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Full Discussion: awk to update value based on pattern match in another file
Top Forums Shell Programming and Scripting awk to update value based on pattern match in another file Post 303003009 by MadeInGermany on Wednesday 6th of September 2017 02:09:02 PM
Old 09-06-2017
You need to cycle through each character, as you maybe intended in post#1; you need substr() to cut out a single character.
Code:
awk '
  BEGIN { OFS="\t" }
  # The input files are processed one by one and the following code runs for each line
  # FNR is equal to NR when processing file1
  # a[ ] is indexed by the one letter code, its value is the three letter code
  FNR==NR { a[$1]=$2; next }
  # The next goes to the next input cycle
  # The following code runs for file2 (and further files)
  ($12 ~ /:NM_/ && match($12,/p..*/)) {  # search for :NM_ and p..*
    # Get the substring after p.
    VAL=substr($12,RSTART+2)
    # Get its length
    lenVAL=length(VAL)
    ostring=""
    # Cycle through each character, append to ostring, if in a[ ] replace by its value
    for (i=1; i<=lenVAL; i++) {
      c=substr(VAL,i,1)
      ostring=(ostring ((c in a) ? a[c] : c))
    }
    # copy ostring back to $12 (unconditionally), retaining the part up to p.
    $12=(substr($12,1,RSTART+1) ostring)
  }
  # always print
  { print }
' file1 FS="\t" file2

I have reverted to define FS after reading file1, because file1 might not be TAB-separated.
This User Gave Thanks to MadeInGermany For This Post:
cmccabe
 

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LEARN ABOUT PLAN9

tr

TR(1)							      General Commands Manual							     TR(1)

NAME

       tr - translate characters

SYNOPSIS

       tr [ -cds ] [ string1 [ string2 ] ]

DESCRIPTION

       Tr  copies  the standard input to the standard output with substitution or deletion of selected characters (runes).  Input characters found
       in string1 are mapped into the corresponding characters of string2.  When string2 is short it is padded to the length of string1 by  dupli-
       cating its last character.  Any combination of the options -cds may be used:

       -c     Complement string1: replace it with a lexicographically ordered list of all other characters.

       -d     Delete from input all characters in string1.

       -s     Squeeze repeated output characters that occur in string2 to single characters.

       In  either  string a noninitial sequence -x, where x is any character (possibly quoted), stands for a range of characters: a possibly empty
       sequence of codes running from the successor of the previous code up through the code for x.  The character followed by 1,  2  or  3  octal
       digits  stands for the character whose 16-bit value is given by those digits.  The character sequence followed by 1, 2, 3, or 4 hexadecimal
       digits stands for the character whose 16-bit value is given by those digits.  A followed by any other character stands for that character.

EXAMPLES

       Replace all upper-case ASCII letters by lower-case.

	      tr A-Z a-z <mixed >lower

       Create a list of all the words in one per line in where a word is taken to be a maximal string of  alphabetics.	 String2  is  given  as  a
       quoted newline.

	      tr -cs A-Za-z '
	      ' <file1 >file2

SOURCE

       /sys/src/cmd/tr.c

SEE ALSO

       sed(1)

																	     TR(1)
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