The ack manual says:
−−ignore−file=FILTERTYPE:FILTERARGS
Ignore files matching FILTERTYPE:FILTERARGS. The filters are
specified identically to file type filters as seen in "Defining
your own types".
Defining your own types
ack allows you to define your own types in addition to the predefined
types. This is done with command line options that are best put into an
.ackrc file − then you do not have to define your types over and over
again. In the following examples the options will always be shown on
one command line so that they can be easily copy & pasted.
ack −−perl foo searches for foo in all perl files. ack −−help=types
tells you, that perl files are files ending in .pl, .pm, .pod or .t. So
what if you would like to include .xs files as well when searching for
−−perl files? ack −−type−add perl:ext:xs −−perl foo does this for you.
−−type−add appends additional extensions to an existing type.
If you want to define a new type, or completely redefine an existing
type, then use −−type−set. ack −−type−set eiffel:ext:e,eiffel defines
the type eiffel to include files with the extensions .e or .eiffel. So
to search for all eiffel files containing the word Bertrand use ack
−−type−set eiffel:ext:e,eiffel −−eiffel Bertrand. As usual, you can
also write −−type=eiffel instead of −−eiffel. Negation also works, so
−−noeiffel excludes all eiffel files from a search. Redefining also
works: ack −−type−set cc:ext:c,h and .xs files no longer belong to the
type cc.
When defining your own types in the .ackrc file you have to use the
following:
−−type−set=eiffel:ext:e,eiffel
or writing on separate lines
−−type−set
eiffel:ext:e,eiffel
The following does NOT work in the .ackrc file:
−−type−set eiffel:ext:e,eiffel
In order to see all currently defined types, use −−help−types, e.g.
ack −−type−set backup:ext:bak −−type−add perl:ext:perl −−help−types
In addition to filtering based on extension (like ack 1.x allowed), ack
2 offers additional filter types. The generic syntax is −−type−set
TYPE:FILTER:FILTERARGS; FILTERARGS depends on the value of FILTER.
is:FILENAME
is filters match the target filename exactly. It takes exactly one
argument, which is the name of the file to match.
Example:
−−type−set make:is:Makefile
ext:EXTENSION[,EXTENSION2[,...]]
ext filters match the extension of the target file against a list
of extensions. No leading dot is needed for the extensions.
Example:
−−type−set perl:ext:pl,pm,t
match:PATTERN
match filters match the target filename against a regular
expression. The regular expression is made case insensitive for
the search.
Example:
−−type−set make:match:/(gnu)?makefile/
firstlinematch:PATTERN
firstlinematch matches the first line of the target file against a
regular expression. Like match, the regular expression is made
case insensitive.
Example:
−−type−add perl:firstlinematch:/perl/
More filter types may be made available in the future.
Thanks,