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Full Discussion: Reading a file and replacing char by position
Top Forums Shell Programming and Scripting Reading a file and replacing char by position Post 302515214 by Shell_Life on Tuesday 19th of April 2011 12:05:56 PM
Old 04-19-2011
You asked to add/insert a string, this way the original data is incremented by the string and thus shifted.

If you do not want to have the data shifted, then you want to replace:
Code:
sed 's/\(.\{255\}\)..../\1ABCD/' Inp_File

This User Gave Thanks to Shell_Life For This Post:
macastor
 

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LEARN ABOUT HPUX

fwtmp

fwtmp(1M)																 fwtmp(1M)

NAME

       fwtmp, wtmpfix - manipulate connect accounting records

SYNOPSIS

       [files]

DESCRIPTION

   fwtmp
       reads from the standard input and writes to the standard output, converting binary records of the type found in to formatted ASCII records.
       The ASCII version is useful to enable editing, via ed(1), bad records or for general purpose maintenance of the file.

       The argument is used to denote that input is in ASCII form, and output is to be written in binary form.	The arguments and are independent,
       respectively specifying ASCII input and binary output.  Therefor, is an ASCII to ASCII copy and is a binary to binary copy.  should be used
       for reading If is not used, structure is read.

   wtmpfix
       examines the standard input or named files in format, corrects the time/date stamps to make the entries consistent, and writes to the stan-
       dard  output.  A can be used in place of files to indicate the standard input.  If time/date corrections are not performed, will fault when
       it encounters certain date-change records.

       Each time the date is set, a pair of date change records is written to The first record is the old date denoted	by  the  string  old  time
       placed  in the line field and the flag placed in the type field of the structure.  The second record specifies the new date, and is denoted
       by the string placed in the line field and the flag placed in the type field.  uses these records to synchronize all  time  stamps  in  the
       file.   nullifies date change records when writing to the standard output by setting the time field of the structure in the old date change
       record equal to the time field in the new date change record.  This prevents and from factoring in a date  change  record  pair	more  than
       once.

       In addition to correcting time/date stamps, wtmpfix checks the validity of the name field to ensure that it consists solely of alphanumeric
       characters or spaces.  If it encounters a name that is considered invalid, it changes the login name to and  writes  a  diagnostic  to  the
       standard error.	This minimizes the risk that will fail when processing connect accounting records.

DIAGNOSTICS

       wtmpfix generates the following diagnostics messages:

WARNINGS

       generates no errors, even on garbage input.

FILES

SEE ALSO

       ed(1),  acct(1M),  acctcms(1M),	acctcom(1M),  acctcon(1M),  acctmerg(1M), acctprc(1M), acctsh(1M), runacct(1M), acct(2), acct(4), utmp(4),
       wtmps(4).

STANDARDS CONFORMANCE

																	 fwtmp(1M)
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