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09-06-2006
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unix file size becomes zero
Hi,
when can a unix library file size become zero? For example.: can mistyping this command -> /usr/ucb/ps -auxww|grep -i <process name> make the "ps" library file size to become zero or its contents to get deleted? Is there any other way that an inadvertant mistake could cause the file size to become zero? 
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10-01-2006
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I don't see how that command could have wiped the ps binary as there is no redirection to a file, only a pipeline into another command. A useful trick in ksh is to set the noclobber option which prevents accidental overwrite of existing files -- even for root.
# set -o noclobber # /usr/ucb/ps -auxww 3589 > out # /usr/ucb/ps -auxww 3589 > out ksh: out: file already exists Use the >| syntax for force an overwrite: # /usr/ucb/ps -auxww 3589 >| out
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