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We have 10 PC with some version of Ubuntu and only remote access. While doing some upgrades to custom software I did not notice that the line endings in some scripts were Windows version (CR+LF) and not the Unix version (LF). So now when I want to launch the script it gives an error:

bash: /usr/local/bin/portsee: /usr/bin/python^M: bad interpreter: No such file or directory

Is there a way to change all line endings in a script from terminal. The thing is that I can not install any new software to this group of PC-s.

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  • 1
    Use the sed command from the duplicate's accepted answer. – terdon Jul 26 '16 at 15:07
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Option 1: dos2unix

You can use the program dos2unix, which is specifically designed for this:

dos2unix file.txt

will replace all CR from all lines, in place operation.

To save the output in a different file:

dos2unix -n file.txt output.txt

You might need to install it first by:

sudo apt-get install dos2unix

Option 2: sed

Or you can use sed to replace all CR (\r) from line endings:

sed -i.bak 's/\r$//' file.txt

With option -i, the file will be edited in-place, and the original file will be backed up as file.txt.bak.

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  • 4
    I did use the sed command and it worked. Thank you! – NonStandardModel Jul 26 '16 at 15:14
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    dos2unix and unix2dos are present in cygwin as well – Obi Wan - PallavJha Jul 23 '19 at 9:00

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