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Test Your Knowledge in Computers #511
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Many programming languages do not allow you to begin a variable name with a number as it would make it more difficult for a compiler or interpreter to parse a program's source code.
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perfused(8) [netbsd man page]

PERFUSED(8)						    BSD System Manager's Manual 					       PERFUSED(8)

perfused -- PUFFS Enabled Relay to FUSE Daemon SYNOPSIS
perfused [-fs] [-d types] [-i -fd] DESCRIPTION
perfused is a userland daemon implementing the FUSE kernel level API. It creates a /dev/fuse socket for FUSE file system daemons to connect to. perfused takes care of mounting the file system using puffs(3). When the kernel sends a puffs(3) operation for the mounted file system, perfused will translate it into a FUSE request, and will send it to the file system daemon through /dev/fuse. The FUSE reply will be converted back into a puffs(3) reply and will be relayed to the kernel. FUSE file system daemons must be modified so that they request perfused to perform the mount(2) system call instead of doing it on their own. This is done by replacing mount(2) and the open(2) calls for /dev/fuse with perfuse_mount() and perfuse_open(), respectively, in their sources. libperfuse(3) must be used at link time. Most FUSE file system daemons use libfuse and will work unmodified, provided the modifi- cation is done in libfuse itself . The following options are available: -d types Print additional debug information. types is a comma-separated list of information types to print: puffs Display PUFFS requests and replies. fuse Display FUSE requests and replies. dump Dump content of FUSE frames. fh Display file handle activity. reclaim Display reclaim activity. readdir Display readdir activity. requeue Display requeue activity. sync Display dirty flags and sync operations. -f Do not fork, but stay in the foreground. -i fd Do not open /dev/fuse but use the socket available from the file descriptor fd. This is used when perfused is started from libperfuse(3). -s Enable debug output only when receiving SIGINFO. SIGNALS
SIGINFO If the -s flag was used, toggle debug output. Do nothing otherwise. SIGUSR1 Toggle FUSE operation dump on and off. When toggling off, the trace is is stored in /var/run/perfuse-xxx.trace (xxx is the filesys- tem mount point). ERRORS
The program logs to the syslog daemon as facility ``daemon''. For detailed debugging use the -d (debug) option. SEE ALSO
mount(2), perfuse_mount(3), puffs(4) AUTHORS
The program was written by Emmanuel Dreyfus <>. BUGS
When perfused runs in the foreground (using the -f flag), some processes using the FUSE file system will sometime hang on 'uvn_fp2'. BSD
January 29, 2012 BSD

Check Out this Related Man Page

CONVMVFS(1)						      General Commands Manual						       CONVMVFS(1)

convmvfs - utility that mirrors a whole filesystem tree from one charset to another. SYNOPSIS
convmvfs mountpoint [ options ] DESCRIPTION
This manual page documents briefly the convmvfs command. convmvfs is a FUSE (File System in Userspace) utility that transparently mirrors a filesystem tree converting the filenames from one charset to another on the fly. Only the names of files and directories are converted, the file content remains intact. The mirrored tree is mounted at the given mountpoint. OPTIONS
General options -o opt[,opt...] mount options -h, --help print help -V, --version print version -h, --help show summary of options FUSE options -d, -o debug enable debug output (implies -f) -f foreground operation -s disable multi-threaded operation -o Mount options are specified with a -o flag followed by a comma separated list of options. The following options are recognized: allow_other allow access to other users allow_root allow access to root nonempty allow mounts over non-empty file/dir default_permissions enable permission checking by kernel fsname=NAME set filesystem name large_read issue large read requests (2.4 only) max_read=N set maximum size of read requests hard_remove immediate removal (don't hide files) use_ino let filesystem set inode numbers readdir_ino try to fill in d_ino in readdir direct_io use direct I/O kernel_cache cache files in kernel umask=M set file permissions (octal) uid=N set file owner gid=N set file group entry_timeout=T cache timeout for names (1.0s) negative_timeout=T cache timeout for deleted names (0.0s) attr_timeout=T cache timeout for attributes (1.0s) srcdir=PATH which directory to convert icharset=CHARSET charset used in srcdir ocharset=CHARSET charset used in mounted filesystem NOTES
If you use a normal user account to mount the file system be sure to have r/w permissions to /dev/fuse. Use iconv --list to see which charsets are supported. To allow other users to access the mount point use allow_other option. IMPORTANT: if the mount point and srcdir point at the same directory, readdir call will enter a dead loop. BE SURE TO AVOID THIS SITUA- TION! SAMPLE USE
to mount: $ convmvfs /ftp/pub_gbk -o srcdir=/ftp/pub,icharset=utf8,ocharset=gbk to unmount: $ fusermount -u /ftp/pub_gbk SEE ALSO
fusermount(1), mount(8) AUTHOR
convmvfs was written by Z.C. Miao <>. This manual page was written by Stanislav Maslovski <>, for the Debian project (but may be used by others). October 3, 2007 CONVMVFS(1)

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