# phpman > man > svscan(8)

[svscan(8)](https://www.chedong.com/phpMan.php/man/svscan/8/markdown)                              System Manager's Manual                             [svscan(8)](https://www.chedong.com/phpMan.php/man/svscan/8/markdown)



## NAME
       svscan - starts and monitors a collection of services

## SYNOPSIS
       **svscan** [ _directory_ ]

## DESCRIPTION
       **svscan**  starts one [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown) process for each subdirectory of the current directory, up to
       a limit of 1000 subdirectories.  **svscan** skips subdirectory names starting with dots.   **super**‐‐
       [**vise**(8)](https://www.chedong.com/phpMan.php/man/vise/8/markdown) must be in **svscan**'s path.

       **svscan**  optionally starts a pair of [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown) processes, one for a subdirectory _s_, one for
       _s_/**log**, with a pipe between them. It does this if the name _s_ is at most  255  bytes  long  and
       _s_/**log**  exists.  (In  versions 0.70 and below, it does this if _s_ is sticky.)  **svscan** needs two
       free descriptors for each pipe.

       Every five seconds, **svscan** checks for subdirectories again. If it sees a new subdirectory, it
       starts  a  new  [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown)  process.  If  it  sees an old subdirectory where a [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown)
       process has exited, it restarts the [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown) process. In the **log** case it reuses the  same
       pipe so that no data is lost.

       **svscan** is designed to run forever. If it has trouble creating a pipe or running [**supervise**(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown),
       it prints a message to stderr; it will try again five seconds later.

       If **svscan** is given a command-line argument _directory_, it switches to that _directory_  when  it
       starts.

## SEE ALSO
       [supervise(8)](https://www.chedong.com/phpMan.php/man/supervise/8/markdown),  [svc(8)](https://www.chedong.com/phpMan.php/man/svc/8/markdown),  [svok(8)](https://www.chedong.com/phpMan.php/man/svok/8/markdown),  [svstat(8)](https://www.chedong.com/phpMan.php/man/svstat/8/markdown), [svscanboot(8)](https://www.chedong.com/phpMan.php/man/svscanboot/8/markdown), [readproctitle(8)](https://www.chedong.com/phpMan.php/man/readproctitle/8/markdown), [fghack(8)](https://www.chedong.com/phpMan.php/man/fghack/8/markdown), pgr‐
       [phack(8)](https://www.chedong.com/phpMan.php/man/phack/8/markdown), [multilog(8)](https://www.chedong.com/phpMan.php/man/multilog/8/markdown),  [tai64n(8)](https://www.chedong.com/phpMan.php/man/tai64n/8/markdown),  [tai64nlocal(8)](https://www.chedong.com/phpMan.php/man/tai64nlocal/8/markdown),  [setuidgid(8)](https://www.chedong.com/phpMan.php/man/setuidgid/8/markdown),  [envuidgid(8)](https://www.chedong.com/phpMan.php/man/envuidgid/8/markdown),  [envdir(8)](https://www.chedong.com/phpMan.php/man/envdir/8/markdown),
       [softlimit(8)](https://www.chedong.com/phpMan.php/man/softlimit/8/markdown), [setlock(8)](https://www.chedong.com/phpMan.php/man/setlock/8/markdown)

       <http://cr.yp.to/daemontools.html>



                                                                                           [svscan(8)](https://www.chedong.com/phpMan.php/man/svscan/8/markdown)