5 files changed, 14 insertions, 10 deletions
diff --git a/toys/posix/cmp.c b/toys/posix/cmp.c
index 6cd410fc..c573f02e 100644
--- a/toys/posix/cmp.c
+++ b/toys/posix/cmp.c
@@ -4,7 +4,7 @@
  *
  * See http://opengroup.org/onlinepubs/9699919799/utilities/cmp.html
 
-USE_CMP(NEWTOY(cmp, "<2>2ls(silent)(quiet)[!ls]", TOYFLAG_USR|TOYFLAG_BIN))
+USE_CMP(NEWTOY(cmp, "<2>2ls(silent)(quiet)[!ls]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(2)))
 
 config CMP
   bool "cmp"
@@ -81,4 +81,3 @@ void cmp_main(void)
   loopfiles_rw(toys.optargs, O_CLOEXEC|(WARN_ONLY*!(toys.optflags&FLAG_s)), 0,
     do_cmp);
 }
-
diff --git a/toys/posix/env.c b/toys/posix/env.c
index 2de8f690..5c7bb789 100644
--- a/toys/posix/env.c
+++ b/toys/posix/env.c
@@ -6,13 +6,13 @@
  *
  * Deviations from posix: "-" argument and -0
 
-USE_ENV(NEWTOY(env, "^0iu*", TOYFLAG_USR|TOYFLAG_BIN))
+USE_ENV(NEWTOY(env, "^0iu*", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125)))
 
 config ENV
   bool "env"
   default y
   help
-    usage: env [-i] [-u NAME] [NAME=VALUE...] [command [option...]]
+    usage: env [-i] [-u NAME] [NAME=VALUE...] [COMMAND [ARG...]]
 
     Set the environment for command invocation, or list environment variables.
 
diff --git a/toys/posix/nice.c b/toys/posix/nice.c
index ca5e2224..c26f66d3 100644
--- a/toys/posix/nice.c
+++ b/toys/posix/nice.c
@@ -10,7 +10,7 @@ config NICE
   bool "nice"
   default y
   help
-    usage: nice [-n PRIORITY] command [args...]
+    usage: nice [-n PRIORITY] COMMAND [ARG...]
 
     Run a command line at an increased or decreased scheduling priority.
 
@@ -32,7 +32,9 @@ void nice_main(void)
   if (!toys.optflags) TT.n = 10;
 
   errno = 0;
-  if (nice(TT.n)==-1 && errno) perror_exit("Can't set priority");
-
+  if (nice(TT.n)==-1 && errno) {
+    toys.exitval = 125;
+    perror_exit("Can't set priority");
+  }
   xexec(toys.optargs);
 }
diff --git a/toys/posix/nohup.c b/toys/posix/nohup.c
index b302cbe4..e5b526f7 100644
--- a/toys/posix/nohup.c
+++ b/toys/posix/nohup.c
@@ -4,13 +4,13 @@
  *
  * See http://opengroup.org/onlinepubs/9699919799/utilities/nohup.html
 
-USE_NOHUP(NEWTOY(nohup, "<1^", TOYFLAG_USR|TOYFLAG_BIN))
+USE_NOHUP(NEWTOY(nohup, "<1^", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125)))
 
 config NOHUP
   bool "nohup"
   default y
   help
-    usage: nohup COMMAND [ARGS...]
+    usage: nohup COMMAND [ARG...]
 
     Run a command that survives the end of its terminal.
 
@@ -21,6 +21,7 @@ config NOHUP
 
 void nohup_main(void)
 {
+  toys.exitval = 125;
   xsignal(SIGHUP, SIG_IGN);
   if (isatty(1)) {
     close(1);
@@ -38,5 +39,6 @@ void nohup_main(void)
     close(0);
     xopen_stdio("/dev/null", O_RDONLY);
   }
+  toys.exitval = 0;
   xexec(toys.optargs);
 }
diff --git a/toys/posix/sort.c b/toys/posix/sort.c
index 9bf81ebc..9d2f2276 100644
--- a/toys/posix/sort.c
+++ b/toys/posix/sort.c
@@ -7,7 +7,7 @@
  * Deviations from POSIX: Lots.
  * We invented -x
 
-USE_SORT(NEWTOY(sort, USE_SORT_FLOAT("g")"S:T:m" "o:k*t:" "xVbMcszdfirun", TOYFLAG_USR|TOYFLAG_BIN))
+USE_SORT(NEWTOY(sort, USE_SORT_FLOAT("g")"S:T:m" "o:k*t:" "xVbMcszdfirun", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(2)))
 
 config SORT
   bool "sort"
@@ -345,6 +345,7 @@ void sort_main(void)
           if (!temp2 || flag>FLAG_x
             || (flag&(FLAG_u|FLAG_c|FLAG_s|FLAG_z)))
           {
+            toys.exitval = 2;
             error_exit("Unknown key option.");
           }
           // b after , means strip _trailing_ space, not leading.