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Full Discussion: sed pattern matching question
Top Forums Shell Programming and Scripting sed pattern matching question Post 302518171 by mirni on Thursday 28th of April 2011 07:33:55 PM
Old 04-28-2011
Quote:
From what I can tell the whole string (ABCD|/p) is a literal.
Mmmmm... no.
The string 'ABCD|' is a literal, the rest '/p' is the end of regex ('/') and print command ('p'). So the first sed command
Code:
sed -n -e '/^.*ABCD|/p'

is an instruction to print only lines containing 'ABCD|'. There is some redundancy there; the following would do the same:
Code:
sed -n -e '/ABCD|/p'

The second sed removes the beginning of line until ABCD| including. Note that matching here is greedy, so if you have multiple instances of ABCD| there, the pattern is gonna match the longest possible substring. E.g.:
Code:
$ echo "blah|ABCD|hhhh|fals.;and&+324ABCD|ooo|ABCD" | sed -e 's/^.*ABCD|//' 
ooo|ABCD

The third one removes trailing '|ABCD'

We could simplify this as :
Code:
sed -n '/ABCD|/{  #do the following on lines containing "ABCD|"
            s/^.*ABCD|// ;  #eat the longest substring from beginning to "ABCD|"
            s/|ABCD$//;     # eat the  last "|ABCD" just before end of line
            p }'               # and print it

Last edited by mirni; 04-28-2011 at 08:40 PM..
This User Gave Thanks to mirni For This Post:
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LEARN ABOUT OSX

dsmemberutil

dsmemberutil(1) 					    BSD General Commands Manual 					   dsmemberutil(1)

NAME

     dsmemberutil -- various operations for the membership APIs, including state dump, check memberships, UUIDs, etc.

SYNOPSIS

     dsmemberutil [-v] [-h] command [options]

DESCRIPTION

     dsmemberutil is a program that implements the membership API calls in a command line utility.

FLAGS

     A list of flags and their descriptions:

     -h      Lists the options for calling dsmemberutil

     -v      Causes dsmemberutil to operate in verbose mode.

COMMANDS

     The action of each command is described below:

     getuuid -ugUGsS value
		 Takes any of the options and returns the associated UUID.

     getid -UGsSX value
		 Takes any of the options and returns the associated UID or GID depending on option provided.

     getsid -ugUGX value
		 Takes any of the options and returns the associated SID.

     checkmembership -uUxs param -gGXS param
		 Returns if a user or group with the associated option is a member of the group.

     flushcache  Flushes the current membership cache.

     Legacy commands such as dumpstate and statistics are gone. See odutil(1) for show cache and statistics operations.

     A list of options available. In some cases -xX and -sS can be used synonymously due to nature of the value.

     -u uid	      Using user with UID

     -U name	      Using user with name

     -s sid	      Using user with SID

     -x uuid	      Using user with UUID

     -g gid	      Using group with GID

     -G name	      Using group with name

     -S sid	      Using group with SID

     -X uuid	      Using group with UUID

EXAMPLES

     Get a user's uuid:
		    % dsmemberutil getuuid -u 501
		    EEA4F2F6-B268-49E7-9C6F-E3C4A37DA4FD

     Get a group's uuid
		    % dsmemberutil getuuid -g 0
		    ABCDEFAB-CDEF-ABCD-EFAB-CDEF00000000

     Get a user's or group's id from a uuid
		    % dsmemberutil getid -X ABCDEFAB-CDEF-ABCD-EFAB-CDEF0000000C
		    gid: 12

     Check a user's membership in a group (using UID and GID)
		    % dsmemberutil checkmembership -u 501 -g 0
		    user is not a member of the group

     Check a user's membership in a group (using names)
		    % dsmemberutil checkmembership -U root -G wheel
		    user is a member of the group

SEE ALSO

     odutil(1), dseditgroup(1), dscacheutil(1)

Darwin								    Jan 1, 2007 							    Darwin
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