perl - How to print all lines except the line before a pattern in file using awk -

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how can awk?

input file

line 1 line 2 ####pattern####### (line 3) line 4 line 5 line 6 ####pattern####### (line 7) line 8 ####pattern####### (line 9)

etc..

output file

line 1 line 3 line 4  line 5 line 7 line 9

here 1 way awk:

awk '/pattern/{for(;i<nr-2;)print lines[++i];i=nr;delete lines;print $0}{lines[nr]=$0}' file

output:

$ cat file line 1 line 2 ####pattern####### (line 3) line 4 line 5 line 6 ####pattern####### (line 7) line 8 ####pattern####### (line 9) $ awk '/pattern/{for(;i<nr-2;)print lines[++i];i=nr;delete lines;print $0}{lines[nr]=$0}' file line 1 ####pattern####### (line 3) line 4 line 5 ####pattern####### (line 7) ####pattern####### (line 9)

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