Support to open files saved from other tools

README.md

@@ -345,6 +345,14 @@ garding Yul.
 
 ```
 
+You can also use bytecode downloaded with other tools, for example using [Foundry's `cast`](https://book.getfoundry.sh/cast/)
+
+```console
+$ cast code --rpc-url https://cloudflare-eth.com 0xD4039ECC40AedA0582036437cf3ec02845DA4C13 > 
+KrakenETHStaking.bytecode
+$ sevm abi KrakenETHStaking.bytecode
+```
+
 ### `dis`
 
 ```console !sevm=bin/sevm.mjs dis --help

bin/sevm.mjs

@@ -80,7 +80,7 @@ async function getBytecode(pathOrAddress, cache, rpcUrl) {
             if (buffer !== '') return Promise.resolve(buffer);
             throw new Error('No input from stdin');
         }
-        return await promises.readFile(pathOrAddress, 'utf8');
+        return (await promises.readFile(pathOrAddress, 'utf8')).trimEnd();
     };
 
     /** @param {unknown} field */
@@ -305,7 +305,7 @@ void yargs(process.argv.slice(2))
     .example('$0 abi 0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e', '')
     .example('$0 sol 0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e', '')
     .example('$0 sol --no-patch 0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e', '')
-    .example('echo 0x600160020160005500 | sevm yul -', 'Use `-` to read bytecode from stdin')
+    .example('echo 0x600160020160005500 | $0 yul -', 'Use `-` to read bytecode from stdin')
     .epilog(
         `[1] See https://docs.soliditylang.org/en/latest/metadata.html for more information regarding Metadata generated by the Solidity compiler.
 [2] See https://docs.soliditylang.org/en/latest/abi-spec.html#abi-json for more information regarding the ABI specification.