Yes, i got fixed with this and i made unsuccesfull tries using eof..eof flip-flop to process even files..
anyway now i get two semi-obfuscated oneliners, the first, simpler, is called with a single arg (the name of file): 
# $y is <C>yet</C> set for the second read, @u is <C>unwanted</C> <P>

perl -lnE "BEGIN{push @ARGV,$ARGV[0]}eof&&!$y?$y=close ARGV:/XXXXX/&&!
+$y?push @u,$.-1..$.+1:$y&&!($.~~@u)?say:0" next-and-previous.txt
11111
22222
33333
44444<P>

[download]
while the latter is parametrizable one: firts arg is the regex used to match unwanted strings, the second is the number of lines to be removed after and before and then the filename: 
perl -lnE "BEGIN{$r=shift;$r=qr/$r/;$n=shift@ARGV;push @ARGV,$ARGV[0]}
+eof&&!$y?$y=close ARGV:/$r/&&!$y?push @u,$.-$n..$.+$n:$y&&!($.~~@u)?s
+ay:0" XXXXX 1 next-and-previous.txt
11111
22222
33333
44444

perl -lnE "BEGIN{$r=shift;$r=qr/$r/;$n=shift;push @ARGV,$ARGV[0]}eof&&
+!$y?$y=close ARGV:/$r/&&!$y?push @u,$.-$n..$.+$n:$y&&!($.~~@u)?say:0"
+ XXXXX 2 next-and-previous.txt
22222

[download]

I promise i'll try to no bother you anymore with this.. :=)

update the parametrized oneliner can be shortend using -s switch (that has some problem anyhow) It is the second time i use -- too. 

perl -slnE "BEGIN{$r=qr/$r/;push @ARGV,$ARGV[0]}eof&&!$y?$y=close ARGV
+:/$r&&!$y?push@u,$.-$n..$.+$n:$y&&!($.~~@u)?say:0"  
           -- -r=XXXXX -n=1 next-and-previous.txt

11111
22222
33333
44444

[download]

L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re: how to check for a word in a file and if found remove previous and next -- 3 oneliner variations by Discipulus
in thread how to check for a word in a file and if found remove that line, the above line and the below line from the file. by Ganesh Bharadwaj1

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