perl - Regular expression to replace a word with another word on the different line unix -

let a,b,c,d,e,f words

input file

a "\t" b  c "\t" d  e "\t" f

etc...

output file:

b "\t" c  d "\t" e  f "\t" etc...

replace word word b 1 same line , replace word b word c next line. wise other lines.

any sed/awk/perl oneliner accomplish that?

one way awk without regex:

awk ' begin { fs=ofs="\t" }  nr==1 { last=$nf; next }       { last=last fs $1; print last; last=$nf} end   { print $nf }' file

Sharma