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Lecture 6: File Systems ( ch 4)

Lecture 6: File Systems ( ch 4). IT244 - Introduction to Linux / Unix Instructor: Bo Sheng. Access Permissions. Execute permission on files Binary and script cp /home/shengbo/it244/binary . cp /home/shengbo/it244/script . ls – l (check the execute permission) cat binary cat script.

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Lecture 6: File Systems ( ch 4)

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  1. Lecture 6: File Systems (ch 4) IT244 - Introduction to Linux / Unix Instructor: Bo Sheng

  2. Access Permissions • Execute permission on files • Binary and script • cp /home/shengbo/it244/binary . • cp /home/shengbo/it244/script . • ls –l(check the execute permission) • cat binary • cat script

  3. Access Permissions • Execute permission on files • Binary and script • chmod a=x binary • ./binary

  4. Access Permissions • Execute permission on files • Binary and script • chmod a=x script • ./script • chmod a=rx script

  5. Access Permissions • Execute permission on files • Binary ( x ) • Script ( rx )

  6. Access Control List • ACL: fine-grained access control • getfacl and setfacl • getfacl hello • setfacl –mu:shengbo:rw- hello • getfacl hello • setfacl –m u:shengbo:4 hello • getfacl hello

  7. Access Control List • ACL: fine-grained access control • getfacl and setfacl • setfacl –m u:shengbo:rw-,u:yingmao:6 hello • getfacl hello • setfacl –x u:yingmao hello • getfacl hello

  8. Links • Pointer to a file or directory

  9. Links • Example • ls –l ~ • cd it244 • pwd

  10. Links • Example • ls –l ~ / home courses username it244 it244 username

  11. Links • Hard links and symbolic links • Hard links point to the actual data

  12. Links • Hard links and symbolic links • Hard links point to the actual data • ln hello hello1 • ls -l • ls –i hello hello1 (inode number)

  13. Links • Hard links and symbolic links • Hard links point to the actual data • cat hello hello1 • rm hello • cat hello1 • lnVS.cp • Hard links cannot point to directories

  14. Links • Hard links and symbolic links • Symbolic (soft) links are shortcuts Hard link Symbolic link

  15. Links • Hard links and symbolic links • Symbolic (soft) links are shortcuts • ln –s hello hello2 • ls -l • ls –i hello hello1 hello2

  16. Links • Hard links and symbolic links • Symbolic (soft) links are shortcuts • cat hello hello1 hello2 • rm hello • cat hello1 • cat hello2 • echo hi > hello • cat hello hello1 hello2

  17. Links • Hard links and symbolic links • Remove links • rm hello1

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