linux - insert symbol between numbers -

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i have file in linux os containing random numbers:

1 22 333 4444 55555 666666 7777777 88888888

now, have 2 conditions: 1. remove last 3 digit every entry , put / in between rest. 2. numbers <=3, add/replace / symbol.

command trying fulfilling 1st requirement is:

 sed -e 's|\(.\)|\1/|g;s|\(.*\)/\(.\/\)\{3\}|\1|g'

desired out required:

/ / / 4 5/5 6/6/6 7/7/7/7 8/8/8/8/8

please help.

something might work you:

% sed 's/.\{1,3\}$//;s/./\/&/g;s/.//;s/^$/\//' file / / / 4 5/5 6/6/6 7/7/7/7 8/8/8/8/8

no smart moves here:

s/.\{1,3\}$//; # remove last 3 character s/./\/&/g;     # insert / before each character s/.//;         # remove first character (it's /) s/^$/\//       # insert slash on empty lines

alternative solution gawk:

awk -v fs='' -v ofs='/' '{if (nf > 3) nf=(nf-3); else $0 = ofs}1' file

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