regex - Unable to create sed substitution to deduplicate file -

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i have file many duplicates of form

a b b c c

which need reduce to

a b c

so wrote sed command: sed -r 's/^(.*)$\n^(.*)$/\1/mg' filename, file still showing duplicates. i'm sure regex works because tested here.

so doing wrong?

i suspect may related -r option, i'm not sure (but without invalid reference \1 ons' command's rhs` error).

either of 2 simpler approaches should work you.

a simple awk command print line first time maintaining array of printed lines:

awk '!seen[$0]++' file b c

since file sorted can use uniq also:

uniq file b c

edit: newer gnu-awk versions support in place editing using:

awk -i 'inplace' '!seen[$0]++' file

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