Shell脚本判断是文件还是目录怎么写？

Question

Shell脚本判断是文件还是目录怎么写？

Answer 1

#!/bin/bash   if [ -d $1 ] then     echo "$1 is a directory."     exit elif [ -f $1 ] then     echo -n "$1 is a file, "     if [ -L $1 ]     then         echo "and it is also a symbolic link."         A=`ls -L $1`         if [ -e $A ]         then             echo "Symbolic link exist."         else             echo "Symbolic link not exist."         fi         exit     else         echo "but it is not a symbolic link."         exit     fi fi

Answer 2

用printf控制格式输出最简单：
echo "11 22 33"|awk '{printf "%2s\n",$2}'
如果非要用print：
echo "11 22 33"|awk 'BEGIN{FS=" "}{if(NF<2){for(i=NF+1;i<=2;i++) $i=" "};print $0}'
还有sed写法，不过要用正则表达式