awk 往空格

awk 去空格

1. sub(/^[[:blank:]]*/,"",变量)??是去掉变量左边的空白符
   
2. sub(/[[:blank:]]*$/,"",变量) 是去掉变量右边的空白符
   
3. gsub(/[[:blank:]]*/,"",变量) 是去掉变量中所有的空白符
   
4. 
   
5. 示例：
   
6. echo ' 123 456 789??' | awk '{
   
7. print "<" $0 ">";
   
8. sub(/^[[:blank:]]*/,"",$0);print "[" $0 "]";
   
9. sub(/[[:blank:]]*$/,"",$0);print "|" $0 "|";
   
10. gsub(/[[:blank:]]*/,"",$0);print "/" $0 "/";
    
11. }'