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• 從 /var/tmp/exercise-one 找出含有你帳號的檔案
• 每人的帳號會出現二次, 因此極大機率會出現在二檔案中
• 將找到的檔案名字寫到一個檔案中, 每個名字一行.
  如為 /var/tmp/exercise-one/Sam/likes/a-duck
  則只需輸入 Sam/likes/a-duck 即可. 注意大小寫.
  此檔案必須置於 ~/unix-1091/exer1 底下.
• 編輯器可用 joe, nano, pico, or vi
• deadline: 2020 Sep 23, 00:05 am

    /var/tmp/exercise-two/Alice/likes/an-ox             <---- a file
    /var/tmp/exercise-two/Emily/has-bought/a-horse      <---- a file
    /var/tmp/exercise-two/Gary/has-bought/a-rhino       <---- a directory
    /var/tmp/exercise-two/Gary/has-bought/a-rhino/less  <---- a file
    /var/tmp/exercise-two/Gary/has-bought/a-rhino/is    <---- a file
    /var/tmp/exercise-two/Gary/has-bought/a-rhino/more  <---- a file
    /var/tmp/exercise-two/Mary/is/a-snake               <---- a file
    

    ~/unix-1091/exer2/
    |---Alice/
    |   `---likes/
    |       `---an-ox
    |---Emily/
    |   `---has-bought/
    |       `---a-horse
    |---Gary/
    |   `---has-bought/
    |       `---a-rhino/
    |           |---is
    |           |---less
    |           `---more
    `---Mary/
        `---is/
            `---a-snake
    

• 有框的為目錄, 其餘為 file.
• 檔案若在 /var/tmp/exercise-three 下可以找到, 則從其處複製, 若找不到, 則為一空檔案.
• 若為 hard link, 則新建出的檔案間的關係也是 hard link.
• 若為 symbolic link, 則新建出的檔案間的關係也是 symbolic link,
  Use a relative pathname to build a symbolic link.
• deadline: 2020 Oct 07, 00:05 am

• 從 /var/tmp/exercise-four 找出含有你帳號的檔案或者是檔名含有你帳號的檔案.
• 每人的帳號會出現三次, 因此極大機率會出現在三檔案中
• 將找到的檔案名字寫到一個檔案中, 每個名字一行.
  如為 /var/tmp/exercise-one/Sam/likes/go-go-s108321001
  則只需輸入 Sam/likes/go-go-s108321001 即可. 注意大小寫.
  此檔案必須置於 ~/unix-1091/exer4 底下.
• 檔案權限需設為 -r--rw-r--
• deadline: 2020 Oct 14, 00:05 am
• 請善用 find, grep 等指令.

• 建立二個執行檔, 名為 do-at, do-cron
  • 每個執行檔的第一個指令須為 date.
  • 每個執行檔最少包含二個指令
  • 用編輯器建立檔案, 再用 chmod 切換執行的權限.
• 用 at 在 2020/Nov/04, 03:00 --- 05:00 執行 do-at 一次, 執行的輸出須 轉向到檔案 output-at.
• 用 crontab 設定在 2020/Nov/04, 01 至 05 這五個小時內, 每小時 執行 do-cron 二次. 執行的輸出須轉向到檔案 output-cron,
• at 及 crontab 所需的程式及輸出檔案皆放在 ~/unix-1091/exer5 下.
• 注意作業要求的檔名, 不符規定者將扣分.
• at 及 crontab 的設定須在 2020/Nov/04, 00:05 前完成.

• For example:

        $ cat IN
        klim 120
        oak -233
        cat -999
        goo 12
        $ ./ex6.sh < IN
        max is klim, value = 120
        min is cat, value = -999
        $ 
      

• deadline: 2020 Nov 18, 00:05 am

• 建立一個 shell 執行檔, 名為 hanoi, 可印出 hanoi tower problem 中 disc 移動的順序

        $ ./hanoi 3     # move 3 discs, from A to C by B
        from A to C
        from A to B
        from C to B
        from A to C
        from B to A
        from B to C
        from A to C
        $ ./hanoi 2     # move 2 discs, from A to C by B
        from A to B
        from A to C
        from B to C
        $
        

• 程式放在 ~/unix-1091/exer7 下.
• Deadline: 2020/Nov/25, 00:05

• Create a shell script which can find the newest file and the biggest file from the arguments. If an argument is a directory, just down one level of tree to find more files. Only ordinary files are interested. Directories and symbolic links, for example, are not considered.
• You may need to consult the man page of 'ls' to find useful options.
• `sed' can be invoked like: 'sed -e '/pattern/d', which deletes lines matching the pattern.
• For example:

        $ ls -l
        total 16
        -rw-r--r-- 1 klim sys  34 Nov  5 16:11 IN
        -rwxr-xr-x 1 klim sys 322 Nov  5 16:10 ex6.sh*
        -rwxr--r-- 1 klim sys 387 Nov 25 18:38 ex8-tmp.sh*
        -rwxr--r-- 1 klim sys 377 Nov 25 18:35 ex8.sh*
        $
        $ ./ex8.sh
        None
        $
        $ ./ex8.sh IN ex6.sh
        newest:  IN
        biggest: ex6.sh
        $
        $ ./ex8.sh .        
        newest:  ex8-tmp.sh
        biggest: ex8-tmp.sh
        $
        $ ./ex8.sh . /var/tmp/killed-idle-process 
        newest:  ex8-tmp.sh
        biggest: /var/tmp/killed-idle-process
        $ 
        

• Put your program under ~/unix-1091/exer8.
• Deadline: 2020/Dec/02, 00:05

• Create an awk script which calculates the sum for each user.
• For example:

        $
        $ cat IN-9
        # oak
        100 23 11 44 
        -99 10
        # klim
        1000 20 3
        1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
        # baga
        -100 -20
        $
        $
        $ ./ex9.awk IN-9
        oak 89
        klim 1233
        baga -120
        $ 
        $
        

• Put your program under ~/unix-1091/exer9.
• Deadline: 2020/Dec/09, 00:05

• Create an awk script which calculates the average for each user.
• For example:

        $ cat IN-10
        klim 10 20 milk 199 joejoe 20
        # klim is appeared again!
        OAk 100 red 200 10 klim 30 # KLIM 2000
        joeJOEjoe 199  marry 20 julie 2000  #joe joe
        $
        $ ./ex10.awk IN-10
        MARRY = 20.00
        RED = 105.00
        JULIE = 2000.00
        OAK = 100.00
        KLIM = 20.00
        JOEJOE = 109.50
        MILK = 199.00
        $ 
        

• Beware of the comment. You have to remove comments first.
• The name are case-insensitive and only first 6 characters are considered.
• Put your program under ~/unix-1091/exer10.
• Deadline: 2020/Dec/23, 00:05