2024_Notebook_10_answers.ipynb

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        "**Exercise 1**\n",
        "\n",
        "Practise using for loops.\n",
        "\n",
        "\n",
        "\n",
        "1.   Print all file names in a folder using for loop.\n",
        "\n",
        "\n",
        "\n",
        "```\n",
        "for f in * ; do echo $f ; done #if you are in the folder\n",
        "```\n",
        "\n",
        "```\n",
        "for f in folder/* ; do echo $f ; done #if you run the for loop on files within a specific folder\n",
        "```\n",
        "\n",
        "2.   Print the file names and word count of each file in a folder.\n",
        "\n",
        "\n",
        "```\n",
        "for f in * ; do echo $f ; cat $f | wc -w ; done\n",
        "```\n",
        "\n",
        "\n",
        "3.   Grep and print all perl scripts in your .sh files in a folder. Print also the .sh file names.\n",
        "\n",
        "\n",
        "\n",
        "```\n",
        "for f in *.sh ; do echo $f ; cat $f | egrep \"perl\" ; done\n",
        "```\n",
        "\n",
        "\n",
        "\n",
        "**Exercise 2**\n",
        "\n",
        "More for loops.\n",
        "\n",
        "1.   Run one of your scripts from Notebook9 on two similar files (meaning that the script works equally well on both files) in your folder using a for loop. Print the names and the output in one file.\n",
        "\n",
        "```\n",
        "for f in real* ; do echo $f ; cat $f | ./mostfrequenthashtag.sh ; done > output_mostfreqhashtags.txt\n",
        "```\n",
        "\n",
        "2.   What's the difference if you execute the for loop with `do echo $f` or without it?\n",
        "\n",
        "\n",
        "*   With: the file names are printed in the output file\n",
        "\n",
        "\n",
        "```\n",
        "for f in real* ; do echo $f ; cat $f | ./mostfrequenthashtag.sh ; done > output_mostfreqhashtags.txt\n",
        "```\n",
        "\n",
        "\n",
        "*   Without: only the output is printed in the output file, not the file names\n",
        "\n",
        "\n",
        "```\n",
        "for f in real* ; do cat $f | ./mostfrequenthashtag.sh ; done > output_mostfreqhashtags_nofilename.txt\n",
        "```\n",
        "\n",
        "\n",
        "3.   Copy the files cricket.csv and icehockey.csv from /home/mavela/data-2022/\n",
        "\n",
        "\n",
        "\n",
        "```\n",
        "cp /home/mavela/data-2022/cricket.csv\n",
        "```\n",
        "```\n",
        "cp /home/mavela/data-2022/icehockey.csv\n",
        "```\n",
        "\n",
        "\n",
        "4.   Make a script that counts the words in a file. Exclude numbers and punctuation and other items if needed. Run the script on the cricket and ice hockey files using a for loop and direct the output into separate files.\n",
        "\n",
        "\n",
        "\n",
        "```\n",
        "for f in sports/* ; do echo $f ; cat $f | ./word_count.sh > $f-output.txt ; done\n",
        "```\n",
        "\n",
        "*   Here `do echo $f` prints the file names on the screen and the path to the file (in which folder the file is).\n",
        "\n",
        "\n",
        "\n",
        "> `sports/cricket.csv`\n",
        "\n",
        "> `sports/icehockey.csv`"
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