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-General UNIX discussion FAQ
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Shell Scripts
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How do I eliminate ^M
Posted: 11 May 02
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If you need to eliminate control-M, ^M, and your unix version doesn't posses a dos2unix style command, within vi, as suggested by pcunix:
1,$s/^V^M//g
(you type Control V and then Control M- only the control M will show up)
If you decide to write a script, try one of these suggestions:
1) The following replacement sed command works by deleting the last character of each line:
sed 's/.$//' $i.tmp > $i
Be careful! The above sed command clobbers the last character in the line, whether it's a control character or not.
2) A better solution is replacing the last character if the octal value is 15 or 32, Control-m and Control-z respectively:
sed 's/'"$(printf '\015')"'$//
s/'"$(printf '\032')"'$//' $i.tmp > $i
3) Perhaps the best solution is executing the tr command to delete all octal 15 and 32 characters. Replace the sed command with the following:
tr -d '\015\032' < $i.tmp > $i
The above command deletes all ^M and ^Z -- not just the ones at the end of the line.
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