(figure from "Starting Forth")
- 從 /var/tmp/exercise-one 找出含有你帳號的檔案
- 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/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-1122/exer1 底下. - 編輯器可用 joe, nano, pico
- deadline: 2024/Feb/28, 00:05 am
- 從 /var/tmp/exercise-two 目錄底下找出自己的目錄及檔案,
並複製到 ~/unix-1122/exer2 下. 如果有以下目錄及檔案/var/tmp/exercise-two/Bob/has-bought/a-cow /var/tmp/exercise-two/Bob/has-bought/a-deer /var/tmp/exercise-two/Bob/has-bought/a-dog /var/tmp/exercise-two/David/is/a-tiger /var/tmp/exercise-two/David/is/a-tiger/fun /var/tmp/exercise-two/David/is/a-tiger/is /var/tmp/exercise-two/David/is/a-tiger/it
則在你的 exer2 下建立如下對應的結構.~/unix-1122/exer2 |---Bob | `---has-bought | |---a-cow | |---a-deer | `---a-dog `---David `---is `---a-tiger |---fun |---is `---it - 注意: 若是檔案的話, 內容必須一樣, 也就是說要用複製的.
- deadline: 2024 March 13, 00:05 am
在 ~/unix-1122/exer3 建出一個目錄結構, 與下圖一致.
- 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: 2024 March 20, 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-four/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-1122/exer4 底下.
- 檔案權限需設為 -r--rw-r--
- deadline: 2024 March 27, 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 2024/Apr/24, 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 2024/Apr/24, 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,
- crontab 的設定請用一行完成.
- at 及 crontab 所需的程式及輸出檔案皆放在 ~/unix-1122/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 2024/Apr/24, 00:05 前完成.
- Write a bash program to calculate the sum of a sequence
- The sequence is defined by three arguments. If the program is called like: ./ex6-sum.sh a b step, then the sequence is a, a+step, a+2*step,.. until a+k*step is over b which means, depending on the sign of step, either greater or less than b.
- Your program should check the number of arguments.
- Your program should be executable.
- For example:
$ ./ex6-sum.sh 1 2 # number of argument != 3 usage: a b step $ ./ex6-sum.sh # number of argument != 3 usage: a b step $ ./ex6-sum.sh 1 2 3 # 1,4,7 ... ==> 1 1 $ ./ex6-sum.sh 1 2 1 # 1,2,3 ... ==> 1+2 = 3 3 $ ./ex6-sum.sh -10 -3 2 # -10,-8,... ==> -10-8... = -28 -28 $ ./ex6-sum.sh -10 -3 1 -52 $ ./ex6-sum.sh -10 -3 4 # -10,-6,-2,2,... ==> -10-6= -16 -16 $ ./ex6-sum.sh 10 -3 2 # 10 > -3, so 0 0 $ ./ex6-sum.sh 10 -3 -2 # 10,8,6,...-2,-4,.. ==> 10+8+...-2 = 28 28 $ ./ex6-sum.sh 10 -3 -4 # 10,6,2,-2,-6... ==> 10+6+2-2 = 16 16 $ ./ex6-sum.sh 10 -3 -6 12 $ - deadline: 2024 May 01, 00:05 am
- Write a bash program which extracts information either from
stdin or files. The collected information then are merged,
sorted and printed in a line.
- This exercise is for practicing combining programs with pipes, so grep and sort must be used at least once respectively.
- If your program uses temporary files, make sure their pathnames are right. Do not forget to remove them after execution.
- Your program should be executable.
- For example:
$ ./ex7-extract.sh usage: ./ex7-extract.sh keyword [file] .... $ ./ex7-extract.sh klim OK it is not klim milk is milk klim got $1000 $1000 OK got is it not <----- ctrl-D pressed $ $ cat IN-a oak is not klim klim is good ok it is fine $ $ cat IN-b 192390 klim klim tooyoung ok it is fine $ $ ./ex7-extract.sh klim IN-a good is is not oak $ $ ./ex7-extract.sh klim IN-a IN-b 192390 good is is not oak tooyoung $ - Put your program under ~/unix-1122/exer7.
- deadline: 2024 May 08, 00:05 am