How to delete a line of the text file from the output of checklist-CodePudding

I have a text file:

$100 Birthday
$500 Laptop
$50 Phone

I created a --checklist from the text file

[ ] $100 Birthday
[*] $500 Laptop
[*] $50 Phone

the output is $100 $50

How can I delete the line of $100 and $50 in the text file, please?

The expected output of text file:

$100 Birthday

Thank you!

CodePudding user response：

with grep and cut

grep -xf <(grep '\[ ]' file2.txt | cut -d\  -f3-) file1.txt

with grep and sed

grep -xf <(sed -rn 's/\[ ]\s (.*)/\1/p' file2.txt) file1.txt

explanation

use grep to select lines from text file

$ grep Birthday file1.txt
100 Birthday

cut will split line into columns. -f 2 will print only 2nd column but -f 2- will print everything from 2nd column. as delimiter -d whitespace \ is used here (some character must escaped with \)
we can use pipe | as input instead file

$ echo one two three | cut -d \  -f 2-
two three
$ grep Birthday file1.txt | cut -d \  -f 2-
Birthday

assuming we have a text file temp.txt

$ cat temp.txt
Birthday
Laptop
Phone

grep can also read list of search patterns from another file as input instead

$ grep -f temp.txt file1.txt
100 Birthday
500 Laptop
50 Phone

or we print the file content with cat and redirect output with <

$ grep -f <(cat temp.txt) file1.txt
100 Birthday
500 Laptop
50 Phone

Now let's generate temp.txt from checklist. You only want grep lines containing [ ] and cut starting from 3rd column (again some characters have special meaning and must therefore escaped \[)

$ grep '\[ ]' file2.txt
[ ] 100 Birthday
$ grep '\[ ]' file2.txt | cut -d\ -f3-
100 Birthday

You don't need temp.txt and can therefore redirect list straight to grep -f what is called process substitution <(...)

$ grep -f <(grep '\[ ]' file2.txt | cut -d\  -f3-) file1.txt
100 Birthday

grep read all lines from temp.txt as PATTERN and some characters have special meaning for regex. ^ stands for begin of line and $ for end of line. To be nitpicky correct search pattern should therefore be '^100 Birthday$' so it won't match "1100 Birthday 2".
You might have noticed that I dropped the $ currency in your input files for reason. You can keep it, but tell grep to take all input literally with -F and(/or?) -x flag which will search for whole line "100 Birthday" (no regex for line start/ending needed)

(... to be continued)