-1- csh cd. cd alias!! ; set prompt=" pwd % " 16 cd. 17 cd.. 18 his /home% set prompt. alias. yasuoka : root :

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1 -1- csh 4 root root prompt set prompt pwd % prompt alias alias pwd % alias cd \!\! ; set prompt=" pwd % " pwd % cd. cd.. his 9 set prompt= pwd % 10 cd 11 set prompt=" pwd % " 12 cd.. 13 set prompt= pwd % 14 cd 15 alias cd 16 cd. 17 cd.. 18 his cd alias cd set prompt alias cd!! cd bin cd alias cd bin!! cd bin ; set prompt=" pwd % " C 4 3 alias 3 pushd popd 1 chdir cd chdir alias alias chdir

2 - csh cd alias alias chdir alias chdir alias cd ; set prompt=" pwd % " chdir /mnt set: Syntax error. 21 chdir /mnt 22 pwd 23 alias chdir 24 history chdir alias cd ; set prompt=" pwd % " alias! \ alias chdir \!\! ; set prompt=" pwd % " pwd /home alias chdir alias cd ; set prompt=" pwd % " chdir alias cd! \ alias chdir!! alias cd history 15 alias cd 16 cd. 17 cd.. 18 his 19 alias cd 20 alias chdir alias cd ; set prompt=" pwd % " chdir.. /% pushd popd alias /%!a:s/chdir/pushd/ alias pushd /% alias pushd /% pushd ~ ~ /!-3:s/pushd/popd/ alias popd popd / /% alias cd

3 - csh popd + popd pushd + chdir his history popd pushd rm rm -i whoami echo You are YASUOKA. /% popd alias popd popd ; set prompt=" pwd % " popd 1 pushd 1 pushd pushd 1 popd /% pushd home /home / pushd yasuoka ~ /home / / popd +2 ~ /home / popd /home popd popd: Directory stack empty. pushd pushd /mnt /mnt /home /mnt% /mnt /home /mnt% pushd /home /mnt pushd /mnt /home /mnt% popd pushd

4 - csh root root alias.cshrc cat.cshrc set path=(~/bin /usr/local/bin /usr/ucb /bin /usr/bin.) set prompt= % set history=10 stty erase ^H stty kill ^U stty intr ^C stty quit ^\\ stty eof ^D alias rm rm -i alias his history alias whoami echo You are YASUOKA. alias cd \!\! ; set prompt=" pwd % " alias chdir \!\! ; set prompt=" pwd % " alias pushd \!\! ; set prompt=" pwd % " alias popd \!\! ; set prompt=" pwd % " 2 set prompt= % set prompt=" pwd % " alias.cshrc umask umask umask 3 8 ls Mail News bin umask 000 tmp umask 000 mkdir tmp ls -ld tmp drwxrwxrwx 2 yasuoka 512 Mar 8 17:12 tmp 777 rmdir tmp umask 027 mkdir umask 027 mkdir tmp!l ls -ld tmp drwxr-x--- 2 yasuoka 512 Mar 8 17:13 tmp rmdir tmp 750 umask 777 umask 027 touch tmp ls -l tmp -rw-r yasuoka 0 Mar 8 17:13 tmp 640 umask 000 rm tmp rm: remove tmp? y umask 000 touch tmp!l

5 - csh ls -l tmp -rw-rw-rw- 1 yasuoka 0 Mar 8 17:14 tmp rm tmp rm: remove tmp? y 666 executable ginkaku umask 022 umask 000 chmod writable.cshrc umask umask umask 022 alias pushd \!\! ; set prompt=" pwd % " alias popd \!\! ; set prompt=" pwd % " source.cshrc executable umask chmod writable readable ls executable cd executable ls cat cat.cshrc umask 022 set path=(~/bin /usr/local/bin /usr/ucb /bin /usr/bin.) set prompt=" pwd % " set history=10 stty erase ^H stty kill ^U stty intr ^C stty quit ^\\ stty eof ^D alias rm rm -i alias his history alias whoami echo You are YASUOKA. alias cd \!\! ; set prompt=" pwd % " alias chdir \!\! ; set prompt=" pwd % " chmod 444 bin ls -ld bin dr--r--r-- 2 yasuoka 512 Mar 7 18:24 bin ls bin bow dow hb~ users~ where~ who~ bow~ hb users where who cat bin/bow bin/bow: Permission denied chmod 755 bin csh