Re: file editing

From: Eric Pement (pemente_at_northpark.edu)
Date: 08/16/04

  • Next message: Doug Freyburger: "Re: cannot read tar archive from tape: directory checksum error" 
    Date: 16 Aug 2004 10:50:30 -0700

    veshee@hotmail.com (Joey) wrote in message news:<fd9ccebb.0408160227.d98b922@posting.google.com>...

    > i want to edit only the line beginig with a 'P' os 'S'
    > the other must stay the same
    >
    > This result should be output to another file
    >
    > This is my attempt, the editing works fine , but i can get to print
    > the rest f the lines in the file unchanged
    >
    > -------------

    [ ... deletion ... ]
    > awk '/^P/ {
    > rem1=NR % 2
    > id=substr($0,1,1);
    > sequence=substr($0,2,4);
    > name=substr($0,6,33);
    > house=substr($0,39,38);
    > street=substr($0,77,4);
    > cycle=substr($0,81,2);
    > walk=substr($0,83,3);
    > read=substr($0,86,63);
    > filler=substr($0,149,42);
    > period=substr($0,191,2);
    > time=substr($0,193,2);
    > if (rem1 == 0)
    > {
    > printf("%s%sMR A CUSTOMER %s%s%s%s%s%s%s%s\n",id,
    > sequence, house, street, cycle, walk, read, filler, period, time);
    > }
    > else
    > {
    > printf("%s%sMRS A DCD %s%s%s%s%s%s%s%s\n",id,
    > sequence, house, street, cycle, walk, read, filler, period, time);
    > }
    > }' $IN_FILE
    > #
    >
    > -------------
    > Thanks in advance

    Your task would have been easier had you learned about the FIELDWIDTHS
    variable. Maybe you don't have access to gawk. At any rate, the
    solution is to simply address the other, nonmatching lines of the
    file:

       awk '/^P/ { # print lines that begin with P
         ... your script here ...
       }
       /^[^P]/ # print lines that begin with non-P
       /^$/ # print blank lines also (optional)
       ' $IN_FILE

    By specifying a "/pattern/" with no "{action}", the default action is
    to print the lines that match the pattern. You also have the option of
    printing or omitting blank lines from the output. 

    -- 
Eric Pement
  • Next message: Doug Freyburger: "Re: cannot read tar archive from tape: directory checksum error"

    Relevant Pages

    • Re: file editing
      ... > sequence, house, street, cycle, walk, read, filler, period, time); ...
      (comp.unix.shell)
    • Re: file editing
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    • Re: file editing
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    • file editing
      ... I am tryung to edit a file with fix length fields ... sequence, house, street, cycle, walk, read, filler, period, time); ...
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