Hi,
Be aware of the subtle difference between: 

perl -ne'/(data)/ && print $1 and last' file.txt

perl -ne'/(data)/ && print $1 && last' file.txt

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Of course, I saw the subtle difference, and how you used 
.. print ($1) ...

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the parentheses which is effectively the same thing if "and" is used instead of "&&"
check this:

Using
perl -MO=Deparse -ne'/(data)/ && print $1 && last' file.txt

[download]
you gets: 
LINE: while (defined($_ = <ARGV>)) {
    print $1 && last if /(data)/;
}

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but using 
perl -MO=Deparse -ne'/(data)/ && print ($1) && last' file.txt

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gives: 
LINE: while (defined($_ = <ARGV>)) {
    last if /(data)/ and print $1;
}

[download]
Which is same as this:
perl -MO=Deparse -ne'/(data)/ && print $1 and last' file.txt

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LINE: while (defined($_ = <ARGV>)) {
    last if /(data)/ and print $1;
}

[download]

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re^3: Break one liner command line script after first match by 2teez
in thread Break one liner command line script after first match by saumitra121

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