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that are accessible from within a shell script. For example, a shell script to move files from one computer to another computer might require parameters for the source host, the destination host, and the name of the file to be moved. Obviously, you want to be able to pass these arguments to the script, rather than hard-wiring them into the code. This is one advantage of shell scripts (and PERL programs) over compiled languages like C: scripts are easy to modify, and their operation is completely transparent to the user. Arguments to shell scripts can be identified by a simple scheme the command executed is referred to with the argument $0, with the first parameter identified as $1, the second parameter identified as $2, and so on, up to a maximum of nine parameters. Thus, a script executed with these parameters

would refer internally to cdrom as $1, scsi as $2, and ide as $3. Let s see how arguments can be used effectively within a script to process input parameters. The first script simply counts the number of lines in a file (using the wc command), specified by a single command-line argument ($1). To begin with, create an empty script file:

Next, set the permissions on the file to be executable:

and add the appropriate code:

The script takes the first command-line argument, prints the number of lines, and then exits. Run the script with the command

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But what stops the sun from exploding in a massive thermonuclear explosion simple gravity! The sun is caught in a constant struggle between wanting to expand outwards as a result of the energy of all the complex reactions occurring inside it, and the massive amount of gravity as a result of its enormous amount of matter, which wants to pull everything together. All of the atoms inside the sun are attracted to each other, this produces a massive compression which is trying to squeeze the sun inwards. Meanwhile, the energy generated by the nuclear reactions taking place is giving out heat and energy which wants to push everything outwards. Luckily for us, the two sets of forces balance out, so the sun stays constant!

which gives the following output:

Part II:

Although the individual activity of scripts is quite variable, the procedure of creating the script file, setting its permissions, editing its contents, and executing it on the command line remains the same across scripts. Of course, you may want to make the script available only to certain users or groups for execution. You can enable this by using the chmod command and explicitly adding or removing permissions when necessary.

One of the assumptions that we made in the previous script was that the file specified by $1 actually exists; if it doesn t exist, we obviously cannot count the number of lines it contains If the script is running from the command line, we can safely debug it and interpret any error conditions that arise (such as a file not existing or having incorrect permissions) However, if a script is intended to run as a scheduled job (using the cron or at facility), debugging it in real time is impossible Thus, writing scripts that can handle error conditions gracefully and intelligently is often useful, rather than leaving administrators wondering why a job didn t produce any output when it was scheduled to run The number one cause of run-time execution errors is the incorrect setting of file permissions.

How much will the work cost How much of the work can you afford to do now How much time will the work take How much rebate or tax credits will be available after you do the work How long will it take to recover the money spent to repair the problem How long do you plan to own your current home.

Although most users remember to set the executable bit on the script file itself, they often neglect to include error checking for the existence of data files that are used by the script For example, if you want to write a script that checks the syntax of a configuration file (like the Apache configuration file, httpdconf), you need to check that the file actually exists before performing the check otherwise, the script may not return an error message, and you may erroneously assume that the script file is correctly configured Fortunately, bash makes it easy to test for the existence of files by using the (conveniently named) test facility In addition to testing for file existence, the test facility can determine whether files have read, write, and execute permissions, prior to any read, write, or execute file access being attempted by the script.

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