variables use upper case? sed : output to the same file?

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# 1  
Old 04-04-2002
Question variables use upper case? sed : output to the same file?


Q1: are the variables in shell script usually UPPER CASE?

Q2: can sed output to the same file that it's using it?

eg. cat sameFile | sed 's/here/there/g' > sameFile ?

I expect the sed replace all "here" to "there" and change it in sameFile.

i tried that one, the sameFile is empty after the command, why?


# 2  
Old 04-05-2002
A1 : not necessarily, you can also use small letters in the variables.

A2 : it is not possible to use the file of input as file of output.
Unhappyly you will have that to generate a separate file for output and if to desire, rename it with the name of the file of

e.g.: sed -e s/here/there/g input.file > output.file;mv output.file input.file

I hope help you
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