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02-25-2003
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SED Command Returning a Blank File
I have a file called get_columns.sh that I would like to replace $2 with $3. I have the following sed command written that works
sed s/'$3'/'$2'/g get_columns.sh > output.txt However, when I try the command below, the file is empty. sed s/'$3'/'$2'/g get_columns.sh > get_columns.sh Thanks for your assistance. Dave |
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02-25-2003
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You can't use the same file for input and output. The shell is destroying your input file by preparing to to write into it. This is done before the sed command even gets a chance to run.
Send the output to a tmpfile or something, then mv tmpfile get_columns.sh |
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