问题
I have a question about removing invisible characters which can be only be seen when we try to view the file using "vi" command. We have a file that's being generated by Datastage Application (Source is a DB2 Table -> Target is a .txt File). File has data with different data types. I'm having an issue with just 3 columns which have their datatypes defined as CHAR.
If you open the the file in a Textpad you'd see spaces. But when you view the same file on Unix via vi command, we see ^@ characters in blue color. My file is a delimiter file with the delimiter as ^@^ (I know it's kinda sounds weird) .
I have tried:
tr -d [:cntrl:] <Filename >NewFileName— Still no luck — [Delimiters are removed but the spaces remain]tr -s "^@" <Filename >NewFilename— Still no luck — I see file reduce in file size but the invisible characters still stay.- Tried changing the delimiter — but still see the same invisible characters.
- Used
sed "s/^@/g/"(and other sed commands)<Filename— still no luck.
Any suggestions are really appreciated. I have researched the posts on this website but I couldn't find one. If it's a simple please excuse me and share your thoughts.
回答1:
In vi, NUL characters are represented as ^@. To get rid of them:
tr
Using tr, you should be able to remove the NUL characters as follows:
tr -d '\000' < file-name > new-file-name
回答2:
open the file with vim and then type ':' without the single quote and paste this:
%s/control + 2//g (on regular PCs)
%s/control + shift + 2 //g (on Mac PCs)
of course, replace with keys from your keyboard
来源：https://stackoverflow.com/questions/31846045/remove-characters-in-a-unix-file