Linux lsof 命令

检测端口未被占用

lsof -i:<port>

指定进程号，可以查看该进程打开的文件

lsof -p <pid>

查询所有进程的 open files 数量

psof_file=~/psof.txt
# 每次执行前，清空 psof_file 文件内容
echo "" > $psof_file
# $(ps -eo pid | grep -v PID) 获取所有进程 id
for pid in $(ps -eo pid | grep -v PID)
  # 查询进程的 open files 数量
  do echo $pid":"$(lsof -p $pid|wc -l) >> $psof_file;
  # do echo $pid":"$(lsof -n|grep $pid|wc -l) >> $psof_file;
done
# 对结果进行排序
sort -nrk 2 -t: $psof_file

统计各进程打开句柄数：lsof -n|awk ‘{print $2}’|sort|uniq -c|sort -nr

统计各用户打开句柄数：lsof -n|awk ‘{print $3}’|sort|uniq -c|sort -nr

统计各命令打开句柄数：lsof -n|awk ‘{print $1}’|sort|uniq -c|sort -nr

第一列是打开的句柄数，第二列是进程ID。

查看打开句柄总数
lsof -n|awk ‘{print $2}’|wc -l
查看系统中进程占用的句柄数，根据打开文件句柄的数量降序排列，其中第二列为进程ID：
lsof -n|awk ‘{print $2}’|sort|uniq -c|sort -nr|more
查询系统中指定进程占用的句柄数
lsof -n | grep [PID]| wc -l

[root@grg-zhtest1 ~]# lsof -h
lsof 4.87
 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/
 latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ
 latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man
 usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-f[gG]] [+|-e s]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
[+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]
Defaults in parentheses; comma-separated set (s) items; dash-separated ranges.
  -?|-h list help          -a AND selections (OR)     -b avoid kernel blocks
  -c c  cmd c ^c /c/[bix]  +c w  COMMAND width (9)    +d s  dir s files
  -d s  select by FD set   +D D  dir D tree *SLOW?*   +|-e s  exempt s *RISKY*
  -i select IPv[46] files  -K list tasKs (threads)    -l list UID numbers
  -n no host names         -N select NFS files        -o list file offset
  -O no overhead *RISKY*   -P no port names           -R list paRent PID
  -s list file size        -t terse listing           -T disable TCP/TPI info
  -U select Unix socket    -v list version info       -V verbose search
  +|-w  Warnings (+)       -X skip TCP&UDP* files     -Z Z  context [Z]
  -- end option scan     
  +f|-f  +filesystem or -file names     +|-f[gG] flaGs 
  -F [f] select fields; -F? for help  
  +|-L [l] list (+) suppress (-) link counts < l (0 = all; default = 0)
                                        +m [m] use|create mount supplement
  +|-M   portMap registration (-)       -o o   o 0t offset digits (8)
  -p s   exclude(^)|select PIDs         -S [t] t second stat timeout (15)
  -T qs TCP/TPI Q,St (s) info
  -g [s] exclude(^)|select and print process group IDs
  -i i   select by IPv[46] address: [46][proto][@host|addr][:svc_list|port_list]
  +|-r [t[m<fmt>]] repeat every t seconds (15);  + until no files, - forever.
       An optional suffix to t is m<fmt>; m must separate t from <fmt> and
      <fmt> is an strftime(3) format for the marker line.
  -s p:s  exclude(^)|select protocol (p = TCP|UDP) states by name(s).
  -u s   exclude(^)|select login|UID set s
  -x [fl] cross over +d|+D File systems or symbolic Links
  names  select named files or files on named file systems
Anyone can list all files; /dev warnings disabled; kernel ID check disabled.