shell命令练习 20160425
# echo -e '123 123\naaa bbb' |awk '{print $1,$2}'
123 123
aaa bbb
# echo -e '123 123\naaa bbb' |awk '{printf "%s %s\n",$1,$2}'
123 123
aaa bbb
# echo -e '123 123\naaa bbb' | sed 's/[[:space:]][[:space:]]\+/ /g'
123 123
aaa bbb
# echo -e '123 123\naaa bbb' | sed 's/[^[:alnum:]][^[:alnum:]]\+/ /g'
123 123
aaa bbb
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