Node>zzzzzz...

awk 'BEGIN{print "file name","out.txt"}FNR>1{print FILENAME":"$0}' *.txt

Try

!
)

try below code

awk -F"," 'NR==FNR{a[$1]=$0;next} a[$1] {a[$1]=a[$1]","$2","$3} END {for (i in a) { print a[i]}}' file1 file2 file3 | sed 's/,$//g' | sort -t"," -k1 -n

Please use code tag and provide desire o/p in proper format.