diff -uNr coreutils-8.30/lib/getusershell.c coreutils-8.30.mod/lib/getusershell.c
--- coreutils-8.30/lib/getusershell.c	2018-05-14 07:20:31.000000000 +0300
+++ coreutils-8.30.mod/lib/getusershell.c	2019-03-01 20:16:36.731319198 +0200
@@ -56,7 +56,7 @@
 static char const* const default_shells[] =
 {
   ADDITIONAL_DEFAULT_SHELLS
-  "/bin/sh", "/bin/csh", "/usr/bin/sh", "/usr/bin/csh", NULL
+  "@TERMUX_PREFIX@/bin/sh", "@TERMUX_PREFIX@/bin/bash", "@TERMUX_PREFIX@/bin/ash", "@TERMUX_PREFIX@/bin/csh", NULL
 };
 
 /* Index of the next shell in 'default_shells' to return.
diff -uNr coreutils-8.30/lib/tempname.c coreutils-8.30.mod/lib/tempname.c
--- coreutils-8.30/lib/tempname.c	2018-05-14 07:22:38.000000000 +0300
+++ coreutils-8.30.mod/lib/tempname.c	2019-03-01 20:14:04.073892964 +0200
@@ -33,7 +33,7 @@
 
 #include <stdio.h>
 #ifndef P_tmpdir
-# define P_tmpdir "/tmp"
+# define P_tmpdir "@TERMUX_PREFIX@/tmp"
 #endif
 #ifndef TMP_MAX
 # define TMP_MAX 238328
@@ -149,8 +149,8 @@
     {
       if (direxists (P_tmpdir))
         dir = P_tmpdir;
-      else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
-        dir = "/tmp";
+      else if (strcmp (P_tmpdir, "@TERMUX_PREFIX@/tmp") != 0 && direxists ("@TERMUX_PREFIX@/tmp"))
+        dir = "@TERMUX_PREFIX@/tmp";
       else
         {
           __set_errno (ENOENT);
diff -uNr coreutils-8.30/src/mktemp.c coreutils-8.30.mod/src/mktemp.c
--- coreutils-8.30/src/mktemp.c	2018-05-14 07:20:24.000000000 +0300
+++ coreutils-8.30.mod/src/mktemp.c	2019-03-01 20:12:37.923442265 +0200
@@ -270,7 +270,7 @@
           else if (dest_dir_arg && *dest_dir_arg)
             dest_dir = dest_dir_arg;
           else
-            dest_dir = "/tmp";
+            dest_dir = "@TERMUX_PREFIX@/tmp";
 
           if (last_component (template) != template)
             die (EXIT_FAILURE, 0,
@@ -284,7 +284,7 @@
           else
             {
               char *env = getenv ("TMPDIR");
-              dest_dir = (env && *env ? env : "/tmp");
+              dest_dir = (env && *env ? env : "@TERMUX_PREFIX@/tmp");
             }
           if (IS_ABSOLUTE_FILE_NAME (template))
             die (EXIT_FAILURE, 0,
diff -uNr coreutils-8.30/src/sort.c coreutils-8.30.mod/src/sort.c
--- coreutils-8.30/src/sort.c	2018-05-14 07:20:24.000000000 +0300
+++ coreutils-8.30.mod/src/sort.c	2019-03-01 20:13:40.883773368 +0200
@@ -105,7 +105,7 @@
 #endif
 
 #ifndef DEFAULT_TMPDIR
-# define DEFAULT_TMPDIR "/tmp"
+# define DEFAULT_TMPDIR "@TERMUX_PREFIX@/tmp"
 #endif
 
 /* Maximum number of lines to merge every time a NODE is taken from
diff -uNr coreutils-8.30/src/split.c coreutils-8.30.mod/src/split.c
--- coreutils-8.30/src/split.c	2018-05-14 07:20:24.000000000 +0300
+++ coreutils-8.30.mod/src/split.c	2019-03-01 20:15:52.004434545 +0200
@@ -481,7 +481,7 @@
       pid_t child_pid;
       char const *shell_prog = getenv ("SHELL");
       if (shell_prog == NULL)
-        shell_prog = "/bin/sh";
+        shell_prog = "@TERMUX_PREFIX@/bin/sh";
       if (setenv ("FILE", name, 1) != 0)
         die (EXIT_FAILURE, errno,
              _("failed to set FILE environment variable"));
diff -uNr coreutils-8.30/src/tac.c coreutils-8.30.mod/src/tac.c
--- coreutils-8.30/src/tac.c	2018-05-14 07:20:24.000000000 +0300
+++ coreutils-8.30.mod/src/tac.c	2019-03-01 20:13:29.470380749 +0200
@@ -67,7 +67,7 @@
 
 
 #ifndef DEFAULT_TMPDIR
-# define DEFAULT_TMPDIR "/tmp"
+# define DEFAULT_TMPDIR "@TERMUX_PREFIX@/tmp"
 #endif
 
 /* The number of bytes per atomic read. */