4 chars shorter: 

perl -ne'print,last,if$.==4'
     12345678901234567890123  23

[download]

Update: 5 chars shorter: 

perl -nlE'say,last,if$.==4'
     1234567890123456789012  22

[download]

In reply to Re^2: perl one liner to print a line by ikegami
in thread perl one liner to print a line by sugar

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