updates

packages/bare-os-coreutils/src/tail.js

@@ -0,0 +1,29 @@
+async function run(ctx, argv) {
+  const vfs = ctx.vfs
+  let n = 10
+  let start = 1
+  if (argv[1] === '-n' && argv[2]) {
+    n = parseInt(argv[2], 10) || 10
+    start = 3
+  }
+  const files = argv.slice(start).filter((a) => a !== '--')
+  const take = (s) => {
+    let lines = s.split('\n')
+    if (s.endsWith('\n') && lines[lines.length - 1] === '') lines.pop()
+    const slice = lines.length <= n ? lines : lines.slice(-n)
+    ctx.console.log(slice.join('\n'))
+  }
+  if (!files.length) {
+    take(bareStdin(ctx))
+    return
+  }
+  for (const f of files) {
+    const buf = await vfs.readFile(f)
+    if (!buf) {
+      ctx.console.error('tail: ' + f + ': No such file')
+      continue
+    }
+    if (files.length > 1) ctx.console.log('==> ' + f + ' <==')
+    take(ctx.b4a.toString(buf))
+  }
+}