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Full Discussion: awk to add text to matching pattern in field
Top Forums Shell Programming and Scripting awk to add text to matching pattern in field Post 303011798 by Don Cragun on Tuesday 23rd of January 2018 08:43:47 PM
Old 01-23-2018
Your code had four minor bugs. If you change what you showed us in post #1 to:
Code:
awk '
BEGIN { FS=OFS="\t" }  # define FS and OFS as tab and start processing
$9 ~ /NM/ {            # look for pattern NM in $9
	# split $9 by ";" and cycle through them
	out=""   # array out is empty
	i=split($9,NM,/;/)
	for (n=1; n<=i; n++) {
		sub(/$/, ":p=?", NM[n])   # add ":p=?" to end off each NM[i]
		out = (out=="" ? "" : out";") NM[n]  # add updated NM[i] to new output string, restoring ";"s.
	}
	$9 = out  # replace field #9 with updated output string
}1' file

you'll get the output you wanted.

But, rdrtx1's code is easier to read and probably faster. Some of your comments on rdrtx1's code are a little bit off. Try changing:
Code:
       gsub(";", ":p=?;", $9);  # split by ; in $9
       sub("$", ":p=?", $9);  # add :p=? to end of each split by ;

to:
Code:
       gsub(";", ":p=?;", $9);  # prepend ":p=?" to each of the subfield separators.
       sub("$", ":p=?", $9);  # add ":p=?" to end of the last subfield

 

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LEARN ABOUT MOJAVE

split

SPLIT(1)						    BSD General Commands Manual 						  SPLIT(1)

NAME

     split -- split a file into pieces

SYNOPSIS

     split [-a suffix_length] [-b byte_count[k|m]] [-l line_count] [-p pattern] [file [name]]

DESCRIPTION

     The split utility reads the given file and breaks it up into files of 1000 lines each.  If file is a single dash ('-') or absent, split reads
     from the standard input.

     The options are as follows:

     -a suffix_length
	     Use suffix_length letters to form the suffix of the file name.

     -b byte_count[k|m]
	     Create smaller files byte_count bytes in length.  If ``k'' is appended to the number, the file is split into byte_count kilobyte
	     pieces.  If ``m'' is appended to the number, the file is split into byte_count megabyte pieces.

     -l line_count
	     Create smaller files n lines in length.

     -p pattern
	     The file is split whenever an input line matches pattern, which is interpreted as an extended regular expression.	The matching line
	     will be the first line of the next output file.  This option is incompatible with the -b and -l options.

     If additional arguments are specified, the first is used as the name of the input file which is to be split.  If a second additional argument
     is specified, it is used as a prefix for the names of the files into which the file is split.  In this case, each file into which the file is
     split is named by the prefix followed by a lexically ordered suffix using suffix_length characters in the range ``a-z''.  If -a is not speci-
     fied, two letters are used as the suffix.

     If the name argument is not specified, the file is split into lexically ordered files named with the prefix ``x'' and with suffixes as above.

ENVIRONMENT

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

EXIT STATUS

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

SEE ALSO

     csplit(1), re_format(7)

STANDARDS

     The split utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     A split command appeared in Version 3 AT&T UNIX.

BUGS

     The maximum line length for matching patterns is 65536.

BSD
								  August 21, 2005							       BSD
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