HPUX - File Permissions and Access

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access type

Owner, Group, Other

-rwxrwx---   1 user11     class          141 Nov 13  1993 prog1

-rw-rw----   1 user11     class           29 Nov 13  1993 yourfile

/ow//gr//ot/    owner      group   ...   and other

Files

Read : Contents can be examined [cat filename]

Write : Contents can be changed [vi filename]

Execute : File can be used as a command 

{ eg)

      $ cat myprog

# this is the program myprog

date

ls -F

$ myprog

Tue Jun 20 12:51:41 KST 2017

README.exrc      color5*          grape            memo.bak/        mytrap2*         prog2*

abcdefXlmnop     color6*          herfile          mod1.c           names            remind

abcdefYlmnop     f1               infinite*        mod2.c           names.cp         root_file

      ....

 }

Directory

Read : Contents can be examined [ ls /root, /root unreadable (for general user)]

Write : Contents can be changed [ mkdir /root/"filename", /root: Permission denied. rm /root/"filename", /root: Permission denied. mv /root/"filename" ... ]

Execute : Can become current working directory [ cd /root, /root : Permission denied ]

chomod (u,g,o,a)(+,-,=)(w,r,x) or (octal) "filename"

{

$ ll peach

-rw-rw----   1 user11     class           16 Nov 13  1993 peach

$ chmod u+x,g-w,o=r peach

$ ll peach

-rwxr--r--   1 user11     class           16 Nov 13  1993 peach

$ chmod 333 peach

$ ll peach

--wx-wx-wx   1 user11     class           16 Nov 13  1993 peach

}

umask : inform initial permission condition [umask "octal number", subtract "octal number" from initial permission condition(set initial permission condition)]

{

$ umask

02

$ mkdir adir

$ touch afile

$ ls -ld adir

drwxrwxr-x   2 user11     class           96 Jun 20 13:04 adir

[directory permission condition 777(All Unix) subtract umask 02 = 775, rwxrwxr-x]

$ ll afile

-rw-rw-r--   1 user11     class            0 Jun 20 13:05 afile

[file permssion condition 666(All Unix) subtract umask 02 = 664, rw-rw-r--]

$ umask 022

$ umask

022

$ mkdir bdir

$ touch bfile

$ ls -ld bdir

drwxr-xr-x   2 user11     class           96 Jun 20 13:10 bdir

$ ll bfile

-rw-r--r--   1 user11     class            0 Jun 20 13:10 bfile

}

touch : create a new, empty file or modification times of file

{

$ touch yohanfile

$ ls -l yohanfile

-rw-rw-r--   1 user11     class            0 Jun 20 14:29 yohanfile

$ ll lime

-rw-rw----   1 user11     class           15 Nov 13  1993 lime

$ touch lime

$ ll lime

-rw-rw----   1 user11     class           15 Jun 20 14:29 lime

$ touch -m 06201200 lime

$ ll lime

-rw-rw----   1 user11     class           15 Jun 20 12:00 lime

}

chown "username" "filename" : change owner of file [ chown "username":"groupname" "filename" change owner and group of file]

chgrp "groupname" "filename" : change group of file

su "id" : switch User id [su root, su - "username", 로그인할 때 상대 Home directory의 .profile 참조]

newgrp : changes the group ID

{

$ id

uid=311(user11) gid=301(class) groups=302(class2)

$ newgrp class2

$ id

uid=311(user11) gid=302(class2) groups=301(class)

$ newgrp class

$ id

uid=311(user11) gid=301(class) groups=302(class2)

$ touch testfile

$ ll testfile

-rw-rw-r--   1 user11     class            0 Jun 20 14:48 testfile

$ newgrp class2

$ touch dfile

$ ll dfile

-rw-rw-r--   1 user11     class2           0 Jun 20 14:49 dfile

}

review (modification)

-rw-rw----   1 user11     class         3081 Jun 20 15:19 funfile

   chmod /  ln / chown / chgrp    / vi(size) / touch       / mv 

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