Using AWK or Sed how can I remove trailing carriage return and a line feeds before first txt

Question

Using AWK or Sed, how can I remove carriage returns and line feeds from the start of a file before first txt.

Before

 TOP OF FILE - Carriage returns and line feeds before txt


 <?xml version="1.0" encoding="UTF-8"?>
 <fredBaa version="1.2" properties="2.8" Baa="2.13 r1665067">
  <hashTree>...

After

TOP OF FILE - No Carriage returns and line feeds before txt
 <?xml version="1.0" encoding="UTF-8"?>
 <fredBaa version="1.2" properties="2.8" Baa="2.13 r1665067">
  <hashTree>...

Answer 1

you can try this:

awk '/</{a=1}a' file

or to remove all leading lines until the one that has a non-blank character:

awk '/[^[:space:]]/{a=1}a' file

Answer 2

所有你需要的是：

awk 'NF{f=1}f' file

Answer 3

这对你有用吗？

sed '0,/./{/./!d}' file