magrep — search
    messages matching a pattern
  
    magrep | 
    [-c | -h |
      -o | -p |
      -q | -m
      max] [-v]
      [-i] [-l]
      [-a | -d]
      header:regex
      [msgs ...] | 
  
magrep prints the names of files from the
    specified msgs if the value of
    header matches the POSIX Extended Regular Expression
    regex. (See
    mmsg(7)
    for the message argument syntax.)
If header is empty,
    magrep matches against the maildir flags of
    msgs.
If header is
    ‘*’, magrep
    searches for the pattern in any header.
If header is
    ‘/’, magrep
    searches any plain text parts of the msgs body.
If no msgs are specified and
    magrep is used interactively, the current sequence
    will be searched.
The options are as follows:
  -a 
  - Search for regex in RFC 2822 address
      header parts only.
 
  -c 
  - Only print a count of matching headers. If 
-v is
      specified, count non-matching headers instead. 
  -d 
  - Decode the header according to RFC 2047 prior to
      searching.
 
  -h 
  - Like 
-p but do not print the file name. 
  -i 
  - Match regex case insensitively.
 
  -l 
  - Only search a message until a match has been found.
 
  -m
    max 
  - Do not show more than max matches.
 
  -o 
  - Print each match only, not the entire line. This option is ignored if
      
-c, -q or
      -v is specified. 
  -p 
  - Print the filename, the header and the matching line for each of the
      matched msgs. If 
-o is
      specified each match is printed, instead of the matching line. This option
      is ignored if -c, -q or
      -v is specified. 
  -q 
  - Quiet mode: do not print anything, quit as soon as possible.
 
  -v 
  - Invert the match; print (or count) all files where
      regex does not match.
 
The magrep utility exits 0 on success, 1
    if no match was found and >1 if an error occurs.
magrep is not called mgrep because many
    tools with this name already exist.