linux 如何删除文件中的空格和换行符号并保存到新文件中

sed '/^$/d' tmp.txt >aa.txt
grep -v '^$'  tmp.txt >aa.txt
awk '/./'  tmp.txt >aa.txt
cat tmp.txt | sed 'N;s/\n//g'>aa.txt
cat tmp.txt | sed 'N;s/\n//g'>aa.txt

awk '{printf("%s",$0)}' tmp.txt >aa.txt

while read line;do echo -n "$line"; done <  tmp.txt

sed 's/[[:space:]]//g'  tmp.txt >aa.txt
cat tmp.txt | sed 's/\ //g'>aa.txt

awk '{printf("%s",$0)}' tmp.txt | sed 's/\ //g' $1 >aa.txt

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