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

possible with -i option of sed
its GNU version of sed

please search the forum; it had been answered many times

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