[Linux_Mantra] Daily Tips

[b.sadhiq]

Open Files - determining how many files are currently open.

             $ cat /proc/sys/fs/file-nr
             2030    263     104851
              |       |        \- maximum open file descriptors 
              |       |         
              |       \- total free allocated file descriptors
              |
              (Total allocated file descriptors since boot)

        Note the maximum number can be set or changed.

              $ cat /proc/sys/fs/file-max
              104851

        To change this

              $ echo "804854" > /proc/sys/fs/file-max
 
        Note lsof | wc -l will report higher numbers because this includes
        open files that are not using file descriptors such as directories,
        memory mapped files, and executable text files.