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Top Forums UNIX for Dummies Questions & Answers Tests for existence of files/directories Post 302254892 by msb65 on Wednesday 5th of November 2008 11:43:39 AM
Old 11-05-2008
Tests for existence of files/directories

Hi,

- The first question I have concerns a very fundamental aspect of a unix OS. Specifically, does unix treat everything as a file (ie a directory is just a type of file)?

- The reason I ask is that I am trying to determine which BASH unary operator I would to use to determine whether or not a directory exists. I am writing a BASH shell script where the user defines a directory in which data files will be placed. I would then like to check that the specified directory exists, and if not the script will error.

I am inclined to use the -d operator (file is a directory). Does this have an implicit test for existence?

The other choice I can think of is the -e operator (file exists). This would assume that unix treats directories as files.

I appreciate any help. Thank you.

Mike
 

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uuaids(8c)																uuaids(8c)

Name
       uucompact, uumkspool, uurespool, uupoll - uucp utilities

Syntax
       uucompact -ssystem
       uumkspool system ...
       uurespool [ -t# ]
       uupoll system ...

Description
       All of the commands are located in

       The  command  compacts  uucp  system spool directories and associated subdirectories. If system is ALL, then all existing uucp system spool
       directories are compacted.  Otherwise, only the specified system spool directory is compacted.  If no system is	specified,  is	compacted.
       If  is stopped before it is finished, it can be restarted without reprocessing directories.  The command continues processing where it left
       off during it's previous instantiation.

       The command makes a per system spool directory and associated subdirectories for each of the specified systems.	For example, if system	is
       mk3 and if the local system name is penny, the following directories are created:
	       /usr/spool/uucp/sys/mk3
	       /usr/spool/uucp/sys/mk3/C.
	       /usr/spool/uucp/sys/mk3/X.
	       /usr/spool/uucp/sys/mk3/D.
	       /usr/spool/uucp/sys/mk3/D.penny
	       /usr/spool/uucp/sys/mk3/D.penny
       The  command  moves files from old spool directories to	new spool directories.	Because the structure of the spool directories has changed
       from older versions of it is necessary to respool old spooled files to new spool directories in at least two instances:

       o    When installing the current version of

       o    When creating a new system spool directory for each system.

       In the latter case, it is necessary to move files from to the new spool directories.  To ease this task, moves files that have been spooled
       in  one	of 4 formats and respools them under the new spooling structure.  The format is specified by the -t# option, where the number sign
       (#) can be any one of the following:

       o   Original spool - All files are in

       o   Split spool - Contains the subdirectories

       o   Modified split spool -  Contains all subdirectories listed in split spool, and

       o   Used when a new system directory has been created and spool files must be moved from the DEFAULT directory to the new system directory.

       The command forces a connect attempt to the named systems even if recent attempts have failed, but not if the file prohibits the call.  For
       example, the file will prohibit the call if it is the wrong time of day.  Thus, the should be monitored for messages about the connection.

Files
       Spool directory

       Logfile

See Also
       mail(1), uucp(1c), uux(1c)

																	uuaids(8c)
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