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Full Discussion: Sed query
Operating Systems OS X (Apple) Sed query Post 302394387 by costaanglais on Thursday 11th of February 2010 09:13:41 AM
Old 02-11-2010
Sed query
Hello Im fairly familiar with using the sed command for substitution, however I have been passed a script which checks the logged on username and directory type with a sed section which I cant figure out. The sed function has me baffled and I cant find out from the man page what its trying to do with the output.

directoryType=`dscacheutil -cachedump -entries user | sed -n "/$username/{g;1!p;};h" | awk '{print $9}'`

Any pointers gratefully recieved.
 

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LEARN ABOUT MOJAVE

dscacheutil

dscacheutil(1)						    BSD General Commands Manual 					    dscacheutil(1)

NAME

     dscacheutil -- gather information, statistics and initiate queries to the Directory Service cache.

SYNOPSIS

     dscacheutil -h
     dscacheutil -q category [-a key value]
     dscacheutil -cachedump [-buckets] [-entries [category]]
     dscacheutil -configuration
     dscacheutil -flushcache
     dscacheutil -statistics

DESCRIPTION

     dscacheutil does various operations against the Directory Service cache including gathering statistics, initiating lookups, inspection, cache
     flush, etc.  This tool replaces most of the functionality of the lookupd tool previously available in the OS.

FLAGS

     A list of flags and their descriptions:

     -h      Lists the options for calling dscacheutil

     -q category
	     Initiate a query using standard calls.  These calls will either return results from the cache or go fetch live data and place them in
	     the cache.  By default if no specific query is requested via -a then all results within that category will be returned.

     -a key value
	     Optional flag to -q for a specific key with a value.

     -cachedump
	     Dumps an overview of the cache by default.  Additional flags will provide more detailed information.

     -buckets
	     Used in conjunction with -cachedump to also print hash bucket usage of the current cache.

     -entries [category]
	     Used in conjunction with -cachedump to dump detailed information about cache entries.  An optional category can be supplied to only
	     see types of interest.  Dumping 'host' entries can only be done by administrative users.

     -configuration
	     Prints current configuration information, such as the search policy from Directory Service and cache parameters.

     -flushcache
	     Flushes the entire cache.	This should only be used in extreme cases.  Validation information is used within the cache along with
	     other techniques to ensure the OS has valid information available to it.

     -statistics
	     Prints statistics from the cache including an overview and detailed call statistics.  Some calls are not cached but are derived from
	     other calls internally.  Cache hits and cache misses may not always be equal to external calls.  For example getaddrinfo is actually
	     a combination of gethostbyname with other calls internally to the cache to maximize cache hit rate.

     Available categories and associated keys:

     group	 name or gid

     host	 name or ip_address (used for both IPv6 and IPv4)

     mount	 name

     protocol	 name or number

     rpc	 name or number

     service	 name or port

     user	 name or uid

EXAMPLES

     Lookup a user:
		    % dscacheutil -q user -a name jdoe
		    name: jdoe
		    password: ********
		    uid: 501
		    gid: 501
		    dir: /Users/jdoe
		    shell: /bin/csh
		    gecos: John Doe

     Lookup all users:
		    % dscacheutil -q user

     Dump cache overview:
		    % dscacheutil -cachedump

     Dump cache details with user entries:
		    % dscacheutil -cachedump -entries user

SEE ALSO

     DirectoryService(8), dsmemberutil(1)

Darwin								   Jan 14, 2007 							    Darwin
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