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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 V7

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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