lecture15_inf201_fall2010

lecture15_inf201_fall2010 - IINF201 (Fall 2010) Intro. to...

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IINF201 (Fall 2010) Intro. to Info. Technologies Department of Informatics University at Albany – SUNY Lecture From: Sairam Chinnam, INF 523 Fall 2006 Original Source: Afzal, Amir, (2002), UNIX Unbounded: A Beginning Approach, 4th Edition, Prentice Hall.
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Linking Files and “Pipes” two names for a single file – % ln myfile myfile_link – %ls –li • Pipe operator – allows the standard output of one process as the standard input of another process. - % ls –c | wc -w
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File Permissions Three levels of permissions: – read, write, execute Three kinds of users: – user/owner, group, others Actions to be taken: – grant/deny permission Permissions can also be applied to directories
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Example drwx------ 2 richard staff 2048 Jan 2 1997 private drwxrws--- 2 richard staff 2048 Jan 2 1997 admin -rw-rw---- 2 richard staff 12040 Aug 20 1996 admin/userinfo drwxr-xr-x 3 richard user 2048 May 13 09:27 public
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Meaning-position positionMeaning 1 directory flag, 'd' if a directory, '-' if a normal file,
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lecture15_inf201_fall2010 - IINF201 (Fall 2010) Intro. to...

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