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06-24-2008
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overwriting a line in text file
I have a text file with following content (3 lines)
filename : output.txt first line:12/12/2008 second line:12/12/2008 third line:Y I would like to know how we can replace 'Y' with 'N' in the 3rd line keeping 1st and 2nd lines same as what it was before. I tried using cat output.txt |sed -e 's/third line:Y/third line:Y/' , but in this case it writes the output to some other file and we have to replace that old file with new file. Do we have a way to do this without replacing the old file with new file after using sed command or can we do this any command other than sed? Last edited by santosham; 06-24-2008 at 11:16 AM.. |
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06-25-2008
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your sed does not support the inline edit -i option.
using Perl: Code:
perl -pi -e 's/third line:Y/third line:N/' output.txt |
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06-25-2008
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Regarding only changing the third line:
$ cat f yy yy yy yy yy $ sed '3s/yy/nn/' f yy yy nn yy yy Does this help? Last edited by eBay; 06-25-2008 at 06:35 PM.. |
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