看到过的最好的一个讲解sed & awk的PPT
http://www.cs.nyu.edu/~mohri/unix08/lect5.pdf
现在制作一个自己的版本的ls
sed_ls_fmt
s/^d/dir /1
s/^-/file /1
s/\([rwxs-]\{3\}\)\([rwxs-]\{3\}\)\([rwxs-]\{3\}\)/\1 \2 \3/
awk_ls_fmt
NR != 1{size = 0
unit = "B" if ($8 < 1024)size = $8
else if($8 < 1024 * 1024)
{size = $8/1024
unit = "KB"}
else if($8 < 1024 * 1024 * 1024)
{size = $8/1024/1024
unit = "MB"}
else {size = $8/1024/1024/1024
unit = "GB"}
printf("%6s\tlink:%s\towner:%6s[%s]\tgroup:%6s[%s]\tothers:[%s]\t%6.2f %s\tmtime:[%2s %2s %5s] %s\n", $1,
$5,
$6,
$2,
$7,
$3,
$4,
size,
unit,
$9,
$10,
$11,
$12);
}
ls.sh
ls -l $1 | sed -f sed_ls_fmt | awk -f awk_ls_fmt
效果如下：
bash ls.sh ~
file link:1 owner:daniel[rw-] group:daniel[r--] others:[r--] 32.62 MB mtime:[3月 28 17:33] pin-2.13-62732-gcc.4.4.7-linux.tar.gz
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[2月 12 20:01] 公共的
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[2月 12 20:01] 模板
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[2月 12 20:01] 视频
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[3月 7 15:00] 图片
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[2月 12 20:01] 文档
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[5月 22 17:50] 下载
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[2月 12 20:01] 音乐
dir link:2 owner:daniel[rwx] group:daniel[r-x] others:[r-x] 4.00 KB mtime:[3月 8 16:26] 桌面
原文地址：http://www.cnblogs.com/long123king/p/3747251.html
