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Full Discussion: Replace nth to nth character?
Top Forums Shell Programming and Scripting Replace nth to nth character? Post 302949528 by Aia on Sunday 12th of July 2015 07:25:42 PM
Old 07-12-2015
Code:
sed 's/\(.\{16\}\).\{16\}/\1AAAAAAAA/' file

The cat command is not necessary since sed can read a file on its own.
The red part is matching another 16 characters, and when you \1 those 16 matched chars are discarded and replaced by AAAAAAAA.
Code:
sed 's/\(.\{16\}\).\{8\}/\1AAAAAAAA/' file

The red part has to be the same length of the substitution if you do not want to truncate the original line any farther.

---------- Post updated at 05:25 PM ---------- Previous update was at 05:02 PM ----------

You can do it with many other programs, however I prefer Perl.

Code:
perl -pe 'substr($_, 16, length "AAAAAAAA") = "AAAAAAAA"' file

4040AB50025D8843AAAAAAAA0000E5020046904444047FD76A029E8009E8B387C19C7FA44E2842B1D6229383502608435A552D1A5D...

Last edited by Aia; 07-12-2015 at 08:45 PM..
This User Gave Thanks to Aia For This Post:
stinkefisch
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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