diff --git a/tests/zfs-tests/include/commands.cfg b/tests/zfs-tests/include/commands.cfg
index b247a67ff6..50449633ac 100644
--- a/tests/zfs-tests/include/commands.cfg
+++ b/tests/zfs-tests/include/commands.cfg
@@ -91,7 +91,6 @@ export SYSTEM_FILES_COMMON='arp
     strings
     su
     sudo
-    sum
     swapoff
     swapon
     sync
diff --git a/tests/zfs-tests/tests/functional/acl/acl_common.kshlib b/tests/zfs-tests/tests/functional/acl/acl_common.kshlib
index ba08bcb48b..1e9d736fdf 100644
--- a/tests/zfs-tests/tests/functional/acl/acl_common.kshlib
+++ b/tests/zfs-tests/tests/functional/acl/acl_common.kshlib
@@ -411,7 +411,7 @@ function get_xattr #<obj>
 
 	for xattr in `runat $obj ls | \
 		grep -E -v -e SUNWattr_ro -e SUNWattr_rw` ; do
-		runat $obj sum $xattr
+		runat $obj cksum $xattr
 	done
 }
 
@@ -424,16 +424,14 @@ function get_owner #node
 	typeset value
 
 	if [[ -z $node ]]; then
-		log_fail "node are not defined."
+		log_fail "node is not defined."
 	fi
 
 	if [[ -d $node ]]; then
-		value=$(ls -dl $node | awk '{print $3}')
+		ls -dl $node
 	elif [[ -e $node ]]; then
-		value=$(ls -l $node | awk '{print $3}')
-	fi
-
-	echo $value
+		ls -l $node
+	fi | awk '{print $3}'
 }
 
 #
diff --git a/tests/zfs-tests/tests/functional/cli_root/cli_common.kshlib b/tests/zfs-tests/tests/functional/cli_root/cli_common.kshlib
index 4788de5986..2b84f6a9c1 100644
--- a/tests/zfs-tests/tests/functional/cli_root/cli_common.kshlib
+++ b/tests/zfs-tests/tests/functional/cli_root/cli_common.kshlib
@@ -39,7 +39,7 @@ function get_cksum # <file path>
 }
 
 #
-# Compare the check sum of target files with the original file
+# Compare the checksum of target files with the original file
 #
 
 function compare_cksum #<orig_data> <target_data1>...<target_datan>
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_rollback/zfs_rollback_common.kshlib b/tests/zfs-tests/tests/functional/cli_root/zfs_rollback/zfs_rollback_common.kshlib
index 2eadb68c37..04a8867732 100644
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_rollback/zfs_rollback_common.kshlib
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_rollback/zfs_rollback_common.kshlib
@@ -36,9 +36,9 @@
 # $1 full file name
 function getsum #fname
 {
-	(( ${#1} == 0 )) && \
-		log_fail "Need give file name."
-	return $(sum $1 | awk '{print $1}')
+	typeset sum
+	read -r sum _ < <(cksum "$1")
+	echo $sum
 }
 
 # Define global variable checksum, get the original file sum.
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_001_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_001_pos.ksh
index 77fe116983..e159c1a041 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_001_pos.ksh
@@ -91,7 +91,7 @@ log_assert "Verify that an exported pool can be imported."
 
 setup_filesystem "$DEVICE_FILES" $TESTPOOL1 $TESTFS $TESTDIR1
 
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 _ < <(cksum $MYTESTFILE)
 
 typeset -i i=0
 typeset -i j=0
@@ -125,9 +125,8 @@ while (( i < ${#pools[*]} )); do
 		[[ ! -e $basedir/$TESTFILE0 ]] && \
 			log_fail "$basedir/$TESTFILE0 missing after import."
 
-		checksum2=$(sum $basedir/$TESTFILE0 | awk '{print $1}')
-		[[ "$checksum1" != "$checksum2" ]] && \
-			log_fail "Checksums differ ($checksum1 != $checksum2)"
+		read -r checksum2 _ < <(cksum $basedir/$TESTFILE0)
+		log_must [ "$checksum1" = "$checksum2" ]
 
 		((j = j + 1))
 	done
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_002_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_002_pos.ksh
index 898f93cc90..95ebe0ae29 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_002_pos.ksh
@@ -90,7 +90,7 @@ log_assert "Verify that an exported pool cannot be imported more than once."
 
 setup_filesystem "$DEVICE_FILES" $TESTPOOL1 $TESTFS $TESTDIR1
 
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 _ < <(cksum $MYTESTFILE)
 
 typeset -i i=0
 typeset -i j=0
@@ -126,9 +126,8 @@ while (( i < ${#pools[*]} )); do
 		[[ ! -e $basedir/$TESTFILE0 ]] && \
 			log_fail "$basedir/$TESTFILE0 missing after import."
 
-		checksum2=$(sum $basedir/$TESTFILE0 | awk '{print $1}')
-		[[ "$checksum1" != "$checksum2" ]] && \
-			log_fail "Checksums differ ($checksum1 != $checksum2)"
+		read -r checksum2 _ < <(cksum $basedir/$TESTFILE0)
+		log_must [ "$checksum1" = "$checksum2" ]
 
 		log_mustnot zpool import ${devs[i]} $target
 
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_all_001_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_all_001_pos.ksh
index b384ec9b1f..4ebe6b5914 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_all_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_all_001_pos.ksh
@@ -108,9 +108,8 @@ function checksum_all #alter_root
 		[[ ! -e $file ]] && \
 			log_fail "$file missing after import."
 
-		checksum2=$(sum $file | awk '{print $1}')
-		[[ "$checksum1" != "$checksum2" ]] && \
-			log_fail "Checksums differ ($checksum1 != $checksum2)"
+		read -r checksum2 _ < <(cksum $file)
+		log_must [ "$checksum1" = "$checksum2" ]
 
 		(( id = id + 1 ))
 	done
@@ -122,7 +121,7 @@ function checksum_all #alter_root
 log_assert "Verify that 'zpool import -a' succeeds as root."
 log_onexit cleanup_all
 
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 _ < <(cksum $MYTESTFILE)
 number=1
 
 #
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_001_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_001_pos.ksh
index 3b5167ff03..22cec24ff4 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_001_pos.ksh
@@ -111,7 +111,7 @@ log_assert "Verify that import could handle damaged or missing device."
 CWD=$PWD
 cd $DEVICE_DIR || log_fail "Unable change directory to $DEVICE_DIR"
 
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 _ < <(cksum $MYTESTFILE)
 
 typeset -i i=0
 typeset -i j=0
@@ -199,10 +199,8 @@ while (( i < ${#vdevs[*]} )); do
 			[[ ! -e $basedir/$TESTFILE0 ]] && \
 				log_fail "$basedir/$TESTFILE0 missing after import."
 
-			checksum2=$(sum $basedir/$TESTFILE0 | awk '{print $1}')
-			[[ "$checksum1" != "$checksum2" ]] && \
-				log_fail "Checksums differ ($checksum1 != $checksum2)"
-
+			read -r checksum2 _ < <(cksum $basedir/$TESTFILE0)
+			log_must [ "$checksum1" = "$checksum2" ]
 		done
 
 		((j = j + 1))
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_003_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_003_pos.ksh
index bcb795b19f..ac76f879c2 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_missing_003_pos.ksh
@@ -97,9 +97,8 @@ function verify
 	[[ ! -e $mtpt/$file ]] && \
 		log_fail "$mtpt/$file missing after import."
 
-	checksum2=$(sum $mymtpt/$file | awk '{print $1}')
-	[[ "$checksum1" != "$checksum2" ]] && \
-		log_fail "Checksums differ ($checksum1 != $checksum2)"
+	read -r checksum2 _ < <(cksum $mymtpt/$file)
+	log_must [ "$checksum1" = "$checksum2" ]
 
 	return 0
 
@@ -149,7 +148,7 @@ CWD=$PWD
 log_must cd $DEVICE_DIR
 log_must tar cf $DEVICE_DIR/$DEVICE_ARCHIVE ${DEVICE_FILE}*
 
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 < <(cksum $MYTESTFILE)
 
 typeset -i i=0
 typeset -i j=0
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
index bb6bf86d78..4e49e8d01d 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_rename_001_pos.ksh
@@ -101,7 +101,7 @@ log_onexit cleanup
 log_assert "Verify that an imported pool can be renamed."
 
 setup_filesystem "$DEVICE_FILES" $TESTPOOL1 $TESTFS $TESTDIR1
-checksum1=$(sum $MYTESTFILE | awk '{print $1}')
+read -r checksum1 _ < <(cksum $MYTESTFILE)
 
 typeset -i i=0
 typeset -i j=0
@@ -140,9 +140,8 @@ while (( i < ${#pools[*]} )); do
 		[[ ! -e $basedir/$TESTFILE0 ]] && \
 			log_fail "$basedir/$TESTFILE0 missing after import."
 
-		checksum2=$(sum $basedir/$TESTFILE0 | awk '{print $1}')
-		[[ "$checksum1" != "$checksum2" ]] && \
-			log_fail "Checksums differ ($checksum1 != $checksum2)"
+		read -r checksum2 _ < <(cksum $basedir/$TESTFILE0)
+		log_must [ "$checksum1" = "$checksum2" ]
 
 		log_must zpool export "${pools[i]}-new"
 
diff --git a/tests/zfs-tests/tests/functional/migration/migration.cfg b/tests/zfs-tests/tests/functional/migration/migration.cfg
index 12a5a7799b..a8a24e0a3b 100644
--- a/tests/zfs-tests/tests/functional/migration/migration.cfg
+++ b/tests/zfs-tests/tests/functional/migration/migration.cfg
@@ -102,9 +102,8 @@ export DISK_COUNT ZFS_DISK NONZFS_DISK SINGLE_DISK ZFSSIDE_DISK NONZFSSIDE_DISK
 
 export TESTFILE=/etc/passwd
 export NONZFS_TESTDIR=$TESTDIR/nonzfstestdir
-tmp=`sum $TESTFILE`
-export SUMA=`echo $tmp | awk '{print $1}'`
-export SUMB=`echo $tmp | awk '{print $2}'`
+read -r SUMA SUMB _ < <(cksum $TESTFILE)
+export SUMA SUMB
 export FS_SIZE=1g
 export BNAME=`basename $TESTFILE`
 export DNAME=`dirname $TESTFILE`
diff --git a/tests/zfs-tests/tests/functional/migration/migration.kshlib b/tests/zfs-tests/tests/functional/migration/migration.kshlib
index a2b4ed99b1..2b1955fe93 100644
--- a/tests/zfs-tests/tests/functional/migration/migration.kshlib
+++ b/tests/zfs-tests/tests/functional/migration/migration.kshlib
@@ -99,9 +99,7 @@ function migrate #destdir oldsuma oldsumb cmd
 	$cmd
 	(( $? != 0 )) && return 1
 
-	sumy=`sum ./$BNAME`
-	suma=`echo $sumy | awk '{print $1}'`
-	sumb=`echo $sumy | awk '{print $2}'`
+	read -r suma sumb _ < <(cksum ./$BNAME)
 
 	if (( $oldsuma != $suma )); then
 		log_note "sum values are not the same"
@@ -133,9 +131,7 @@ function migrate_cpio
 	cpio -iv < $archive
 	(( $? != 0 )) && return 1
 
-	sumy=`sum ./$BNAME`
-	suma=`echo $sumy | awk '{print $1}'`
-	sumb=`echo $sumy | awk '{print $2}'`
+	read -r suma sumb _ < <(cksum ./$BNAME)
 
 	if (( $oldsuma != $suma )); then
 		log_note "sum values are not the same"