Shell Programming and Scripting

~$ echo '3 october 2010' | sed [script of some sort]
3 oct 2010

echo 'today is 3 october 2010' | sed -r '/(january|february|march|april|june|july|august|september|october|november|december)/{s/^(...).*/\1/}'

echo '3 october 2010' | awk '{$2=substr($2,1,3)}1'

echo '3 october 2010' |  awk '{print $1,tolower(substr($2,0,3)),$3}'

echo '3 october 2010' | awk 'gsub(/january|february|march|april|june|july|august|september|october|november|december/,[missing part^^]

echo 'today is 3 october 2010' | 
sed -r 's/(jan)uary/\1/g;s/(feb)ruary/\1/g;s/(mar)ch/\1/g;s/(apr)il/\1/g;s/(jun)e/\1/g;s/(jul)y/\1/g;s/(aug)ust/\1/g;s/(sep)tember/\1/g;s/(oct)ober/\1/g;s/(nov)ember/\1/g;s/(dec)ember/\1/g'

perl -lpe 's/(january|february|march|april|june|july|august|september|october|november|december)/substr($1, 0, 3)/eg'

        d=${d//january/jan};d=${d//february/feb};d=${d//march/mar};
        d=${d//april/apr};d=${d//june/jun};d=${d//july/jul};
        d=${d//august/aug};d=${d//september/sep};d=${d//october/oct};
        d=${d//november/nov};d=${d//december/dec}