The permissions you see when you ls -l a file are derived from a 4 digit octal number. Ignoring the first digit for the moment (setuid,setgid and the sicky bit) we have 3 octal digits these digits represent the rights of, in order, owner, group and world to the resource. since 8 is the 3rd power of 2 we can represent 3 states with each octal digit (since 4+2+1=7) depending on which values are set (this is a bitmask ie based on powers of 2, handy to manipulate with bitwise operations)
The umask defines the permissions that are NOT available to each user group.
thus a umask of 027 means that owner has all rights, group has read and execute rights and everyone else has no rights.
Last edited by Scrutinizer; 06-01-2012 at 09:55 AM..
hi guys im running into a problem here im trying to calculate a sum a values from a field for example a hava a file caled <filename> and it has $3 fields, and i want toextract a group of values from field &1 and compute the sum of values from $3 accordingly this is my code so far...
awk... (3 Replies)
Hi, I am having the file which contains the following two columns.
518 _factorial
256 _main
73 _atol
52 ___do_global_ctors
170 ___main
52 ___do_g
How can calculate the percentage of each value in the first column ?
first need to get the sum of the first column and... (3 Replies)
Please advice me how to calculate logical layout values in hdd from below table.
Physical Layout
-----------------
Bytes per Sector : 512
Sectors per Track : 480-1272
Number of Heads : 4
Number of Disks : 2
Logical Layout
---------------
Number of Heads : 16
Number of Sectors /... (9 Replies)
Hi,
I have a file containing timestamps (at micro-seconds granularity). It looks like the following:
06:49:42.383818
06:49:42.390190
06:49:42.392308
06:49:42.392712
06:49:42.393437
06:49:42.393960
06:49:42.402115
Now I need a sed/awk script to take the difference of two successive... (2 Replies)
Hello,
I'm trying to create a shell script (#!/bin/sh) which should tell me the age of a file in minutes...
I have a process, which delivers me all 15 minutes a new file and I want to have a monitoring script, which sends me an email, if the present file is older than 20 minutes.
To do... (10 Replies)
Hello Expert,
I need to transpose Date-Timestamp based on same column values and calculate time difference. The input file would be as below and required output is mentioned in the bottom
INPUT File
========
08/23/2012 12:36:09 JOB_5340
08/23/2012 12:36:14 JOB_5340
08/23/2012... (2 Replies)
Hey guys,
I have several huge tab delimited files which look like this:
a 1 20
a 3 15
a 5 10
b 2 15
b 6 10
c 3 23
what I am interested is to calculate the average of top n% of data in third column. So for example for this file the top 50% values are:
23
20
(Please note that it... (11 Replies)
hi all i have a reporting work and i want it to be automated using shell scripting kindly let me know how can i make that possibe .
eg data are :... (2 Replies)
Trying to use file1 which is the actual counts in $2 associated with each $1 entry. The total of each $1 is in file2 with the total in $3. So when there is a match between $1 in file1 with $1 in file2, then the % is calculated using the $2 value of file1 and $3 value of file2. Thank you :).
... (4 Replies)
Hello,
I am writing a script which expects as its input a hash with student names as the keys and marks as the values. The script then returns array of average marks for student scored 60-70, 70-80, and over 90.
Output expected
50-70 1
70-90 3
over 90 0
The test script so far... (4 Replies)
Discussion started by: nans
4 Replies
LEARN ABOUT SUNOS
umask
umask(2) System Calls umask(2)NAME
umask - set and get file creation mask
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
mode_t umask(mode_t cmask);
DESCRIPTION
The umask() function sets the process's file mode creation mask to cmask and returns the previous value of the mask. Only the access per-
mission bits of cmask and the file mode creation mask are used. The mask is inherited by child processes. See intro(2) for more information
on masks.
RETURN VALUES
The previous value of the file mode creation mask is returned.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO mkdir(1), sh(1), intro(2), chmod(2), creat(2), mknod(2), open(2), stat.h(3HEAD), attributes(5), standards(5)SunOS 5.10 28 Dec 1996 umask(2)