look: add page (#12159)

* look: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/look.md

@@ -0,0 +1,26 @@
+# look
+
+> Display lines beginning with a prefix in a file.
+> NOTE: the lines in the file must be sorted.
+> See also: `grep`, `sort`.
+> More information: <https://manned.org/look>.
+
+- Search for lines beginning with a specific prefix in a specific file:
+
+`look {{prefix}} {{path/to/file}}`
+
+- Case-insensitively search only on blank and alphanumeric characters:
+
+`look -{{f|-ignore-case}} -{{d|-alphanum}} {{prefix}} {{path/to/file}}`
+
+- Specify a string [t]ermination character (space by default):
+
+`look -{t|-terminate} {{,}}`
+
+- Search in `/usr/share/dict/words` (`--ignore-case` and `--alphanum` are assumed):
+
+`look {{prefix}}`
+
+- Search in `/usr/share/dict/web2` (`--ignore-case` and `--alphanum` are assumed):
+
+`look -{{a|-alternative}} {{prefix}}`