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$ chmod g+rx-w letters/thankyou
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Just as with files, you can also use octal digits to set a directory permission. To set the same permissions as in the previous example, you would use the octal digits 750, which have the binary equivalents of 111 101 000.
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$ chmod 750 letters/thankyou
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As you know, the ls command with the -l option will list all files in a directory. To list only the information about the directory itself, add a d modifier. In the next example, ls -ld displays information about the thankyou directory. Notice the first character in the permissions list is d, indicating it is a directory.
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$ ls -ld thankyou drwxr-x--- 2 chris 512 Feb 10 04:30 thankyou
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If you have files you want other users to have access to, you not only need to set permissions for that file, you also must make sure the permissions are set for the directory in which the file is located. Another user, in order to access your file, must first access the file's directory. The same applies to parents of directories. Although a directory may give permission to others to access it, if its parent directory denies access, the directory cannot be reached. In this respect, you must pay close attention to your directory tree. To provide access to a directory, all other directories above it in the directory tree must also be accessible to other users.
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Changing a File's Owner or Group: chown and chgrp
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Although other users may be able to access a file, only the owner can change its permissions. If, however, you want to give some other user control over one of your file's permissions, you can change the owner of the file from yourself to the other user. The chown command
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transfers control over a file to another user. This command takes as its first argument the name of the other user. Following the user name, you can list the files you are giving up. In the next example, the user gives control of the mydata file to Robert:
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$ chown robert mydata $ ls -l mydata -rw-r--r-- 1 robert weather 207 Feb 20 11:55 mydata
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You can also, if you wish, change the group for a file, using the chgrp command. chgrp takes as its first argument the name of the new group for a file or files. Following the new group name, you list the files you want changed to that group. In the next example, the user changes the group name for today and weekend to the forecast group. The ls -l command then reflects the group change.
$ chgrp forecast today weekend $ ls -l -rw-r--r-- 1 chris weather 207 Feb 20 11:55 mydata -rw-rw-r-- 1 chris forecast 568 Feb 14 10:30 today -rw-rw-r-- 1 chris forecast 308 Feb 17 12:40 weekend
You can combine the chgrp operation in the chown command by attaching a group to the new owner with a colon.
13: Shell Configuration
Overview
Four different major shells are commonly used on Linux systems: the Bourne Again shell (BASH), the Public Domain Korn shell (PDKSH), the TCSH shell, and the Z shell. The BASH shell is an advanced version of the Bourne shell, which includes most of the advanced features developed for the Korn shell and the C shell. TCSH is an enhanced version of the C shell, originally developed for BSD versions of UNIX. PDKSH is a subset of the UNIX Korn shell, whereas the Z shell is an enhanced version of the Korn shell. Although their UNIX counterparts differ greatly, the Linux shells share many of the same features. In UNIX, the Bourne shell lacks many capabilities found in the other UNIX shells. In Linux, however, the BASH shell incorporates all the advanced features of the Korn shell and C shell, as well as the TCSH shell. All four shells are available for your use, though the BASH shell is the default. So far, all examples in this book have used the BASH shell. You log into your default shell, but you can change to another shell by entering its name. tcsh invokes the TCSH shell, bash the BASH shell, ksh the PDKSH shell, and zsh the Z shell. You can leave a shell with the CTRL-D or exit command. You only need one type of shell to do your work. This chapter describes common features of the BASH shell, such as history and aliases, as well as how to configure the shell to your own needs using shell variables and initialization files. The other shells share many of the same features, and use similar variables and initialization files.
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