Replace second match+awk/sed Post: 302876449

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Hi Friends, I have looked around the forums and over online but couldn't figure out how to deal with this problem input.txt gene1,axis1/0/1,axis2/0/1 gene1,axis1/1/2,axis2/1/2 gene1,axis1/2/3,axis2/2/3 gene2,axis1/3/4,axis2/3/4 Match on first column and if first column is...

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tac

TAC(1)								   User Commands							    TAC(1)

NAME

       tac - concatenate and print files in reverse

SYNOPSIS

       tac [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, last line first.  With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --before
	      attach the separator before instead of after

       -r, --regex
	      interpret the separator as a regular expression

       -s, --separator=STRING
	      use STRING as the separator instead of newline

       --help display this help and exit

       --version
	      output version information and exit

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

AUTHOR

       Written by Jay Lepreau and David MacKenzie.

COPYRIGHT

       Copyright (C) 2013 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

       rev(1)

       The  full  documentation  for tac is maintained as a Texinfo manual.  If the info and tac programs are properly installed at your site, the
       command

	      info coreutils 'tac invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								    TAC(1)

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