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diff -up at-3.1.20/at.c.shell at-3.1.20/at.c
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--- at-3.1.20/at.c.shell	2016-07-01 09:47:13.392684445 +0200
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+++ at-3.1.20/at.c	2016-07-01 09:48:47.679931959 +0200
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@@ -62,11 +62,8 @@
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 #include <stdlib.h>
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 #include <string.h>
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-#ifdef TM_IN_SYS_TIME
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 #include <sys/time.h>
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-#else
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 #include <time.h>
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-#endif
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 #ifdef HAVE_UNISTD_H
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 #include <unistd.h>
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@@ -239,6 +236,12 @@ writefile(time_t runtimer, char queue)
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     int kill_errno;
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     int rc;
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     int mailsize = 128;
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+    struct timeval tv;
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+    struct timezone tz;
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+    long int i;
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+
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+    gettimeofday(&tv, &tz;;
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+    srandom(getpid()+tv.tv_usec);
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 /* Install the signal handler for SIGINT; terminate after removing the
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  * spool file if necessary
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@@ -465,6 +468,9 @@ writefile(time_t runtimer, char queue)
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     fprintf(fp, " || {\n\t echo 'Execution directory "
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 	    "inaccessible' >&2\n\t exit 1\n}\n");
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+    i = random();
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+    fprintf(fp, "${SHELL:-/bin/sh} << \'marcinDELIMITER%08lx\'\n", i);
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+
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     istty = isatty(fileno(stdin));
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     if (istty) {
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 	fprintf(stderr, "at> ");
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@@ -480,7 +486,7 @@ writefile(time_t runtimer, char queue)
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     if (istty) {
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 	fprintf(stderr, "<EOT>\n");
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     }
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-    fprintf(fp, "\n");
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+    fprintf(fp, "\nmarcinDELIMITER%08lx\n", i);
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     if (ferror(fp))
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 	panic("Output error");
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     fflush(fp);