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web2c: Editor invocation

 
 4.4 Editor invocation
 =====================
 
 TeX, Metafont, and MetaPost all (by default) stop and ask for user
 intervention at an error.  If the input came from a file, and the user
 responds with 'e' or 'E', the program invokes an editor.
 
    Specifying '--with-editor=CMD' to 'configure' sets the default editor
 command string to CMD.  The environment variables/configuration values
 'TEXEDIT', 'MFEDIT', and 'MPEDIT' (respectively) override this.  If
 '--with-editor' is not specified, the default is 'vi +%d %s' on Unix,
 and an invocation of the TeXworks editor on Windows.  (See 'texmf.cnf'
 for the precise values.)
 
    In this string, '%d' is replaced by the line number of the error, and
 '%s' is replaced by the name of the current input file.
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