diff options
Diffstat (limited to 'doc/gawk.texi')
| -rw-r--r-- | doc/gawk.texi | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/doc/gawk.texi b/doc/gawk.texi index 4928769d..256e0c13 100644 --- a/doc/gawk.texi +++ b/doc/gawk.texi @@ -4128,6 +4128,7 @@ that this option may disappear in a future version of @command{gawk}. Force the use of the locale's decimal point character when parsing numeric input data (@pxref{Locales}). +@cindex pretty printing @item @option{-o}[@var{file}] @itemx @option{--pretty-print}[@code{=}@var{file}] @cindex @option{-o} option @@ -15345,8 +15346,8 @@ is to simply say @samp{FS = FS}, perhaps with an explanatory comment. @cindex @command{gawk}, @code{IGNORECASE} variable in @cindex @code{IGNORECASE} variable @cindex differences in @command{awk} and @command{gawk}, @code{IGNORECASE} variable -@cindex case sensitivity, and string comparisons -@cindex case sensitivity, and regexps +@cindex case sensitivity, string comparisons and +@cindex case sensitivity, regexps and @cindex regular expressions, case sensitivity @item IGNORECASE # If @code{IGNORECASE} is nonzero or non-null, then all string comparisons @@ -16572,8 +16573,8 @@ automatically converts it to a string. @cindex @command{gawk}, @code{IGNORECASE} variable in @cindex case sensitivity, array indices and -@cindex arrays, and @code{IGNORECASE} variable -@cindex @code{IGNORECASE} variable, and array indices +@cindex arrays, @code{IGNORECASE} variable and +@cindex @code{IGNORECASE} variable, array indices and The value of @code{IGNORECASE} has no effect upon array subscripting. The identical string value used to store an array element must be used to retrieve it. @@ -17056,7 +17057,7 @@ sorting arrays; see @ref{Array Sorting Functions}. @cindex numbers, as array subscripts @cindex arrays, numeric subscripts @cindex subscripts in arrays, numbers as -@cindex @code{CONVFMT} variable, and array subscripts +@cindex @code{CONVFMT} variable, array subscripts and An important aspect to remember about arrays is that @emph{array subscripts are always strings}. When a numeric value is used as a subscript, it is converted to a string value before being used for subscripting @@ -17213,7 +17214,7 @@ if (4 in foo) print "This will never be printed" @end example -@cindex null strings, and deleting array elements +@cindex null strings, deleting array elements and It is important to note that deleting an element is @emph{not} the same as assigning it a null value (the empty string, @code{""}). For example: @@ -17308,7 +17309,7 @@ languages, including @command{awk}) to refer to an element of a two-dimensional array named @code{grid} is with @code{grid[@var{x},@var{y}]}. -@cindex @code{SUBSEP} variable, and multidimensional arrays +@cindex @code{SUBSEP} variable, multidimensional arrays and Multidimensional arrays are supported in @command{awk} through concatenation of indices into one string. @command{awk} converts the indices into strings @@ -23735,7 +23736,7 @@ uses these functions. @cindex functions, library, group database@comma{} reading @cindex group database, reading @cindex database, group, reading -@cindex @code{PROCINFO} array, and group membership +@cindex @code{PROCINFO} array, group membership and @cindex @code{getgrent()} function (C library) @cindex @code{getgrent()} user-defined function @cindex groups@comma{} information about @@ -25034,7 +25035,7 @@ $ @kbd{id} @print{} uid=1000(arnold) gid=1000(arnold) groups=1000(arnold),4(adm),7(lp),27(sudo) @end example -@cindex @code{PROCINFO} array, and user and group ID numbers +@cindex @code{PROCINFO} array, user and group ID numbers and This information is part of what is provided by @command{gawk}'s @code{PROCINFO} array (@pxref{Built-in Variables}). However, the @command{id} utility provides a more palatable output than just @@ -28449,7 +28450,7 @@ both arrays use the values. @c Document It And Call It A Feature. Sigh. @cindex @command{gawk}, @code{IGNORECASE} variable in @cindex arrays, sorting, and @code{IGNORECASE} variable -@cindex @code{IGNORECASE} variable, and array sorting functions +@cindex @code{IGNORECASE} variable, array sorting functions and Because @code{IGNORECASE} affects string comparisons, the value of @code{IGNORECASE} also affects sorting for both @code{asort()} and @code{asorti()}. Note also that the locale's sorting order does @emph{not} @@ -28697,7 +28698,7 @@ or @code{getline}. @end quotation @cindex @command{gawk}, @code{PROCINFO} array in -@cindex @code{PROCINFO} array, and communications via ptys +@cindex @code{PROCINFO} array, communications via ptys and You may also use pseudo-ttys (ptys) for two-way communication instead of pipes, if your system supports them. This is done on a per-command basis, by setting a special element @@ -28982,8 +28983,8 @@ Here is the @file{awkprof.out} that results from running the illustrates that @command{awk} programmers sometimes get up very early in the morning to work): -@cindex @code{BEGIN} pattern, and profiling -@cindex @code{END} pattern, and profiling +@cindex @code{BEGIN} pattern, profiling and +@cindex @code{END} pattern, profiling and @example # gawk profile, created Mon Sep 29 05:16:21 2014 @@ -29213,6 +29214,7 @@ keyboard. The @code{INT} signal is generated by the @kbd{Ctrl-c} or @kbd{Ctrl-BREAK} key, while the @code{QUIT} signal is generated by the @kbd{Ctrl-\} key. +@cindex pretty printing Finally, @command{gawk} also accepts another option, @option{--pretty-print}. When called this way, @command{gawk} ``pretty-prints'' the program into @file{awkprof.out}, without any execution counts. @@ -29222,6 +29224,8 @@ Once upon a time, the @option{--pretty-print} option would also run your program. This is is no longer the case. @end quotation +@cindex profiling, pretty-printing, difference with +@cindex pretty-printing, profiling, difference with There is a significant difference between the output created when profiling, and that created when pretty-printing. Pretty-printed output preserves the original comments that were in the program, although their @@ -29247,7 +29251,7 @@ Because the internal representation of your program is formatted to recreate an @command{awk} program, profiling and pretty-printing automatically disable @command{gawk}'s default optimizations. -Pretty printing also preserves the original format of numeric +Profiling and pretty-printing also preserve the original format of numeric constants; if you used an octal or hexadecimal value in your source code, it will appear that way in the output. |