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Top Forums UNIX for Beginners Questions & Answers Grep lines between two specific words after matching pattern Post 303044349 by sagar_1986 on Thursday 20th of February 2020 01:36:10 AM
Old 02-20-2020
Hello RavinderSingh13 ,


Actually i know how to get 'n' ( fixed) number of lines before and after the matching pattern, but here the issue is that position of 'start' and 'end' is not fixed.
Here i want to grep first occurrence of 'start' before matching pattern and first occurrence of 'end' after matching pattern and i don't have any idea how to do this, could you please help.
 

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copt(1) 							z88 Development Kit							   copt(1)

NAME
copt - peephole optimizer SYSNOPIS
copt file ... DESCRIPTION
copt is a general-purpose peephole optimizer. It reads code from its standard input and writes an improved version to its standard output. copy reads the named files for its optimizations, which are encoded as follows: <pattern for input line 1> <pattern for input line 2> ... <pattern for input line n> = <pattern for output line 1> <pattern for output line 2> ... <pattern for output line m> <blank line> Pattern matching uses literal string comparison, with one exception: ``%%'' matches the ``%'' character, and ``%'' followed by a digit matches everything up to the next occurrence of the next pattern character, though all occurrences of %n must denote the same string. For example, the pattern ``%1=%1.'' matches exactly those strings that begin with a string X, followed by a ``='' (the first), followed by a second occurrence of X, followed by a period. In this way, the input/output pattern mov $%1,r%2 mov *r%2,r%2 = mov %1,r%2 commands copt to replace runs like mov $_a,r3 mov *r3,r3 with mov _a,r3 Note that a tab or newline can terminate a %n variable. copt compares each run of input patterns with the current input instruction and its predecessors. If no match is found, it advances to the next input instruction and tries again. Otherwise, it replaces the input instructions with the corresponding output patterns, pattern vari- ables instantiated,and resumes its search with the first instruction of the replacement. copt matches input patterns in reverse order to cascade optimizations without backing up. BUGS
Errors in optimization files are always possible. SEE ALSO
z88dk(1), z88dk-zcc(1), z88dk-z80asm(1), z88dk-appmake(1), z88dk-copt(1). AUTHOR
z88dk was written by Dominic Morris <dom@z88dk.org>, and others. 01 December 2009 copt(1)

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