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Top Forums UNIX for Dummies Questions & Answers Extracting data between specific lines, multiple times Post 302749903 by Don Cragun on Sunday 30th of December 2012 01:35:10 AM
Old 12-30-2012
If I understand the requirements correctly: print all lines between two lines that consist of exactly one space character followed by 83 hyphens if and only if the starting line of hyphens immediately follows a line starting with POSITION, and skip all other lines (including the hyphen lines and the POSITION line); the following awk script should do what you want:
Code:
awk '/^POSITION/ {
        dn = 1  # We expect a line of dashes next.
        next    # Skip to next line.
}
/^ -----------------------------------------------------------------------------------$/ {
        if(dn) {
                # This is a dashes line immediately after a POSITION line.
                dn = 0          # We are no longer looking for starting dashes.
                copy = 1        # Turn on copy mode.
        } else  copy = 0        # We found another line of dashes. Stop copying.
        next    # Skip to next line.
}       
dn {    dn = 0 # We expected a line of dashes but did not find it.  Reset.
        next    # Skip to next line.
}
copy {  print   # If we are in copy mode, print the line.
}' inputfile

If you are using a Solaris system, use /usr/xpg4/bin/awk or nawk instead of awk.
 

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JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis- carded. These options are recognized: -an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -e s Replace empty output fields by string s. -jn m Join on the mth field of file n. If n is missing, use the mth field in each file. -o list Each output line comprises the fields specified in list, each element of which has the form n.m, where n is a file number and m is a field number. -tc Use character c as a separator (tab character). Every appearance of c in a line is significant. SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort. The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous. 7th Edition April 29, 1985 JOIN(1)
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