PICK(1) 							     [nmh-1.5]								   PICK(1)

NAME

       pick - search for messages by content

SYNOPSIS

       pick [+folder] [msgs] [-and ...]  [-or ...]  [-not ...]	[-lbrace ...  -rbrace] [--component pattern] [-cc pattern] [-date pattern] [-from
	    pattern] [-search pattern] [-subject pattern] [-to pattern] [-after date] [-before date] [-datefield field] [-sequence name ...]
	    [-public | -nopublic] [-zero | -nozero] [-list | -nolist] [-version] [-help]

       typical usage:

	    scan `pick -from jones`
	    pick -to holloway -sequence select
	    show `pick -before friday`

DESCRIPTION

       Pick searches within a folder for messages with the specified contents, and then identifies those messages.  Two types of search primitives
       are available: pattern matching and date constraint operations.

       A modified grep(1) is used to perform the matching, so the full regular expression (see ed(1)) facility is available within pattern.   With
       -search, pattern is used directly, and with the others, the grep pattern constructed is:

	    `component[ 	]*:.*pattern'

       This  means  that the pattern specified for a -search will be found everywhere in the message, including the header and the body, while the
       other pattern matching requests are limited to the single specified component.  The expression

	    `--component pattern'

       is a shorthand for specifying

	    `-search "component[ 	]*:.*pattern" '

       It is used to pick a component which is not one of "To:", "cc:", "Date:", "From:", or "Subject:".  An example is "pick --reply-to pooh".

       Pattern matching is performed on a per-line basis.  Within the header of the message, each component is treated as one long  line,  but	in
       the  body,  each  line  is  separate.  Lower-case letters in the search pattern will match either lower or upper case in the message, while
       upper case will match only upper case.

       Note that since the -date switch is a pattern matching operation (as described above), to find messages sent on a certain date the  pattern
       string must match the text of the "Date:" field of the message.

       Independent  of any pattern matching operations requested, the switches -after date or -before date may also be used to introduce date/time
       constraints on all of the messages.  By default, the "Date:" field is consulted, but if another date yielding field (such  as  "BB-Posted:"
       or "Delivery-Date:") should be used, the -datefield field switch may be used.

       With  -before  and  -after,  pick  will	actually parse the date fields in each of the messages specified in `msgs' and compare them to the
       date/time specified.  If -after is given, then only those messages whose "Date:" field value is chronologically after  the  date  specified
       will be considered.  The -before switch specifies the complimentary action.

       Both  the  -after  and -before switches take legal 822-style date specifications as arguments.  Pick will default certain missing fields so
       that the entire date need not be specified.  These fields are (in order of defaulting): timezone, time and timezone, date, date	and  time-
       zone.  All defaults are taken from the current date, time, and timezone.

       In addition to 822-style dates, pick will also recognize any of the days of the week ("sunday", "monday", and so on), and the special dates
       "today", "yesterday" (24 hours ago), and "tomorrow" (24 hours from now).  All days of the week are judged to refer to a	day  in  the  past
       (e.g., telling pick "saturday" on a "tuesday" means "last saturday" not "this saturday").

       Finally, in addition to these special specifications, pick will also honor a specification of the form "-dd", which means "dd days ago".

       Pick  supports  complex	boolean  operations  on the searching primitives with the -and, -or, -not, and -lbrace ...  -rbrace switches.  For
       example,

	    pick -after yesterday -and
		 -lbrace -from freida -or -from fear -rbrace

       identifies messages recently sent by "frieda" or "fear".

       The matching primitives take precedence over the -not switch, which in turn takes precedence over -and which in turn takes precedence  over
       -or.   To override the default precedence, the -lbrace and -rbrace switches are provided, which act just like opening and closing parenthe-
       ses in logical expressions.

       If no search criteria are given, all the messages specified on the command line are selected (this defaults to "all").

       Once the search has been performed, if the -list switch is given, the message numbers of the selected messages are written to the  standard
       output  separated by newlines.  This is extremely useful for quickly generating arguments for other nmh programs by using the "backquoting"
       syntax of the shell.  For example, the command

	    scan `pick +todo -after "31 Mar 83 0123 PST"`

       says to scan those messages in the indicated folder which meet the appropriate criterion.  Note that since pick's context changes are writ-
       ten out prior to scan's invocation, you need not give the folder argument to scan as well.

       The  -sequence  name  switch may be given once for each sequence the user wishes to define.  For each sequence named, that sequence will be
       defined to mean exactly those messages selected by pick.  For example,

	    pick -from frated -seq fred

       defines a new message sequence for the current folder called "fred" which contains exactly those messages that were selected.

       By default, pick will zero the sequence before adding it.  This action can be disabled with the -nozero switch, which means that  the  mes-
       sages  selected	by  pick will be added to the sequence, if it already exists, and any messages already a part of that sequence will remain
       so.

       The -public and -nopublic switches are used by pick in the same way mark uses them.

FILES

       $HOME/.mh_profile	  The user profile

PROFILE COMPONENTS

       Path:		    To determine the user's nmh directory
       Current-Folder:	    To find the default current folder

SEE ALSO

       mark(1)

DEFAULTS

       `+folder' defaults to the current folder
       `msgs' defaults to all
       `-datefield date'
       `-zero'
       `-list' is the default if no `-sequence', `-nolist' otherwise

CONTEXT

       If a folder is given, it will become the current folder.

HISTORY

       In previous versions of MH, the pick command would show, scan, or refile the selected messages.	This was rather "inverted logic" from  the
       UNIX  point of view, so pick was changed to define sequences and output those sequences.  Hence, pick can be used to generate the arguments
       for all other MH commands, instead of giving pick endless switches for invoking those commands itself.

       Also, previous versions of pick balked if you didn't specify a search string or a date/time constraint.	The current version does not,  and
       merely matches the messages you specify.  This lets you type something like:

	    show `pick last:20 -seq fear`

       instead of typing

	    mark -add -nozero -seq fear last:20
	    show fear

       Finally, timezones used to be ignored when comparing dates: they aren't any more.

HELPFUL HINTS

       Use "pick sequence -list" to enumerate the messages in a sequence (such as for use by a shell script).

BUGS

       The  argument to the -after and -before switches must be interpreted as a single token by the shell that invokes pick.  Therefore, one must
       usually place the argument to this switch inside quotes.  Furthermore, any occurrence of -datefield must  occur	prior  to  the	-after	or
       -before switch it applies to.

       If pick is used in a back-quoted operation, such as

	    scan `pick -from jones`

       and  pick selects no messages (e.g., no messages are from "jones"), then the shell will still run the outer command (e.g., scan).  Since no
       messages were matched, pick produced no output, and the argument given to the outer command as a result of backquoting pick is  empty.	In
       the  case  of  nmh programs, the outer command now acts as if the default `msg' or `msgs' should be used (e.g., "all" in the case of scan).
       To prevent this unexpected behavior, if -list was given, and if its standard output is not a tty, then pick  outputs  the  illegal  message
       number "0" when it fails.  This lets the outer command fail gracefully as well.

       The pattern syntax "[l-r]" is not supported; each letter to be matched must be included within the square brackets.

MH.6.8								   11 June 2012 							   PICK(1)