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Top Forums UNIX for Dummies Questions & Answers Change a character based on its position number Post 302712073 by pamu on Monday 8th of October 2012 01:32:05 PM
Old 10-08-2012
try this...

Code:
awk -F "" '{if((max+NF)>150){for(i=1;i<=NF;i++){if((max+i) == 150 && $i ~ /T/){$i = "C"}}}else{max+=NF}}1' file

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vboxmode(1)						    Linux System Administration 					       vboxmode(1)

NAME
vboxmode - detect format of isdn voice file SYNOPSIS
vboxmode [OPTION] [OPTION] [...] FILENAME DESCRIPTION
Vboxmode detects format of isdn voice files and au files (sun audio format). OPTIONS
-q, --quiet Don't print information about the file, only detect format and return an error code. -h, --help Show summary of options. -v, --version Show version of program. RETURN CODE
The format of the file is returned as an error code: o for .au files a value between 128 and 150 o for vbox files a value between 2 and 6 o for unknown format or errors 255 SEE ALSO
autovbox(1), rmdtovbox(1), vboxtoau(1), vboxcnvt(1), vbox(5) AUTHOR
This manual page was written by Andreas Jellinghaus <aj@dungeon.inka.de>, for Debian GNU/Linux and isdn4linux. ISDN 4 Linux 3.1pre4 2000/09/15 vboxmode(1)
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