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Concept index
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* Menu:

* Arguments to macros:                  Macro Arguments
* Arguments to macros:                  Arguments
* Arguments to macros, special:         Pseudo Arguments
* Arguments, quoted macro:              Quoting Arguments
* Arithmetic:                           Arithmetic
* Builtins, indirect call of:           Builtin
* Call of built-ins, indirect:          Builtin
* Call of macros, indirect:             Indir
* Changing comment delimiters:          Changecom
* Changing the quote delimiters:        Changequote
* Characters, translating:              Translit
* Command line, filenames on the:       Invoking m4
* Command line, macro definitions on the: Invoking m4
* Command line, options:                Invoking m4
* Commands, exit code from Unix:        Sysval
* Commands, running Unix:               Unix commands
* Comment delimiters, changing:         Changecom
* Comments:                             Comments
* Comments, copied to output:           Changecom
* Comparing strings:                    Ifelse
* Compatibility:                        Compatibility
* Conditionals:                         Ifdef
* Controlling debugging output:         Debug Levels
* Counting loops:                       Loops
* Debugging output, controlling:        Debug Levels
* Debugging output, saving:             Debug Output
* Decrement operator:                   Incr
* Defining new macros:                  Definitions
* Definitions, displaying macro:        Dumpdef
* Deleting macros:                      Undefine
* Deleting whitespace in input:         Dnl
* Discarding diverted text:             Cleardiv
* Displaying macro definitions:         Dumpdef
* Diversion numbers:                    Divnum
* Diverted text, discarding:            Cleardiv
* Diverting output to files:            Divert
* Error messages, printing:             Errprint
* Evaluation, of integer expressions:   Eval
* Executing Unix commands:              Unix commands
* Exit code from Unix commands:         Sysval
* Exiting from m4:                      M4exit
* Expansion of macros:                  Macro expansion
* Expansion, tracing macro:             Trace
* Expressions, evaluation of integer:   Eval
* Extracting substrings:                Substr
* File inclusion:                       File Inclusion
* File inclusion:                       Undivert
* Filenames, on the command line:       Invoking m4
* Files, diverting output to:           Divert
* Files, names of temporary:            Maketemp
* Forloops:                             Loops
* Formatted output:                     Format
* GNU extensions:                       Arguments
* GNU extensions:                       Search Path
* GNU extensions:                       Format
* GNU extensions:                       Builtin
* GNU extensions:                       Regexp
* GNU extensions:                       Esyscmd
* GNU extensions:                       Undivert
* GNU extensions:                       Debug Output
* GNU extensions:                       Extensions
* GNU extensions:                       Indir
* GNU extensions:                       Patsubst
* GNU extensions:                       Debug Levels
* Included files, search path for:      Search Path
* Inclusion, of files:                  File Inclusion
* Inclusion, of files:                  Undivert
* Increment operator:                   Incr
* Indirect call of built-ins:           Builtin
* Indirect call of macros:              Indir
* Input tokens:                         Syntax
* Input, saving:                        M4wrap
* Integer arithmetic:                   Arithmetic
* Integer expression evaluation:        Eval
* Length of strings:                    Len
* Loops:                                Loops
* Loops, counting:                      Loops
* Macro definitions, on the command line: Invoking m4
* Macro expansion, tracing:             Trace
* Macro invocation:                     Invocation
* Macros, arguments to:                 Macro Arguments
* Macros, arguments to:                 Arguments
* Macros, displaying definitions:       Dumpdef
* Macros, expansion of:                 Macro expansion
* Macros, how to define new:            Definitions
* Macros, how to delete:                Undefine
* Macros, how to rename:                Defn
* Macros, indirect call of:             Indir
* Macros, quoted arguments to:          Quoting Arguments
* Macros, recursive:                    Loops
* Macros, special arguments to:         Pseudo Arguments
* Macros, temporary redefinition of:    Pushdef
* Messages, printing error:             Errprint
* Multibranches:                        Ifelse
* Names:                                Names
* Options, command line:                Invoking m4
* Output, diverting to files:           Divert
* Output, formatted:                    Format
* Output, saving debugging:             Debug Output
* Pattern substitution:                 Patsubst
* Printing error messages:              Errprint
* Quote delimiters, changing the:       Changequote
* Quoted macro arguments:               Quoting Arguments
* Quoted string:                        Quoted strings
* Recursive macros:                     Loops
* Redefinition of macros, temporary:    Pushdef
* Regular expressions:                  Patsubst
* Regular expressions:                  Regexp
* Renaming macros:                      Defn
* Running Unix commands:                Unix commands
* Saving debugging output:              Debug Output
* Saving input:                         M4wrap
* Search path for included files:       Search Path
* Special arguments to macros:          Pseudo Arguments
* Strings, length of:                   Len
* Substitution by regular expression:   Patsubst
* Substrings, extracting:               Substr
* Temporary filenames:                  Maketemp
* Temporary redefinition of macros:     Pushdef
* Tokens:                               Syntax
* Tracing macro expansion:              Trace
* Translating characters:               Translit
* Undefining macros:                    Undefine
* Unix commands, exit code from:        Sysval
* Unix commands, running:               Unix commands