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Full Discussion: Search for a string and replace the searched string in the same position in samefile
Top Forums UNIX for Dummies Questions & Answers Search for a string and replace the searched string in the same position in samefile Post 302297405 by ganesh_248 on Friday 13th of March 2009 09:48:13 AM
Old 03-13-2009
awk '{sub(/^../,"20",$6); print}' infile > tmpfile
This will replace the first two digits in "coulmn 6" as "20"
White if i want to replace the first two digits with the same "20" in other columns also,in the same command,how do i do it. I tried

head -8 $file1 | awk '{sub(/^01/,"20",$1); print}' | awk '{sub(/^01/,"20",$2); print}' | awk '{sub(/^01/,"20",$3); print}' > file2.txt

but only the first two columns are getting modified while the 3rd column does not.why is the third pipeline not working??
is there any command to make the above 3 changes( i mean can we modify 2 or more columns by replacing the first two characters alone) in the same command itself without increasing the temporary files being created to hold the modified values (like file1.txt,file2.txt...)
Pls help
 

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LEARN ABOUT DEBIAN

gdcmdiff

gdcmdiff(1)							       GDCM							       gdcmdiff(1)

NAME

       gdcmdiff - .SH "SYNOPSIS"

       gdcmdiff [options] file1 file2

DESCRIPTION

       The gdcmdiff command line program takes as input two DICOM file: file1 and file2.

PARAMETERS

       file1   DICOM input filename

       file2  DICOM output filename

options
   options
	 -m	 --meta 	 Compare metainformation. Default is off.
	 -t <n>  --truncate <n>  String values trimmed to n characters.

   general options
	 -h   --help
		print this help text and exit

	 -v   --version
		print version information and exit

	 -V   --verbose
		verbose mode (warning+error).

	 -W   --warning
		warning mode, print warning information

	 -E   --error
		error mode, print error information

	 -D   --debug
		debug mode, print debug information

Simple usage
       gdcmdiff is a great tool to diff DICOM files. Usage is simply:

       $ gdcmdiff input1.dcm input2.dcm

SEE ALSO

       gdcmdump(1), gdcminfo(1)

COPYRIGHT

       Copyright (c) 2006-2011 Mathieu Malaterre

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