diff --git a/t/curse/Makefile b/t/curse/Makefile
index a0b5862..d4872fa 100644
--- a/t/curse/Makefile
+++ b/t/curse/Makefile
@@ -1,13 +1,13 @@
 all:
 	. ./check-1.sh
 	$(MAKE) 1.n0 2.n0 3.n0
-	$(MAKE) $(shell seq 10 | sed 's/$$/.n1/')
+	$(MAKE) $(shell ./seq 10 | sed 's/$$/.n1/')
 	. ./check-2.sh
 
-%.n0: $(shell seq 10 | sed 's/$$/.n1/')
+%.n0: $(shell ./seq 10 | sed 's/$$/.n1/')
 	: >$@
 
-%.n1: $(shell seq 100 | sed 's/$$/.n2/')
+%.n1: $(shell ./seq 100 | sed 's/$$/.n2/')
 	echo n1-$* >$@
 
 .PRECIOUS: %.n2
diff --git a/t/curse/check-2.sh b/t/curse/check-2.sh
index 87061af..6dce157 100644
--- a/t/curse/check-2.sh
+++ b/t/curse/check-2.sh
@@ -1,12 +1,12 @@
 COUNT_IN=$(ls *.count | wc -l)
 COUNT_OUT=$(cat *.count | wc -l)
-if [ "$COUNT_IN" != "$COUNT_OUT" ]; then
+if [ "$COUNT_IN" -ne "$COUNT_OUT" ]; then
 	echo "expected $COUNT_IN individual writes, got $COUNT_OUT" >&2
 	exit 42
 fi
 COUNTALL_IN=$(cat in.countall | wc -l)
 COUNTALL_OUT=$(cat out.countall | wc -l)
-if [ "$COUNTALL_IN" != "$COUNTALL_OUT" ]; then
+if [ "$COUNTALL_IN" -ne "$COUNTALL_OUT" ]; then
 	echo "expected $COUNTALL_IN allwrites, got $COUNTALL_OUT" >&2
 	exit 43
 fi
diff --git a/t/curse/default.n0.do b/t/curse/default.n0.do
index 056a36d..606c961 100644
--- a/t/curse/default.n0.do
+++ b/t/curse/default.n0.do
@@ -1,2 +1,2 @@
-DEPS=$(seq 10 | sed 's/$/.n1/')
+DEPS=$(./seq 10 | sed 's/$/.n1/')
 redo-ifchange $DEPS
diff --git a/t/curse/default.n1.do b/t/curse/default.n1.do
index bb5b3d4..118f26c 100644
--- a/t/curse/default.n1.do
+++ b/t/curse/default.n1.do
@@ -1,3 +1,3 @@
-DEPS=$(seq 100 | sed 's/$/.n2/')
+DEPS=$(./seq 100 | sed 's/$/.n2/')
 redo-ifchange $DEPS
 echo n1-$1
diff --git a/t/curse/seq b/t/curse/seq
new file mode 100755
index 0000000..c6e264b
--- /dev/null
+++ b/t/curse/seq
@@ -0,0 +1,6 @@
+#!/bin/sh
+i=0
+while [ "$i" -lt "$1" ]; do
+	i=$(($i + 1))
+	echo $i
+done
diff --git a/t/curse/test.do b/t/curse/test.do
index ef06622..e8ac2e4 100644
--- a/t/curse/test.do
+++ b/t/curse/test.do
@@ -1,6 +1,6 @@
 . ./check-1.sh
 redo-ifchange 1.n0 2.n0 3.n0
-DEPS=$(seq 10 | sed 's/$/.n1/')
+DEPS=$(./seq 10 | sed 's/$/.n1/')
 redo-ifchange $DEPS
 . ../skip-if-minimal-do.sh
 . ./check-2.sh
diff --git a/t/deps/basic/test.do b/t/deps/basic/test.do
index c1b822f..b35e523 100644
--- a/t/deps/basic/test.do
+++ b/t/deps/basic/test.do
@@ -2,12 +2,12 @@ rm -f *.out *.log
 
 ../../flush-cache.sh
 redo-ifchange 1.out 2.out
-[ "$(cat 1.log | wc -l)" = 1 ] || exit 55
-[ "$(cat 2.log | wc -l)" = 1 ] || exit 56
+[ "$(cat 1.log | wc -l)" -eq 1 ] || exit 55
+[ "$(cat 2.log | wc -l)" -eq 1 ] || exit 56
 ../../flush-cache.sh
 touch 1.in
 redo-ifchange 1.out 2.out
-[ "$(cat 2.log | wc -l)" = 1 ] || exit 58
+[ "$(cat 2.log | wc -l)" -eq 1 ] || exit 58
 . ../../skip-if-minimal-do.sh
-[ "$(cat 1.log | wc -l)" = 2 ] || exit 57
+[ "$(cat 1.log | wc -l)" -eq 2 ] || exit 57
 
diff --git a/t/deps/dirtest/test.do b/t/deps/dirtest/test.do
index b39be4d..08541ed 100644
--- a/t/deps/dirtest/test.do
+++ b/t/deps/dirtest/test.do
@@ -10,7 +10,7 @@ redo-ifchange t1
 C1="$(wc -l <dir1/log)"
 C2="$(wc -l <log)"
 . ../../skip-if-minimal-do.sh
-if [ "$C1" != 1 -o "$C2" != 2 ]; then
+if [ "$C1" -ne 1 -o "$C2" -ne 2 ]; then
 	echo "failed: t1>t1, c1=$C1, c2=$C2" >&2
 	exit 55
 fi
diff --git a/t/deps/doublestatic.do b/t/deps/doublestatic.do
index a385cc5..13cb2b6 100644
--- a/t/deps/doublestatic.do
+++ b/t/deps/doublestatic.do
@@ -8,4 +8,4 @@ redo-ifchange static1 static2
 
 COUNT=$(wc -l <static.log)
 . ../skip-if-minimal-do.sh
-[ "$COUNT" = 4 ] || exit 55
+[ "$COUNT" -eq 4 ] || exit 55
diff --git a/t/deps/gentest.do b/t/deps/gentest.do
index b748c4c..d457b76 100644
--- a/t/deps/gentest.do
+++ b/t/deps/gentest.do
@@ -18,4 +18,4 @@ redo-ifchange genfile1
 
 COUNT=$(wc -l <genfile.log)
 . ../skip-if-minimal-do.sh
-[ "$COUNT" = 2 ] || exit 77
+[ "$COUNT" -eq 2 ] || exit 77
diff --git a/t/deps/test2.do b/t/deps/test2.do
index 470cd2b..0a10058 100644
--- a/t/deps/test2.do
+++ b/t/deps/test2.do
@@ -3,7 +3,7 @@ redo t2
 redo t2
 OUT=$(cat t2.count | wc -l)
 . ../skip-if-minimal-do.sh
-if [ "$OUT" != 2 ]; then
+if [ "$OUT" -ne 2 ]; then
 	echo "t2: expected 2"
 	exit 43
 fi
diff --git a/t/makedir2.do b/t/makedir2.do
index 07796d1..9fa784c 100644
--- a/t/makedir2.do
+++ b/t/makedir2.do
@@ -5,4 +5,4 @@ touch makedir/outfile
 ./flush-cache.sh
 redo-ifchange makedir
 COUNT=$(wc -l <makedir.log)
-[ "$COUNT" = 1 ] || exit 99
+[ "$COUNT" -eq 1 ] || exit 99