How to check all opened files in a directory – lsof command?
LSOF is a smart linux command-line utility for analysing the information about the files which are opened by various processes.
LSOF stands for List of Open Files. This command has a vital role in server Administration. In Linux/Unix everything is considered as a file such as pipes, sockets, devices etc are treated as files.
Thus, by using ‘lsof’ command we will get the information of any opened files. For example, if you are trying to unmound a partition and you are getting the error “files are being used“. Here, you can easily identify the files which are in use by uding the LSOF command.
We already covered the lsof command switches in one of the previous article.
lsof command usages with example – Unix/Linux
lsof command usages is a mandatory thing that every sys admin must know. lsof command lists open files. It’s the short form of “LiSt Open Files.” This command has a vital role in server Administration.
This command reveals the files which are opened by a process. In Linux/Unix, everything is considered as a file such as pipes, sockets, devices etc are treated as files. Thus, by using ‘lsof‘ command we will get the information of any opened files.
Here I’m explaining the usage of LSOF command to list all opened file in a directory.
There is a switch “D” associated with LSOF command to do this. See the usage listed below:
# lsof +D path_of_the_directory
Example
[root@vps ~]# lsof +D /var/log/
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rsyslogd 464 root 1w REG 182,33 139619 131530 /var/log/messages
rsyslogd 464 root 2w REG 182,33 911817 131531 /var/log/secure
rsyslogd 464 root 4w REG 182,33 372734 131529 /var/log/maillog
rsyslogd 464 root 5w REG 182,33 9608 131512 /var/log/cron
httpd 629 root 2w REG 182,33 743 131526 /var/log/httpd/error_log
httpd 629 root 6w REG 182,33 170 131524 /var/log/httpd/access_log
httpd 636 apache 2w REG 182,33 743 131526 /var/log/httpd/error_log
httpd 636 apache 6w REG 182,33 170 131524 /var/log/httpd/access_log
httpd 1382 apache 2w REG 182,33 743 131526 /var/log/httpd/error_log
httpd 1382 apache 6w REG 182,33 170 131524 /var/log/httpd/access_log
lfd 29910 root 5r REG 182,33 139619 131530 /var/log/messages
lfd 29910 root 6r REG 182,33 911817 131531 /var/log/secure
lfd 29910 root 7r REG 182,33 743 131526 /var/log/httpd/error_log
For more information about LSOF, please read this >> 10 lsof command usages with example <<
That’s it!
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