newlinesspecial charactersterminalvim
Many webpages said that ASCII code for enter key is 13(0d).
Enter key is considered as Carriage Return (CR).
Now let's make an experiment.
To open vim and just click enter key for three times ,do nothing more,then save the file as test.csv.
xxd test.csv
0000000: 0a0a 0a
My conclusions got.
The enter key's ascii value is 0a ,meaning newline ,it is different from Carriage Return (13 or 0d in ascii).
Is right or not?
Carriage return puts the cursor back to the beginning of the line. Your output string is:
This is yesterday date:20130605<Cr>end
Except, when the terminal hits the <Cr> it returns the cursor to the beginning of the line and overwrites the characters that are there.
In other words, "Thi" gets replaced with "end", producing:
ends is yesterday date:20130605
To do what you appear to be trying to do your script should look something like this:
variable="text"
echo "Some sentence $variable"
Which will output
Some sentence text
IF there are stray carriage returns they should show up as ^M in vi (as Bruce said)
Solution 1
The best way to remove carriage returns or other non-printing characters is with the tr command with the -d option, which deletes any instance of a single character, with \r which is the escape sequence for carriage return:
tr -d '\r'
This will remove all carriage returns. Run it on the script to remove all instances of carriage returns, then overwrite the original script file:
tr -d '\r' yourscript.bash > temp
mv temp yourscript.bash
Solution 2
or while in vi with the script open enter:
:%s/\r//g
:wq
To remove the carriage returns within the document then save it.
I am not sure but here for you to try.
PuTTY may add one more "CR" when it see "LF", that the cause of double "CR" chars.
Look your configuration at "PuTTY\Terminal\Implicit CR in every LF"
Best Answer
Your terminal sends carriage return when you press Enter, and on Unix-like systems, the terminal driver translates that into line-feed ("newline").
That's the
icrnlfeature shown bystty -a, e.g.,Programs (even shell scripts) can turn that off to read the actual carriage return character to distinguish it from ControlJ (line feed).