tr and sed remove spaces. how to stop this?

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02-10-2011

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tr and sed remove spaces. how to stop this?

if the answer is obvious, sorry, I'm new here.

anyway, I'm using tr to encrypt with rot-13:

Code:

echo `cat $script | tr 'a-zA-Z' 'n-za-mN-ZA-M'` > $script

it works, but it removes any consecutive spaces so that there is just one space between words. I've had this problem before while using sed to delete lines of text in a file (it worked but removed consecutive spaces).

how to fix it?

Last edited by Franklin52; 02-10-2011 at 08:05 AM.. Reason: Please use code tags

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The problem is the "echo" which is losing end-of line characters and multiple spaces. It is possible to fix the echo with double quotes but you will still lose end-of-line characters.
Also I'd avoid writing back to the input file.

Code:

cp -p ${script} ${script}.sav
cat ${script}.sav | tr 'a-zA-Z' 'n-za-mN-ZA-M' > ${script}
# Uncomment when tested
# rm ${script}.sav

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thanks, it works. how would I fix the same problem in sed though?

Code:

sed '/text/,/newtext/ d' filename > filename

ends up deleting everything in the file.

Code:

echo `sed '/text/,/newtext/ d' filename < filename` > filename

works but deletes the spaces again. What's the mistake I've made this time?

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02-10-2011

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Quote:

Originally Posted by Trichopterus

thanks, it works. how would I fix the same problem in sed though?

Code:

sed '/text/,/newtext/ d' filename > filename

ends up deleting everything in the file.

Code:

echo `sed '/text/,/newtext/ d' filename < filename` > filename

works but deletes the spaces again. What's the mistake I've made this time?

Code:

{ rm filename  ; sed '/text/,/newtext/ d'  > filename  ; } < filename

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The "echo" issue is the same as in you previous problem.
Unless you have the sed version with the "-i" switch it is inadvisible to write back to the same file.

Code:

cp -p filename filename.sav
sed '/text/,/newtext/ d' filename.sav > filename
# Uncomment when tested
# rm filename.sav

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Code:

 $ ruby -ne 'print $_.tr! "A-Za-z", "N-ZA-Mn-za-m"' file

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