Purpose: Print lines matching PATTERN for specified files and revisions.
Usage: bzr grep PATTERN [PATH...]

Options:
--from-root Search for pattern starting from the root of the
branch. (implies --recursive)
-I GLOB, --include=GLOB
Search only files whose base name matches GLOB.
-F, --fixed-string Interpret PATTERN is a single fixed string (not
regex).
-v, --verbose Display more information.
--color=WHEN Show match in color. WHEN is never, always or auto.
-h, --help Show help message.
-q, --quiet Only display errors and warnings.
-n, --line-number show 1-based line number.
-l, --files-with-matches
Print only the name of each input file in which
PATTERN is found.
-i, --ignore-case ignore case distinctions while matching.
--levels=N Number of levels to display - 0 for all, 1 for
collapsed (1 is default).
--usage Show usage message and options.
-X GLOB, --exclude=GLOB
Skip files whose base name matches GLOB.
--no-recursive Don't recurse into subdirectories. (default is
--recursive)
-Z, --null Write an ASCII NUL (\0) separator between output lines
rather than a newline.
-L, --files-without-match
Print only the name of each input file in which
PATTERN is not found.
-r ARG, --revision=ARG
See "help revisionspec" for details.

Description:
This command searches the specified files and revisions for a given
pattern. The pattern is specified as a Python regular expressions[1].

If the file name is not specified, the revisions starting with the
current directory are searched recursively. If the revision number is
not specified, the working copy is searched. To search the last committed
revision, use the '-r -1' or '-r last:1' option.

Unversioned files are not searched unless explicitly specified on the
command line. Unversioned directores are not searched.

When searching a pattern, the output is shown in the 'filepath:string'
format. If a revision is explicitly searched, the output is shown as
'filepath~N:string', where N is the revision number.

--include and --exclude options can be used to search only (or exclude
from search) files with base name matches the specified Unix style GLOB
pattern. The GLOB pattern an use *, ?, and [...] as wildcards, and \
to quote wildcard or backslash character literally. Note that the glob
pattern is not a regular expression.

[1] http://docs.python.org/library/re.html#regular-expression-syntax