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Full Discussion: Extract specific content from a file
Top Forums Shell Programming and Scripting Extract specific content from a file Post 302359673 by radoulov on Wednesday 7th of October 2009 06:54:09 AM
Old 10-07-2009
Use gawk, nawk or /usr/xpg4/bin/awk on Solaris:

Code:
awk 'END { if (r ~ p) print r }
/^>sequence/ { if (r ~ p) print r; r = x }
{ r = (r ? r RS : x) $0 }
' p="sequence_2" infile



---------- Post updated at 12:47 PM ---------- Previous update was at 12:41 PM ----------

Yes,
thegeek's sed approach should be faster.
Assuming progressive sequence numbers with fixed format,
you could add parameters:

Code:
start="sequence_2"
stop="$(( ${start##*_} + 1 ))"

sed -n "
  /$stop/q
  /$start/,/$stop/p
  " infile



---------- Post updated at 12:51 PM ---------- Previous update was at 12:47 PM ----------

A similar approach with awk:
Code:
awk '$0 ~ stop { exit }
  $0 ~ start, $0 ~ stop {
    if ($0 !~ stop) print 
    }' start="sequence_2" \
stop="$(( ${start##*_} + 1 ))" infile



---------- Post updated at 12:54 PM ---------- Previous update was at 12:51 PM ----------

Notice that the sed and the second awk versions assume an input in numeric (by sequence number) order just like the example in the original post.
 

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LEARN ABOUT MOJAVE

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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