Favor $HOME over '~' in text

As perhaps not all shells support '~' as a shortcut for $HOME, use $HOME
instead to clarify text.

doc/getting_started.texi

@@ -231,9 +231,18 @@ system hierarchy.  Perhaps you want to install to your home directory
 instead:
 
 @example
-@command{./configure --prefix=~/local}
+@command{./configure --prefix=$HOME/local}
 @end example
 
+@quotation Note
+For practice you may wish to start out using the
+@samp{--prefix=$HOME/local} option to install the Hamlib files into
+your home directory and avoid overwriting any version of Hamlib
+installed into the system directories.  The code examples in the
+remainder of this manual will assume Hamlib has been installed to
+@samp{$HOME/local}.
+@end quotation
+
 All of the files will be installed in the @file{local} directory of
 your home directory.  @file{local} will be created if it does not
 exist during installation as will several other directories in it.

doc/utility_programs.texi

@@ -374,27 +374,27 @@ using @command{rigctl} to turn AI mode on or off, pass this option.
 @item -i
 @itemx --read-history
 Read previously saved command and argument history from a file
-(default '@file{~/.rigctl_history}') for the current session.
+(default '@file{$HOME/.rigctl_history}') for the current session.
 Available when @command{rigctl} is built with Readline support.
 
 @strong{N.B.} To read a history file stored in another directory, set
 the @env{RIGCTL_HIST_DIR} environment variable, e.g.@:
-'@kbd{RIGCTL_HIST_DIR=~/tmp rigctl -i}'.  When @env{RIGCTL_HIST_DIR}
-is not set, the value of @env{HOME} is used.
+'@kbd{RIGCTL_HIST_DIR=$HOME/tmp rigctl -i}'.  When
+@env{RIGCTL_HIST_DIR} is not set, the value of @env{HOME} is used.
 
 @item -I
 @itemx --save-history
 Write current session (and previously saved session(s) if @option{-i}
 option is also given) command and argument history to a file (default
-'@file{~/.rigctl_history}') at the end of the current session.
+'@file{$HOME/.rigctl_history}') at the end of the current session.
 Complete commands with arguments are saved as a single line to be
 recalled and used or edited.  Available when @command{rigctl} is built
 with Readline support.
 
 To write a history file in another directory, set the
 @env{RIGCTL_HIST_DIR} environment variable, e.g.@:
-'@kbd{RIGCTL_HIST_DIR=~/tmp rigctl -I}'.  When @env{RIGCTL_HIST_DIR}
-is not set, the value of @env{HOME} is used.
+'@kbd{RIGCTL_HIST_DIR=$HOME/tmp rigctl -I}'.  When
+@env{RIGCTL_HIST_DIR} is not set, the value of @env{HOME} is used.
 
 @item -v
 @itemx --verbose
@@ -1006,7 +1006,7 @@ their defaults as described in the
 @url{http://cnswww.cns.cwru.edu/php/chet/readline/rluserman.html,
 Readline manual} although @command{rigctl} sets the name @code{rigctl}
 which can be used in @code{Conditional Init Constructs} in the
-Readline Init File (@file{~/.inputrc} by default) for custom
+Readline Init File (@file{$HOME/.inputrc} by default) for custom
 keybindings unique to @command{rigctl}.
 
 Command history is available with Readline support as described in the
@@ -1028,12 +1028,12 @@ This is useful to save a set of commands and then read them later but
 not write the modified history for a consistent set of test commands
 in interactive mode, for example.
 
-History is stored in @file{~/.rigctl_history} by default although the
-destination directory may be changed by setting the
+History is stored in @file{$HOME/.rigctl_history} by default although
+the destination directory may be changed by setting the
 @env{RIGCTL_HIST_DIR} environment variable.  When
-@env{RIGCTL_HIST_DIR} is unset, the value of the @env{HOME} environment
-variable is used instead.  Only the destination directory may be
-changed at this time.
+@env{RIGCTL_HIST_DIR} is unset, the value of the @env{HOME}
+environment variable is used instead.  Only the destination directory
+may be changed at this time.
 
 If Readline support is not found at configure time the original
 internal command handler is used.  Readline is not used for
@@ -1313,26 +1313,26 @@ exit.
 @item -i
 @itemx --read-history
 Read previously saved command and argument history from a file
-(default '@file{~/.rotctl_history}') for the current session.
+(default '@file{$HOME/.rotctl_history}') for the current session.
 Available when @command{rotctl} is built with Readline support.
 
 @strong{N.B.} To read a history file stored in another directory, set
 the @env{ROTCTL_HIST_DIR} environment variable, e.g.@:
-'@kbd{ROTCTL_HIST_DIR=~/tmp rotctl -i}'.  When @env{ROTCTL_HIST_DIR}
+'@kbd{ROTCTL_HIST_DIR=$HOME/tmp rotctl -i}'.  When @env{ROTCTL_HIST_DIR}
 is not set, the value of @env{HOME} is used.
 
 @item -I
 @itemx --save-history
 Write current session (and previously saved session(s) if @option{-i}
 option is also given) command and argument history to a file (default
-'@file{~/.rotctl_history}') at the end of the current session.
+'@file{$HOME/.rotctl_history}') at the end of the current session.
 Complete commands with arguments are saved as a single line to be
 recalled and used or edited.  Available when @command{rotctl} is built
 with Readline support.
 
 To write a history file in another directory, set the
 @env{ROTCTL_HIST_DIR} environment variable, e.g.@:
-'@kbd{ROTCTL_HIST_DIR=~/tmp rotctl -I}'.  When @env{ROTCTL_HIST_DIR}
+'@kbd{ROTCTL_HIST_DIR=$HOME/tmp rotctl -I}'.  When @env{ROTCTL_HIST_DIR}
 is not set, the value of @env{HOME} is used.
 
 @item -v
@@ -1538,7 +1538,7 @@ their defaults as described in the
 @url{http://cnswww.cns.cwru.edu/php/chet/readline/rluserman.html,
 Readline manual} although @command{rotctl} sets the name @code{rotctl}
 which can be used in @code{Conditional Init Constructs} in the
-Readline Init File (@file{~/.inputrc} by default) for custom
+Readline Init File (@file{$HOME/.inputrc} by default) for custom
 keybindings unique to @command{rotctl}.
 
 Command history is available with Readline support as described in the
@@ -1560,7 +1560,7 @@ This is useful to save a set of commands and then read them later but
 not write the modified history for a consistent set of test commands
 in interactive mode, for example.
 
-History is stored in @file{~/.rotctl_history} by default although the
+History is stored in @file{$HOME/.rotctl_history} by default although the
 destination directory may be changed by setting the
 @env{ROTCTL_HIST_DIR} environment variable.  When
 @env{ROTCTL_HIST_DIR} is unset, the value of the @env{HOME} environment