$B%U%!%$%k$N%*!<%W%s$H%/%m!<%:$O!"4pK\5;=Q$N0l$D$G$9!#(B
$B%W%m%0%i%`$N30$NB8:_$G$"$k%U%!%$%k$O!" $B%f!<%6$N4uK>$9$k%U%!%$%k$r%3%^%s%I%i%$%s$+$i%W%m%0%i%`$KM?$($i$l$k$h$&$K$9$k$?$a$K!"(Bmain()$B4X?t$N0z?t$K$D$$$F$b9g$o$;$F$3$3$G3X=,$7$^$9!#(B
$B%U%!%$%k$N%*!<%W%s$K$O!"(Bfopen()$B4X?t$r;H$$$^$9!#(B
fopen()$B$O!"BP>]$H$J$k%U%!%$%kL>$H3+$-J}!J$3$3$G$OFI9~$r$7$?$$$H$$$&0U;WI=<($N$?$a$K(B"r"$B$r;XDj$7$F$$$^$9!K$r;XDj$7$F;H$$$^$9!#(B
$BI8=`F~=PNO$r;H$&$H$-$O!"$3$&$7$?:n6H$OITMW$G$7$?!#(B
$B%]%$%s%H$O(Bmain()$B4X?t$N0z?t$G$"$k(B argc $B$H(B argv $B$G$9!#(B
$BNc$($P(B
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$B>e5-$N%W%m%0%i%`$O!"$3$&$7$?I,MW:GDc8B$N$3$H$O3N$+$K=PMh$F$$$^$9$,!"$$$$=q$-J}$H$O8@$($^$;$s!#(B
$B2?2s%;%0%a%s%F!<%7%g%s%U%)!<%k%H$r7P83$7$^$7$?$+!)$=$NM}M3$,J,$+$j$^$9$+!)(B
$B1i=,(B
02-01-ex1: $BK\@a$N@bL@$KB($7$?7A$G!"4X?t7?%W%m%0%i%_%s%08@8l$NFCD'$r=R$Y$h!#(B
$B2<$N%W%m%0%i%`$O!"MM!9$J>u67$,Mh$F$bBP1~$G$-$k$h$&$K$J$C$F$$$k%W%m%0%i%`$G$9!#(B
02-02-OpenFile-Full.c
$B%f!<%6$,!"$$$D$bB8:_$9$k%U%!%$%kL>$@$1$r;XDj$7$F$/$l$k(B($B>e5-$N!V$^$H$b$KF0$/Nc!W!K$H$O8B$j$^$;$s!#(B
$B$=$N$?$a$NBP1~$r$9$k$Y$-$G$9!#(B
$B$3$3$G!"%3%s%T%e!<%?%W%m%0%i%^$NITJ8N'$H$7$F!"(B$B@0?t$NJVCM$,(B0$B!a4|BTDL$j!(J?2:L5;v(B$B$H$$$&$b$N$,$"$j$^$9!#(B
$B$^$?!"%U%!%$%k$KBP$7$FMQ$,$J$/$J$C$?$i!"B.$d$+$K(Bfclose()$B$G%U%!%$%k$rJD$8$k=,47$r$D$1$F$*$-$^$7$g$&!#(B
$B1i=,(B
02-02-ex1: $B $B$H$3$m$G!"$J$s$G(Bmain()$B4X?t$O@0?tCM$rJV$9$3$H$K$J$C$F$$$k$N$G$7$g$&$M!)(B
$BCf$K=q$$$F$"$k%3%^%s%I$r#19T$:$D<+J,$G%3%^%s%I%i%$%s$GBG$C$F$_$F$/$@$5$$!#(B
$B1i=,(B
02-03-ex1: $B%3%^%s%I%i%$%s0z?t$N?t$H$=$NFbMF$rA4$FI=<($9$k%W%m%0%i%`$r:n@.$7$J$5$$!#(B
02-03-ex2: $B%3%^%s%I%i%$%s0z?t$N#1$D$H$7$F%9%Z!<%9$r4^$`J8;zNs$rM?$($k$K$O!"%3%^%s%I%i%$%s$G$I$N$h$&$KF~NO$9$Y$-$+<($7$J$5$$!#(B
02-03-ex3: $BJQ?t(Bargv$B$N7?$r@53N$KEz$($J$5$$!#(B
02-03-ex4: $B%3%^%s%IL>(B "./example"$B!"Bh#10z?t(B "234.545"$B!"Bh#20z?t(B "input.log"$B!"$H$7$F
C$B8@8l$G$O!"%(%i!<=hM}$O(B($B;DG0$J$,$i(B)$B<+J,$G9T$&$N$,4pK\$G$9!#(B
$B!J$=$l$f$($K%(%i!<$r4:$($FL5;k$9$k$H$$$&9bEy@o=Q$r
02.01. $B%U%!%$%k$N$>$s$6$$$J3+$-J}(B
man$B$G(Bfopen$B$rD4$Y$k(B$B$H!";H$&$?$a$K$O(B"#include <stdio.h>"$B$rM=$a$7$F$*$-$J$5$$$H=q$$$F$"$k$N$G!"%=!<%9$N:G=i$N$[$&$K5-F~$7$F$*$-$^$9!#(B
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$B%*!<%W%[email protected]$9$k$HBP>]%U%!%$%k$KBP1~$7$?!VHV9f;%(B(FILE$B9=B$BN$X$N%]%$%s%?(B)$B!W$rEO$7$F$b$i$($^$9!#(B
$B!J@5<0$K$O%U%!%$%k%G%#%9%/%j%W%?$H8F$V$b$N$G$9!#(B)
$B0J8e$O$=$NHV9f;%$rMQ$$$F%G!<%?F~=PNO$r9T$$$^$9!#(B
$B;HMQ8e!"%U%!%$%k$N%/%m!<%:$K$O(Bfclose()$B4X?t$rMQ$$$^$9!#(B
$B$3$l$O%W%m%0%i%`
argc$B$+$i!"%3%^%s%I%i%$%s$+$i$N
argv[]$B$OJ8;zNs%]%$%s%?$NG[Ns$G$9!#$3$NG[Ns$O(Bargc$B8DJ,(B(0$B!A(Bargc-1)$BMQ0U$7$F$/$l$F$"$j$^$9!#(B
$B0l$D$NJ8;zNs%]%$%s%?$r;2>H$9$k$H!"$=$3$+$i(B'\0'$B$NF~$C$?%P%$%H$^$GJ8;zNs$,B3$$$F$$$k$h$&$K$J$C$F$$$^$9!#(B
$ ./02-01-OpenFile-NotSoGood
$B$H$9$k$H!"
$ ./02-01-OpenFile-NotSoGood abc.txt 2ndoption.log 2011
$B$H$9$k$H!"(B
$B!&(Bargc $B$O(B 4
$B!&(Bargv[0] $B$O(B "./02-01-OpenFile-NotSoGood" $B$H$$$&J8;zNs$,F~$C$?(B27$B%P%$%H$NNN0h$N@hF,%P%$%H%"%I%l%9(B
$B!&(Bargv[1] $B$O(B "abc.txt" $B$H$$$&J8;zNs$,F~$C$?(B8$B%P%$%H$NNN0h$N@hF,%P%$%H%"%I%l%9(B
$B!&(Bargv[2] $B$O(B "2ndoption.log" $B$H$$$&J8;zNs$,F~$C$?(B14$B%P%$%H$NNN0h$N@hF,%P%$%H%"%I%l%9(B
$B!&(Bargv[3] $B$O(B "2011" $B$H$$$&J8;zNs$,F~$C$?(B5$B%P%$%H$NNN0h$N@hF,%P%$%H%"%I%l%9!J>!
$B!J$=$l$>$l#1%P%$%HB?$$$h$&$J5$$,$9$k$N$O!"@hJ}$,J8;zNs$N:G8e$KJ8;zNs=*C<$rI=$9(B'\0'$B$r$/$C$D$1$F$/$l$F$$$k$+$i$G$9(B)
$B$I$&$^$:$$$+!"
$ gcc -Wall -o 02-01-OpenFile-NotSoGood 02-01-OpenFile-NotSoGood.c
$ emacs abc.txt ($B$J$K$+:n@.$7$F$_$^$7$g$&!#:#2s$OCf?H$O6u$G$b9=$$$^$;$s!#(B)
$ ls ($B>/$J$/$H$b(B 02-01-OpenFile-NotSoGood, 02-01-OpenFile-NotSoGood.c, abc.txt$B$O$"$k$O$:(B)
$ ./02-01-OpenFile-NotSoGood abc.txt ($B$^$H$b$KF0$/Nc(B)
$ ./02-01-OpenFile-NotSoGood ($BMn$A$^$9(B)
$ ./02-01-OpenFile-NotSoGood def.txt ($BMn$A$^$9(B)
$ chmod u-r abc.txt ($B%f!<%6<+?H$G$9$i(Babc.txt$B$rFI$a$J$$>uBV$K$9$k$H!E(B)
$ ./02-01-OpenFile-NotSoGood abc.txt (abc.txt$B$r;XDj$7$F$bMn$A$k$h$&$K$J$j$^$9(B)
$ chmod u+r abc.txt ($B%f!<%6<+?H$G(Babc.txt$B$rFI$a$k$h$&$KLa$9$H!E(B)
$ ./02-01-OpenFile-NotSoGood abc.txt ($B$^$H$b$KF0$/$h$&$KLa$C$F$-$^$7$?(B)
$B$3$l$i$N%;%0%a%s%F!<%7%g%s%U%)!<%k%H$O9T57$N$h$$%W%m%0%i%`$r=q$1$P!J@5$7$/H~$7$$(BC$B8@8l$r=q$1$P!K$9$Y$F2sHr$G$-$^$9!#(B
$B$^$?!"3'$5$s$O$3$&$7$?%/%j%F%#%+%k%(%i!<$r2sHr$9$Y$-$G$9!#(B
02.02. $B%U%!%$%k$N>eIJ$J3+$-J}(B
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$B!J%0%0$C$F$b$h$7!#$?$@$7(BWindows$BMQ$H$+$G$J$/(BUnix$BMQ$N@5$7$$%Z!<%8$rC5$5$J$$$H:.Mp$N$b$H$G$9$h!#(Bgoogle$B@h@8$OK|G=$G$O$"$j$^$;$s!#(B)
$B3'$5$s$,$3$N@h!"(BC$B8@8l$G<+J,$G4X?t$r:n@.$7$FJV$jCM$G>uBV$rJV$9$H$-$O!"@0?t7?$K$7$F@5>o=*N;$r(B0$B$K!"$=$l0J30$N0[>o=*N;;~$K$O(B0$B0J30$rJV$9$h$&$K$7$^$7$g$&!#(B
$B!J$3$l$O!VJ82=E*$J47=,!W$J$N$G!"$3$&$$$&=,47$N$J$$%W%m%0%i%^$b$?$/$5$s$$$^$9$1$I$M!#(B)
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02.03. bash$B$H$NO"7H(B
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$B!J$=$l$,LLE]$K$J$C$?$i!"(B"$ bash ./02-03-OpenFile-AndGo.bash"$B$G$^$H$a$F
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$B!J(Bbash script$BCf$G$O!"(B#$B$O%3%a%s%H$N3+;O$rI=$7$F$$$^$9(B)
$B!J(BC$B8@8l$G$O(B // $B$H$+(B /* */ $B$J$N$K!"$J$<0c$&$N$+$C$F!)(B bash$B$r:G=i$K3+H/$7$??M$?$A$N
$B!&3F0z?t$O#19T$:$D2~9T$7$FI=<($9$k$3$H!#(B
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kameda[at]iit.tsukuba.ac.jp