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Linux $@$H(J FreeBSD $@$NN>J}$K>\$7$$?M$K<ALd(J.

Linux $@MQ$K$+$+$l$?%7%'%k%9%/%j%W%H$r(JFreeBSD$@$GF0$+$=$&$H$7$F(J
$@<!$NHs8_49@-$,$"$j$^$7$?!#(J

LINUX $@$N>l9g(J -a $@$O(J [ $@$N4{$KB8:_$9$k$+$I$&$+$rH=Dj$9$k%U%i%0$i$7$$$G$9(J.
	if [ -a file_name ]; then
FreeBSD $@$N>l9g!"BP1~$9$k$N$O(J
	if [ -e file_name ]; then
$@$G$9$M(J.
$@=q$-D>$9$@$1$G!"0l1~2r7h$7$^$7$?(J.

FreeBSD $@$N>l9g(J, [ -a  $@$O!"B8:_$7$J$$$h$&$G$9$M(J. 
$@B?J,Nr;KE*$J;v>p$,$"$k$N$G$7$g$&$,(J.

$@$O$?$7$F(J linux $@8_49%b!<%I$@$H!"(J [ -a $@$r%5%]!<%H(J
$@$9$k$h$&$K(J [ $@$NF0:n$r<+F0E*$K@Z$jBX$($k$Y$-(J
$@$J$s$G$7$g$&$+!)(J
