epm-sh-functions: don't run some command directly

bin/epm-sh-functions

@@ -58,7 +58,7 @@ check_tty()
 
 	is_command tput || return
 	# FreeBSD does not support tput -S
-	echo | tput -S >/dev/null 2>/dev/null || return
+	echo | a= tput -S >/dev/null 2>/dev/null || return
 	[ -z "$USETTY" ] || return
 	export USETTY=1
 }
@@ -756,22 +756,22 @@ is_url()
 }
 
 # print a path to the command if exists in $PATH
-if which which 2>/dev/null >/dev/null ; then
+if a= which which 2>/dev/null >/dev/null ; then
     # the best case if we have which command (other ways needs checking)
     # TODO: don't use which at all, it is binary, not builtin shell command
 print_command_path()
 {
-    which -- "$1" 2>/dev/null
+    a= which -- "$1" 2>/dev/null
 }
-elif type -a type 2>/dev/null >/dev/null ; then
+elif a= type -a type 2>/dev/null >/dev/null ; then
 print_command_path()
 {
-    type -fpP -- "$1" 2>/dev/null
+    a= type -fpP -- "$1" 2>/dev/null
 }
 else
 print_command_path()
 {
-    type "$1" 2>/dev/null | sed -e 's|.* /|/|'
+    a= type "$1" 2>/dev/null | sed -e 's|.* /|/|'
 }
 fi