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Next, set the permissions on the file to be executable:
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Next, edit the file
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$ vi count_lines.sh
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and add the appropriate code:
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#!/bin/bash echo "Number of lines in file " $1 wc l $1
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The script takes the first command-line argument, prints the number of lines, and then exits. Run the script with the command
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$ ./count_lines.sh /etc/group
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which gives the following output:
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Number of lines in file /etc/group 43
Part II:
System Essentials
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.
Testing File Properties
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. 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, httpd.conf), 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. The following example revises the previous script that counted the number of lines in a file. The script first verifies whether the target file (specified by $1) exists. If a file exists, the command should count the number of lines in the target file as before:
#!/bin/bash if test -a $1 then echo "Number of lines in file " $1 wc l $1 else echo "The file" $1 "does not exist" fi
Otherwise, an error message will be printed. If the /etc/group file does not exist, for example, you d really want to know about it:
bash-2.05# ./count_lines.sh /etc/group The file /etc/group does not exist
7:
Shells, Scripts, and Scheduling
There may be some situations in which you want to test another file property. For example, the /etc/shadow password database must be readable only by the superuser. Thus, if you execute a script to check whether the /etc/shadow file is readable by a nonprivileged user, it should not return a positive result. You can check file readability by using the r option rather than the a option. Here s the revised script:
#!/bin/bash if test r $1 then echo "I can read the file " $1 else echo "I can t read the file" $1 fi
You can also test the following file permissions using the test facility:
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