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5.4 AWK Mode Font Locking

The general appearance of font-locking in AWK mode is much like in any other programming mode. See Faces for Font Lock.

The following faces are, however, used in a non-standard fashion in AWK mode:

font-lock-variable-name-face
This face was intended for variable declarations. Since variables are not declared in AWK, this face is used instead for AWK system variables (such as NF) and “Special File Names” (such as "/dev/stderr").
font-lock-builtin-face (Emacs)/font-lock-preprocessor-face (XEmacs)
This face is normally used for preprocessor directives in CC Mode. There are no such things in AWK, so this face is used instead for standard functions (such as match).
font-lock-string-face
As well as being used for strings, including localizable strings, (delimited by ‘"’ and ‘_"’), this face is also used for AWK regular expressions (delimited by ‘/’).
font-lock-warning-face (Emacs)/c-invalid-face (XEmacs)
This face highlights the following syntactically invalid AWK constructs: