在工作过程中，我们进程需要查找某个文件被哪些进程占用。先上脚本：

#!/bin/sh

#example
#Find which process /dev/dri/card0 is occupied by
#./find_file.sh /dev/dri/card0

if [ $# -ne 1 ]
then
echo "Incorrect number of parameters, please add a parameter."
echo "example:Find which process /dev/dri/card0 is occupied by"
echo "./find_file.sh /dev/dri/card0"
exit 1
fi 


for process in /proc/*
do

if [ ! -e ${process}/fd ]
then
continue
fi

str=`ls -l ${process}/fd | grep "$1"`
if [ -n "$str" ]
then
 echo $process >> tt.log
 echo $process
fi

done

脚本原理：

每个进程，在/proc目录下面都对应有一个子目录，每个子目录里面都有一个fd目录，每个fd目录里面记录了本进程都打开了哪些文件。