Instructions and shell script here assumes bash shell. Tested on GNU bash, version 4.3.46
- For example, the first exercise for GNU_grep
- directory:
ex01_basic_match - question file:
ex01_basic_match.txt - solution reference:
.ref_solutions/ex01_basic_match.txt
- directory:
- Each exercise contains one or more question to be solved
- The script
solvewill assist in checking solutions
$ git clone https://github.com/learnbyexample/Command-line-text-processing.git
$ cd Command-line-text-processing/exercises/GNU_grep/
$ ls
ex01_basic_match ex02_basic_options ex03_multiple_string_match solve
ex01_basic_match.txt ex02_basic_options.txt ex03_multiple_string_match.txt
$ find -name 'ex01*'
./.ref_solutions/ex01_basic_match.txt
./ex01_basic_match
./ex01_basic_match.txt- Solving the questions
- Go to the exercise folder
- Use
lsto see input file(s) - To see the problems for that exercise, follow the steps below
$ cd ex01_basic_match
$ ls
sample.txt
$ # to see the questions
$ source ../solve -q
1) Match lines containing the string: day
2) Match lines containing the string: it
3) Match lines containing the string: do you
$ # or open the questions file with your fav editor
$ gvim ../$(basename "$PWD").txt
$ # create an alias to use from any ex* directory
$ alias oq='gvim ../$(basename "$PWD").txt'
$ oq- Submitting solutions one by one
- immediately after executing command that answers a question, call the
solvescript
- immediately after executing command that answers a question, call the
$ grep 'day' sample.txt
Good day
Today is sunny
$ source ../solve -s
---------------------------------------------
Match for question 1:
Submitted solution: grep 'day' sample.txt
Reference solution: grep 'day' sample.txt
---------------------------------------------- Submit all at once
- by editing the
../$(basename "$PWD").txtfile directly - the answer should replace the empty line immediately following the question
- by editing the
- Note
- there are different ways to solve the same question
- but for specific exercise like GNU_grep try to solve using
greponly - also, remember that
evalis used to check equivalence. So be sure of commands submitted
$ cat ../$(basename "$PWD").txt
1) Match lines containing the string: day
grep 'day' sample.txt
2) Match lines containing the string: it
sed -n '/it/p' sample.txt
3) Match lines containing the string: do you
echo 'How do you do?'
$ source ../solve
---------------------------------------------
Match for question 1:
Submitted solution: grep 'day' sample.txt
Reference solution: grep 'day' sample.txt
---------------------------------------------
---------------------------------------------
Match for question 2:
Submitted solution: sed -n '/it/p' sample.txt
Reference solution: grep 'it' sample.txt
---------------------------------------------
---------------------------------------------
Match for question 3:
Submitted solution: echo 'How do you do?'
Reference solution: grep 'do you' sample.txt
---------------------------------------------
All Pass - Then move on to next exercise directory
- Create aliases for different commands for easy use, after checking that the aliases are available of course
$ type cs cq ca nq pq
bash: type: cs: not found
bash: type: cq: not found
bash: type: ca: not found
bash: type: nq: not found
bash: type: pq: not found
$ alias cs='source ../solve -s'
$ alias cq='source ../solve -q'
$ alias ca='source ../solve'
$ # to go to directory of next question
$ nq() { d=$(basename "$PWD"); nd=$(printf "../exd*/" $((${d:2:2} 1))); cd $nd ; }
$ # to go to directory of previous question
$ pq() { d=$(basename "$PWD"); pd=$(printf "../exd*/" $((${d:2:2}-1))); cd $pd ; }If wrong solution is submitted, the expected output is shown. This also helps to better understand the question as I found it difficult to convey the intent of question clearly with words alone...
$ source ../solve -q
1) Match lines containing the string: day
2) Match lines containing the string: it
3) Match lines containing the string: do you
$ grep 'do' sample.txt
How do you do?
Just do it
No doubt you like it too
Much ado about nothing
$ source ../solve -s
---------------------------------------------
Mismatch for question 1:
Expected output is:
Good day
Today is sunny
---------------------------------------------