find "somedir" -type l -print0|xargs -r0 file|grep "broken symbolic"|sed -e 's/^|: *broken symbolic.*$/"/g'

在此处 ”xargs -r0 file“ 做何解释？
“'s/^|: *broken symbolic.*$/" ”----如何理解？？

xargs 参数-0 说明传入字符串以null字符结尾, 空格, 引号 反斜扛不做特殊处理.  并传给file命令

后面那个sed是替换

sed -e 's/^|: *broken symbolic.*$/"/g' 
^从记录开头匹配  字符|: ( *)空格 *标识0个或者多个 字符broken symbolic
.*：.标识1个字符  .*标识所有字符  $记录尾  .*$标识匹配到记录尾所有字符  替换成"

这条应该不行吧，^标识从字符串开头匹配，而你现在这句要替换的并不在开头

#cat csdn_test
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf:broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf: broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf:    broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
:broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
:    broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'

执行：
开头匹配，只替换后面的两条记录
#sed -e 's/^: *broken symbolic.*$/"/g' csdn_test
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf:broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf: broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf:    broken symbolic link to `/usr/share/omf-langpack/gnome-bluetooth/gnome-bluetooth-ru.omf'
"
"

非开头匹配，替换所有记录
#sed -e 's/: *broken symbolic.*$/"/g' csdn_test
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf"
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf"
/usr/share/omf/gnome-bluetooth/gnome-bluetooth-ru.omf"
"
"