File less-429-shell.patch of Package less.33612

diff -ru a/filename.c b/filename.c
--- a/filename.c	2020-05-11 23:36:17.000000000 +0200
+++ b/filename.c	2020-05-12 14:01:23.624217811 +0200
@@ -574,7 +574,7 @@
 #if HAVE_SHELL
 	char *shell;
 
-	shell = lgetenv("SHELL");
+	shell = lgetenv("LESSSHELL");
 	if (!isnullenv(shell))
 	{
 		char *scmd;
diff -ru a/less.hlp b/less.hlp
--- a/less.hlp	2020-05-11 23:36:21.000000000 +0200
+++ b/less.hlp	2020-05-12 14:00:58.680162327 +0200
@@ -101,7 +101,7 @@
   ___<_n_a_m_e_>             Display the setting of an option, by name.
   +_c_m_d                 Execute the less cmd each time a new file is examined.
 
-  !_c_o_m_m_a_n_d             Execute the shell command with $SHELL.
+  !_c_o_m_m_a_n_d             Execute the shell command with $LESSSHELL.
   |XX_c_o_m_m_a_n_d            Pipe file between current pos & mark XX to shell command.
   s _f_i_l_e               Save input to a file.
   v                    Edit the current file with $VISUAL or $EDITOR.
diff -ru a/less.nro b/less.nro
--- a/less.nro	2020-05-11 23:36:21.000000000 +0200
+++ b/less.nro	2020-05-12 14:02:02.728304787 +0200
@@ -420,7 +420,7 @@
 A pound sign (#) is replaced by the name of the previously examined file.
 "!!" repeats the last shell command.
 "!" with no shell command simply invokes a shell.
-On Unix systems, the shell is taken from the environment variable SHELL,
+On Unix systems, the shell is taken from the environment variable LESSSHELL,
 or defaults to "sh".
 On MS-DOS and OS/2 systems, the shell is the normal command processor.
 .IP "| <m> shell-command"
@@ -1793,7 +1793,7 @@
 .IP PATH
 User's search path (used to find a lesskey file
 on MS-DOS and OS/2 systems).
-.IP SHELL
+.IP LESSSHELL
 The shell used to execute the !\& command, as well as to expand filenames.
 .IP TERM
 The type of terminal on which
diff -ru a/lsystem.c b/lsystem.c
--- a/lsystem.c	2020-05-11 23:36:17.000000000 +0200
+++ b/lsystem.c	2020-05-12 14:02:25.352355117 +0200
@@ -127,13 +127,13 @@
 
 	/*
 	 * Pass the command to the system to be executed.
-	 * If we have a SHELL environment variable, use
+	 * If we have a LESSSHELL environment variable, use
 	 * <$SHELL -c "command"> instead of just <command>.
 	 * If the command is empty, just invoke a shell.
 	 */
 #if HAVE_SHELL
 	p = NULL;
-	if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
+	if ((shell = lgetenv("LESSSHELL")) != NULL && *shell != '\0')
 	{
 		if (*cmd == '\0')
 			p = save(shell);