redirection, piping and tee.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Tee"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hi\n"
     ]
    }
   ],
   "source": [
    "echo hi | cat"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "bash: /root/file: Permission denied\n",
      "bash: /root/file: Permission denied\n"
     ]
    },
    {
     "ename": "",
     "evalue": "1",
     "output_type": "error",
     "traceback": []
    }
   ],
   "source": [
    "echo hi | cat > /root/file\n",
    "echo hi > /root/file"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Wrong echo hi sudo > /root/file\n",
    "# Wrong sudo echo hi > /root/file\n",
    "# Wrong sudo echo hi | sudo cat > /root/file"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hi\n"
     ]
    }
   ],
   "source": [
    "echo hi | tee tfile"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hi\n"
     ]
    }
   ],
   "source": [
    "cat tfile"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "echo hi | sudo tee /root/file # Correct\n",
    "echo hi | sudo tee /root/file > /dev/null # if you don't wanna see the output"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hi\n"
     ]
    }
   ],
   "source": [
    "# see whats happening between commands\n",
    "cat tfile | sort | uniq -d | head -3 | grep -iv \"Milad\" > z; cat < z;\n",
    "\n",
    "# lets say some thing is wrong\n",
    "cat tfile | sort | tee check | uniq -d | head -3 | grep -iv \"Milad\" > z; cat < z;\n",
    "cat check"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- - -\n",
    "## Lecture notes\n",
    "\n",
    "- All lecture notes are available at github in `ipynb` format: [https://github.com/ravexina/linux-notes](https://github.com/ravexina/linux-notes). \n",
    "\n",
    "\n",
    "- There are `html` exports of project available at: [https://ravexina.github.io/linux-notes](https://ravexina.github.io/linux-notes).\n",
    "\n",
    "## License\n",
    "<a rel=\"license\" href=\"http://creativecommons.org/licenses/by-nc-sa/4.0/\">\n",
    "<img alt=\"Creative Commons License\" style=\"border-width:0\" src=\"https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png\" />\n",
    "</a>\n",
    "\n",
    "<span property=\"dct:title\">Linux Notes</span> by \n",
    "<a href=\"http://github.com/ravexina/Linux-Notes\" property=\"cc:attributionName\" rel=\"cc:attributionURL\">Milad As (Ravexina)</a> is licensed under a <a rel=\"license\" href=\"http://creativecommons.org/licenses/by-nc-sa/4.0/\">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.\n",
    "\n",
    "- - -\n",
    "\n",
    "<a rel=\"license\" href=\"https://gitlab.com/ravexina/\"><img alt=\"ravexina's gitlab\" style=\"display:inline;border-width:0;height:30px;float:left;\" src=\"img/logo/logo-square.png\" /></a> \n",
    "\n",
    "<a rel=\"license\" href=\"https://github.com/ravexina/\"><img alt=\"ravexina's github\" style=\"float:right;display:inline;border-width:0;height:30px;\" src=\"img/logo/GitHub_Logo.png\" /></a>"
   ]
  }
 ],
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   "display_name": "Bash",
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   "codemirror_mode": "shell",
   "file_extension": ".sh",
   "mimetype": "text/x-sh",
   "name": "bash"
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