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How to remove part of the line from start of the line?

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# 8  
Old 05-23-2017
Hello chetanojha,

Could you please try following to remove control M characters and let me know if this helps you.
Code:
tr -d '\r' < Input_file
OR
awk '{gsub(/\r/,"");print}' Input_file

Thanks,
R. Singh
# 9  
Old 05-23-2017
Hi Ravinder,

Both worked well on command line. But i am trying to write the content back to file where I do not see any chances.

I am trying below.

Code:
 awk '{gsub(/\r/,"");print}' Input_file  >>  Input_file

Quote:
Originally Posted by RavinderSingh13
Hello chetanojha,

Could you please try following to remove control M characters and let me know if this helps you.
Code:
tr -d '\r' < Input_file
OR
awk '{gsub(/\r/,"");print}' Input_file

Thanks,
R. Singh
# 10  
Old 05-23-2017
Quote:
Originally Posted by chetanojha
Hi Ravinder,
Both worked well on command line. But i am trying to write the content back to file where I do not see any chances.
I am trying below.
Code:
 awk '{gsub(/\r/,"");print}' Input_file  >>  Input_file

Hello chetanojha,

Command you ran is again putting the output into same Input_file, note that awk doesn't have that facility in it, you could further try following on same then.
Code:
awk '{gsub(/\r/,"");print}' Input_file > temp_file && mv temp_file Input_file

So above will take output to a temp_file and then it will rename it to Input_file, let me know if this helps you.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
chetanojha
# 11  
Old 05-24-2017
Actually, you can do this in awk without a temporary file because this is a special case:
Code:
awk '{sub(/\r/,""); print $NF > FILENAME; exit}' Input_file

The special case works only when awk has already read everything it needs from your input file before it attempts to write anything back to your input file and quits before trying to read anything else.
This User Gave Thanks to Don Cragun For This Post:
chetanojha
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