Code:
cat teledir.txt
jai sharma 25853670
chanchal singhvi 9831545629
anil aggarwal 9830263298
shyam saksena 23217847
lalit chowdury 26688726Code:
sed 's/\([a-z]*\) *\([a-z]*\)/\2, \1/' teledir.txt | sort
aggarwal, anil 9830263298
chowdury, lalit 26688726
saksena, shyam 23217847
sharma, jai 25853670
singhvi, chanchal 9831545629