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changing all characters of a file to capital letters

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# 1  
Old 09-29-2011
changing all characters of a file to capital letters
Hi guys.

I have file named output.txt containing file names. one per line. I use this command to convert all characters to capital letters and write to the same file.
Code:
cat output.txt | tr 'a-z' 'A-Z' > output.txt

But at the end output.txt is emtpy. Could anyone help??
# 2  
Old 09-29-2011
Code:
tr a-z A-Z < output.txt > _out &&
  mv -- _out output.txt

This User Gave Thanks to radoulov For This Post:
majid.merkava
# 3  
Old 09-29-2011
Quote:
Originally Posted by radoulov
Code:
tr a-z A-Z < output.txt > _out &&
  mv -- _out output.txt

I Know the solution. I want to know why this occurs? Smilie
# 4  
Old 09-29-2011
Move o/p to temp file and mv it ..
Code:
$ tr -s '[:lower:]' '[:upper:]' < infile > dummy_file ; mv dummy_file infile

# 5  
Old 09-29-2011
Quote:
Originally Posted by majid.merkava
I Know the solution. I want to know why this occurs? Smilie
It happens because the redirection is performed before the rest of the operations Smilie
This User Gave Thanks to radoulov For This Post:
majid.merkava
# 6  
Old 09-29-2011
Code:
perl -lane 'print uc($_)' inputfile > outputfile

# 7  
Old 09-29-2011
Quote:
Originally Posted by itkamaraj
Code:
perl -lane 'print uc($_)' inputfile > outputfile

Or:

Code:
perl -i -pe'$_ = uc' inputfile

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