Red Hat ENTERPRISE LINUX WS 2.1 - Guia de Instalação descarregar pdf (Página 220)

• each user can set his own umask, e.g in his .profile or .bashrc

. For this

it is necessary to add a line like this:

umask 0002

The 4-digit number must start with zero. The following three digits describe the

permissions for the user, group and others.

examples

1. create a file fila, e.g. with vi, for different values of umask

2. show the output of ls -l fila

• umask 000 → permissions 666

-rw-rw-rw- 1 owner group 10 Jun 7 12:20 fila

• umask 002 → permissions 664

-rw-rw-r-- 1 owner group 10 Jun 7 12:20 fila

• umask 024 → permissions 642

-rw-r---w- 1 owner group 10 Jun 7 12:20 fila

• umask 666 → permissions 000

----------- 1 owner group 10 Jun 7 12:20 fila

13.3 Linux shells

A Linux shell:

• is a layer between the operating system and the user.

1. umask can be set for all users in the file /etc/profile and /etc/csh.login (sh and

bash) or /etc/csh.cshrc (csh and tcsh)

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Red Hat ENTERPRISE LINUX WS 2.1 - Guia de Instalação Página 220