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Full Discussion: Replacing one Char in a string of variable length
Top Forums Shell Programming and Scripting Replacing one Char in a string of variable length Post 302338290 by nkwilliams on Monday 27th of July 2009 12:48:07 PM
Old 07-27-2009
Replacing one Char in a string of variable length
Hi all,

I am trying to find the best way of making a change to 1 char in a string, the string can be between 1 and 14 characters.

I am reading a line in from a file which contains
012341231231:2:102939283:NNN: Require :NBN:
012838238232:3:372932:NNN: Require :NNB:
I need to change 1 N or a B depending on the number in the 2nd field (a 2 or a 3 in the cases above).

Now each character in the NNN field could initially be N,C,B, or 2 or 3 other characters.

At the moment I can only think of looping around each character using a cut -c to write out each character as it already is then changing the one I want when I get to it, but I was hoping there could be a better and more efficient way.

I am using Redhat Ent 4 with ksh

Thanks in advance

Nigel...
 

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LEARN ABOUT XFREE86

printf

PRINTF(1)                                                          User Commands                                                         PRINTF(1)

NAME

       printf - format and print data

SYNOPSIS

       printf FORMAT [ARGUMENT]...
       printf OPTION

DESCRIPTION

       Print ARGUMENT(s) according to FORMAT, or execute according to OPTION:

       --help display this help and exit

       --version
              output version information and exit

       FORMAT controls the output as in C printf.  Interpreted sequences are:

       "     double quote

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       e     escape

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NNN   byte with octal value NNN (1 to 3 digits)

       xHH   byte with hexadecimal value HH (1 to 2 digits)

       uHHHH Unicode (ISO/IEC 10646) character with hex value HHHH (4 digits)

       UHHHHHHHH
              Unicode character with hex value HHHHHHHH (8 digits)

       %%     a single %

       %b     ARGUMENT as a string with '' escapes interpreted, except that octal escapes are of the form  or NNN

       %q     ARGUMENT  is  printed  in  a format that can be reused as shell input, escaping non-printable characters with the proposed POSIX $''
              syntax.

       and all C format specifications ending with one of diouxXfeEgGcs, with ARGUMENTs converted to proper type first.  Variable widths are  han-
       dled.

       NOTE:  your  shell  may  have its own version of printf, which usually supersedes the version described here.  Please refer to your shell's
       documentation for details about the options it supports.

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report printf translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       printf(3)

       Full documentation at: <http://www.gnu.org/software/coreutils/printf>
       or available locally via: info '(coreutils) printf invocation'

GNU coreutils 8.28                                                 January 2018                                                          PRINTF(1)
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