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The easiest solution in my opinion is to add dummy file at the end:
egrepline="filename1"
egrepline="$egrepline /dev/null"
egrep -n "is" $egrepline

awk '/pattern/{print FILENAME,FNR,$0}' *

$ echo abc 123 the brown dog | sed 's/ /~/1;s/ /~/1' | awk -F"~" '{print $2,":",$1,":",$3'}
123 : abc : the brown dog

You can do two substitutions in one sed command; needed that first.

You printed 3 columns, ergo you get 3 columns.

You can also just put : inside the fields themselves though, and alter individual columns, then print the entire line.

awk '{T=$1; $1=$2" :"; $2=T...