How to select lines between two marker patterns which may occur multiple times with awk sed

Question

Using awk or sed how can I select lines which are occurring between two different marker patterns  There may be multiple sections marked with these patterns   For example   Suppose the file contains    abc def1 ghi1 jkl1 mno abc def2 ghi2 jkl2 mno pqr stu   And the starting pattern is abc and ending pattern is mno So  I need the output as    def1 ghi1 jkl1 def2 ghi2 jkl2   I am using sed to match the pattern once    sed -e  1  abc d  -e   mno   d   lt FILE gt    Is there any way in sed or awk  to do it repeatedly until the end of file

User · Answer

I tried to use awk to print lines between two patterns while pattern2 also match pattern1  And the pattern1 line should also be printed    e g  source   package AAA aaa bbb ccc package BBB ddd eee package CCC fff ggg hhh iii package DDD jjj   should has an ouput of  package BBB ddd eee   Where pattern1 is package BBB  pattern2 is package  w   Note that CCC isn t a known value so can t be literally matched   In this case  neither  scai  s awk   abc  a 1  mno  print a 0 a  file nor  fedorqui  s awk   abc  a 1  a   mno  a 0   file works for me   Finally  I managed to solve it by awk   package BBB  flag 1 print next  package  w   flag 0 flag  file  haha  A little more effort result in awk   package BBB  flag 1 print next flag  package  w   flag 0   file  to print pattern2 line also  that is   package BBB ddd eee package CCC

User · Answer

Use awk with a flag to trigger the print when necessary     awk   abc  flag 1 next  mno  flag 0 flag  file def1 ghi1 jkl1 def2 ghi2 jkl2   How does this work     abc  matches lines having this text  as well as  mno  does     abc  flag 1 next  sets the flag when the text abc is found  Then  it skips the line     mno  flag 0  unsets the flag when the text mno is found  The final flag is a pattern with the default action  which is to print  0  if flag is equal 1 the line is printed    For a more detailed description and examples  together with cases when the patterns are either shown or not  see How to select lines between two patterns

User · Answer

sed    abc     mno   d   d  file   golfs two characters better than ppotong s     b  d  The empty forward slashes    mean   reuse the last regular expression used   and the command does the same as the more understandable   sed    abc     mno   d   abc  d   mno  d  file   This seems to be POSIX      If an RE is empty  that is  no pattern is specified  sed shall behave as if the last RE used in the last command applied  either as an address or as part of a substitute command  was specified

User · Answer

Don crissti s answer from Show only text between 2 matching pattern   firstmatch  abc  secondmatch  cdf  sed    firstmatch    secondmatch  d   d  infile   which is much more efficient than AWK s application  see here

User · Answer

perl -lne  print if   abc    mno    amp  amp     abc    mno     your file

User · Answer

This might work for you  GNU sed    sed    abc     mno      b  d  file   Delete all lines except for those between lines starting abc and mno

User · Answer

From the previous response s links  the one that did it for me  running ksh on Solaris  was this   sed  1  firstmatch d  secondmatch   d     1  firstmatch d  from line 1 until the first time you find firstmatch  delete   secondmatch   d  from the first occurrance of secondmatch until the end of file  delete  Semicolon separates the two commands  which are executed in sequence

User · Answer

Using sed   sed -n -e    abc     mno      abc  d    mno  d  p       The -n option means do not print by default   The pattern looks for lines containing just abc to just mno  and then executes the actions in the           The first action deletes the abc line  the second the mno line  and the p prints the remaining lines   You can relax the regexes as required   Any lines outside the range of abc  mno are simply not printed

User · Answer

something like this works for me   file awk   BEGIN       record 0      abc         record 1      mno         record 0      print  s  s      s          abc mno         if  record  1            s   s  n  0              using  awk -f file awk data     edit  O o fedorqui solution is way better prettier than mine

[shell] How to select lines between two marker patterns which may occur multiple times with awk/sed

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