As Corion says, Lack of bash interpolation is the problem.

to fix, try: 

perl -pe 's%REPLACE_HERE%'$p'%g' abc.txt > $p

[download]
Which gets the $p outside the single quotes. (untested)

        "You're only given one little spark of madness. You mustn't lose it."         - Robin Williams

In reply to Re: Perl in Bash by NetWallah
in thread Perl in Bash by khiawyen

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