Remove basename(1). Clean up/shorten some coreutils pipelines

Basenames that remain, in cmd/zed/zed.d/statechange-led.sh:
	dev=$(basename "$(echo "$therest" | awk '{print $(NF-1)}')")
	vdev=$(basename "$ZEVENT_VDEV_PATH")
I don't wanna interfere with #11988

scripts/zfs-tests.sh:
	SINGLETESTFILE=$(basename "$SINGLETEST")
tests/zfs-tests/tests/functional/cli_user/zfs_list/zfs_list.kshlib:
	ACTUAL=$(basename $dataset)
	ACTUAL=$(basename $dataset)
tests/zfs-tests/tests/functional/cli_user/zpool_iostat/
	zpool_iostat_-c_homedir.ksh:
	typeset USER_SCRIPT=$(basename "$USER_SCRIPT_FULL")
tests/zfs-tests/tests/functional/cli_user/zpool_iostat/
	zpool_iostat_-c_searchpath.ksh:
	typeset CMD_1=$(basename "$SCRIPT_1")
	typeset CMD_2=$(basename "$SCRIPT_2")
tests/zfs-tests/tests/functional/cli_user/zpool_status/
	zpool_status_-c_homedir.ksh:
	typeset USER_SCRIPT=$(basename "$USER_SCRIPT_FULL")
tests/zfs-tests/tests/functional/cli_user/zpool_status/
	zpool_status_-c_searchpath.ksh
	typeset CMD_1=$(basename "$SCRIPT_1")
	typeset CMD_2=$(basename "$SCRIPT_2")
tests/zfs-tests/tests/functional/migration/migration.cfg:
	export BNAME=`basename $TESTFILE`
tests/zfs-tests/tests/perf/perf.shlib:
	typeset logbase="$(get_perf_output_dir)/$(basename \
tests/zfs-tests/tests/perf/perf.shlib:
	typeset logbase="$(get_perf_output_dir)/$(basename \

These are potentially Of Directories, where basename is actually
useful

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12652

scripts/kmodtool

@@ -446,7 +446,7 @@ print_rpmtemplate ()
 
 myprog_help ()
 {
-	echo "Usage: $(basename ${0}) [OPTIONS]"
+	echo "Usage: ${0##*/} [OPTIONS]"
 	echo $'\n'"Creates a template to be used during kmod building"
 	echo $'\n'"Available options:"
 	echo " --filterfile <file>  -- filter the results with grep --file <file>"

scripts/zfs-tests.sh

@@ -90,7 +90,7 @@ cleanup_freebsd_loopback() {
 
 cleanup_linux_loopback() {
 	for TEST_LOOPBACK in ${LOOPBACKS}; do
-		LOOP_DEV=$(basename "$TEST_LOOPBACK")
+		LOOP_DEV="${TEST_LOOPBACK##*/}"
 		DM_DEV=$(sudo "${DMSETUP}" ls 2>/dev/null | \
 		    grep "${LOOP_DEV}" | cut -f1)
 
@@ -606,7 +606,7 @@ if [ -z "${DISKS}" ]; then
 				TEST_LOOPBACK=$(sudo "${LOSETUP}" -f)
 				sudo "${LOSETUP}" "${TEST_LOOPBACK}" "${TEST_FILE}" ||
 				    fail "Failed: ${TEST_FILE} -> ${TEST_LOOPBACK}"
-				BASELOOPBACK=$(basename "$TEST_LOOPBACK")
+				BASELOOPBACK="${TEST_LOOPBACK##*/}"
 				DISKS="$DISKS $BASELOOPBACK"
 				LOOPBACKS="$LOOPBACKS $TEST_LOOPBACK"
 			fi

scripts/zfs.sh

@@ -91,7 +91,8 @@ check_modules_linux() {
 
 	for KMOD in $KMOD_SPL $KMOD_ZAVL $KMOD_ZNVPAIR $KMOD_ZUNICODE $KMOD_ZCOMMON \
 	    $KMOD_ZLUA $KMOD_ZZSTD $KMOD_ICP $KMOD_ZFS; do
-		NAME=$(basename "$KMOD" .ko)
+		NAME="${KMOD##*/}"
+		NAME="${NAME%.ko}"
 
 		if lsmod | grep -E -q "^${NAME}"; then
 			LOADED_MODULES="$LOADED_MODULES\t$NAME\n"
@@ -172,7 +173,8 @@ load_modules_linux() {
 unload_module_linux() {
 	KMOD=$1
 
-	NAME=$(basename "$KMOD" .ko)
+	NAME="${KMOD##*/}"
+	NAME="${NAME%.ko}"
 	FILE=$(modinfo "$KMOD" | awk '/^filename:/ {print $2}')
 	VERSION=$(modinfo "$KMOD" | awk '/^version:/ {print $2}')
 
@@ -198,8 +200,9 @@ unload_modules_freebsd() {
 unload_modules_linux() {
 	for KMOD in $KMOD_ZFS $KMOD_ICP $KMOD_ZZSTD $KMOD_ZLUA $KMOD_ZCOMMON \
 	    $KMOD_ZUNICODE $KMOD_ZNVPAIR  $KMOD_ZAVL $KMOD_SPL; do
-		NAME=$(basename "$KMOD" .ko)
-		USE_COUNT=$(lsmod | grep -E "^${NAME} " | awk '{print $3}')
+		NAME="${KMOD##*/}"
+		NAME="${NAME%.ko}"
+		USE_COUNT=$(lsmod | awk '/^'"${NAME}"'/ {print $3}')
 
 		if [ "$USE_COUNT" = "0" ] ; then
 			unload_module_linux "$KMOD" || return 1

scripts/zimport.sh

@@ -486,7 +486,7 @@ for TAG in $POOL_TAGS; do
 		    "$POOL_DIR_COPY" || \
 		    fail "Failed to copy $POOL_DIR_PRISTINE to $POOL_DIR_COPY"
 		POOL_NAME=$($ZPOOL_CMD import -d "$POOL_DIR_COPY" | \
-		    awk '/pool:/ { print $2; exit 0 }')
+		    awk '/pool:/ { print $2; exit }')
 
 		if ! $ZPOOL_CMD import -N -d "$POOL_DIR_COPY"
 		    "$POOL_NAME" &>/dev/null; then