Improve shell script

example/amount.zsh

 #!/usr/bin/env zsh
-cd "$(dirname "$0")" || exit 1
-path=("$PWD/../build/src" $path[@])
+path=("${0:A:h}/../build/src" $path[@])
 
 wasms=(
-    $PWD/styled-jsx/mappings.wasm
-    $PWD/zlib-wasm/zlib-sample.wasm
-    $PWD/ammo.js/ammo.js/builds/ammo.wasm.wasm
+    "${0:A:h}/styled-jsx/mappings.wasm"
+    "${0:A:h}/zlib-wasm/zlib-sample.wasm"
+    "${0:A:h}/ammo.js/ammo.js/builds/ammo.wasm.wasm"
 )
 
 echo "name, size[B], funcs, opswap[bit], funcord[bit]"
@@ -15,5 +14,5 @@ do
     funcs="$(funccnt "$i")"
     funcord="$((snpi "$i" funcord "Test" > /dev/null) |& awk '{print $1}')"
     opswap="$((snpi "$i" opswap "Test" > /dev/null) |& awk '{print $1}')"
-    echo "${i/$PWD\//}, $size, $funcs, $opswap, $funcord"
+    echo "${i/${0:A:h}\//}, $size, $funcs, $opswap, $funcord"
 done