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authorThomas Voss <mail@thomasvoss.com> 2024-01-12 02:19:07 +0100
committerThomas Voss <mail@thomasvoss.com> 2024-01-12 02:19:07 +0100
commit65a00a04ff2c4ed954aec2efa1cd52713fe641b9 (patch)
treeafbadefd35aa569472e7f0fd246188c46fe9ef20
parentb756c2b7aec0d4ed6b3d4458c3ef834c67d64607 (diff)
Update the grab(1) manual
-rw-r--r--grab.151
1 files changed, 50 insertions, 1 deletions
diff --git a/grab.1 b/grab.1
index fba3c4e..f58ff7f 100644
--- a/grab.1
+++ b/grab.1
@@ -6,7 +6,7 @@
.Nd search for patterns in files
.Sh SYNOPSIS
.Nm
-.Op Fl z
+.Op Fl fnz
.Ar pattern
.Op Ar
.Nm
@@ -36,15 +36,43 @@ The special filename
can also be provided,
which represents the standard input.
.Pp
+The default behavior of
+.Nm
+is to print pattern matches to the standard-output.
+If more than one file argument is provided,
+matches will be prefixed by their respective filename and a colon.
+Note that this behavior is modified by the
+.Fl f
+and
+.Fl z
+options.
+.Pp
The options are as follows:
.Bl -tag -width Ds
+.It Fl f , Fl Fl filenames
+Always prefix matches with the names of the files in which the matches
+were made,
+even if only 1 file was provided.
.It Fl h , Fl Fl help
Display help information by opening this manual page.
+.It Fl n , Fl Fl newline
+Don’t match newline characters
+.Pq Sq \en
+with the dot
+.Pq Sq \&.
+operator in patterns,
+or in negated character-classes.
.It Fl z , Fl Fl zero
Separate output data by null bytes
.Pq Sq \e0
instead of newlines.
This option can be used to process matches containing newlines.
+.Pp
+If combined with the
+.Fl f
+option,
+or if two or more files were provided as arguments,
+filenames and matches will be separated by null bytes instead of colons.
.El
.Ss Pattern Syntax
A pattern is a sequences of commands optionally separated by whitespace.
@@ -79,6 +107,25 @@ filters out the specific number 1337.
As you may use whichever delimiter you like, the following is also valid:
.Pp
.Dl x|[0-9]+| g.3. v#^1337#
+.Sh ENVIRONMENT
+.Bl -tag -width GRAB_COLOR_FNAME
+.It Ev GRAB_COLOR_FNAME
+The color(s) with which to highlight filenames,
+or 35 if unset.
+.It Ev GRAB_COLOR_SEPC
+The color(s) with which to highlight the colon-separator between
+filenames and matches,
+or 36 if unset.
+.It Ev NO_COLOR
+Do not display any colored output when set to a non-empty string,
+even if the standard-output is a terminal.
+.El
+.Pp
+The
+.Ev GRAB_COLOR_*
+environment variables are SGR parameters.
+For more information regarding SGR parameters see
+.Sx SEE ALSO .
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
@@ -93,5 +140,7 @@ List all your systems CPU flags, sorted and without duplicates:
.%T Structural Regular Expressions
.%U https://doc.cat-v.org/bell_labs/structural_regexps/se.pdf
.Re
+.Pp
+.Lk https://en.wikipedia.org/wiki/ANSI_escape_code#SGR "SGR Parameters"
.Sh AUTHORS
.An Thomas Voss Aq Mt mail@thomasvoss.com