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where file is a valid filename that contains a Bourne shell script. The first line should contain a directive that points to the absolute location of the shell:
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#!/bin/sh
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Shells, Scripts, and Scheduling
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You also can execute Bourne shell scripts by calling them with a new shell invocation, or by calling them directly if the executable bit is set for the executing user. For example, the following three commands would each execute the script file myscript.sh:
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$ . myscript.sh $ sh myscript.sh $ ./myscript.sh
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However, only the source command (.) preserves any environment variable settings made in the script.
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basename
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The basename command strips a filename of its extension. The format of this command is
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basename filename.ext
where filename.ext is a valid filename like mydata.dat. The basename command parses mydata.dat, and extracts mydata. Because file extensions are not mandatory in Solaris, this command is very useful for processing files copied from Windows or MS-DOS.
The cat command prints out the contents of the file, without any special screen-control features like scrolling backward or forward in a file. The format of this command is as follows:
cat filename
To display the groups database, for example, you could run the following command:
$ cat /etc/group root::0:root other::1: bin::2:root,bin,daemon sys::3:root,bin,sys,adm adm::4:root,adm,daemon uucp::5:root,uucp mail::6:root tty::7:root,tty,adm lp::8:root,lp,adm nuucp::9:root,nuucp staff::10:
Part II:
System Essentials
The cd command changes the current working directory to a new directory location, which you can specify in either absolute or relative terms. The format of this command is as follows:
cd directory
For example, if the current working directory is /usr/local, and you type the command
cd bin
the new working directory would be /usr/local/bin. However, if you type the command
cd /bin
the new working directory would be /bin. For interactive use, relative directory names are often used; however, scripts should always contain absolute directory references. Typing cd by itself takes the user to their home directory.
chgrp
The chgrp command modifies the default group membership of a file. The format of this command is
chgrp group file
where group is a valid group name, defined in the groups database (/etc/groups), and file is a valid filename. Because permissions can be assigned to individual users or groups of users, assigning a nondefault group membership can be useful for users who need to exchange data with members of different organizational units (e.g., the Webmaster who swaps configuration files with the database administrator and also exchanges HTML files with Web developers). Only the file owner or the superuser can modify the group membership of a file.
date
The date command prints the current system date and time. The format of this command is as follows:
date
The default output for the command is of this form:
Tuesday February 12 13:43:23 EST 2002
7:
Shells, Scripts, and Scheduling
You can also modify the output format by using a number of parameters corresponding to days, months, hours, minutes, and so on. For example, the command
date '+Current Date: %d/%m/%y%nCurrent Time:%H:%M:%S'
produces the following output:
Current Date: 06/09/00 Current Time:13:45:43
grep
The grep command searches a file for a string (specified by string) and prints the line wherever a match is found. The format of this command is as follows:
grep string file
The grep command is very useful for interpreting log files, where you just want to display a line that contains a particular code (e.g., a Web server logfile can be grepped for the string 404, which indicates a page was not found).
head
The head command displays the first page of a file. The format of this command is as follows:
head filename
The head command is very useful for examining the first few lines of a very long file. For example, to display the first page of the name service switch configuration file (/etc/nsswitch.conf), you could use this command:
$ # # # # # # head /etc/nsswitch.conf /etc/nsswitch.nisplus: An example file that could be copied over to /etc/nsswitch.conf; it uses NIS+ (NIS Version 3) in conjunction with files. "hosts:" and "services:" in this file are used only if the /etc/netconfig file has a "-" for nametoaddr_libs of "inet" transports. the following two lines obviate the "+" entry in /etc/passwd and /etc/group.
less
The less command prints a file on the screen, and it allows you to search backward and forward through the file. The format of this command is as follows:
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