This shows us that you did not run the sed command you showed us because the file output.txt does not exist. Furthermore, despite what you said was in input.txt in post #9, we now know that there are only two lines in input.txt and both of them contain decimal digits ("8" and "9" in the 1st line and "8" three times in the 2nd line). What the other 17,397,783 bytes are in that file is a mystery, but are apparently non-printable characters (quite possibly control characters such as null bytes). So, we would expect that if you had run the sed command:
the file output.txt would exist but would be empty. But, since sed is only defined to work on text files and it doesn't appear that input.txt is a text file; all bets are off.
Sorry, yes I kind deleted the output.txt.
This is the out come after apply this sed commad to input.txt.
sed '/[[:digit:]]/d' input.txt > output.txt
The result of output.txt is still nothing inside.
The output.txt is blank as usual and nothing is inside.
If the characters are non-printable, what are the options I have to fix this? In the input.txt, there's only A-Z and 0 8 9 characters, no any other special characters.
I'm using Mac Os X Yosemite Ver 10.10.2 (14C109) btw
I am trying to delete all empty lines from a file using either
grep -v ^$ file
or
sed '/^$/d' file
But neither one is working.
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