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how to alter the old file permanently using sed?

 
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# 1  
Old 04-06-2006
Question how to alter the old file permanently using sed?
hi ,
m new to sed and awk. can anyone tell me how to alter the old file permanenetly using sed.
e.g.
$sed 's/cat/dog/g' old_file
the above command will replace all the occrance of cat by dog in the file called old_file and by default will show the output at stdout.
so is there anyway of altering the same "old_file" with sed.
plz reply soon,
bye
# 2  
Old 04-06-2006
possible with -i option of sed
its GNU version of sed

please search the forum; it had been answered many times
# 3  
Old 04-06-2006
MySQL thanks
thnks buddy,
ya its working.can u also tel me how to remove the header from that same file
i.e.
i did
$ sed -i 's/cat/dog/g' old_file
the above is replacing cat to dog from the file called old_file,can i also remove the 1st line from the same file (old_file) simultaneously?
thanks in advance
 
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