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CHAPTER 2 BASH
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If you are going to customize the value of an environment variable, be sure to use the export command to ensure that the variable is accessible to all future programs and shells you launch. If you don t use export, the change will only be visible to the current shell which is generally not what you want. For example, to change the HISTSIZE variable to 10 in your account only, you would add the following lines in .bashrc: HISTSIZE=10 export HISTSIZE By updating HISTSIZE to 10, you limit the command history to the last ten commands you have executed, instead of the default of 1,000. You can view the list of commands you have executed using the history command or cycle through each command using the Up- and Down-arrow keys.
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Note: For more information on environment variables, see http://tldp.org/LDP/ Bash-BeginnersGuide/html/sect_03_02.html.
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Creating and Running Your Own Script
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A script is basically a list of commands to be run in sequence Until now, you have been running commands one line at a time. Some system administration tasks under are sequences of commands, which you may find yourself running all the time. You can automate these tasks by bundling the commands into a list by writing a script. For example, use a text editor to create a file called hello.sh with the following contents: echo "What is your name " read name echo "Hello, $name!" The first line displays the text "What is your name ". The second reads keyboard input and stores the value in the variable name. The third line displays "Hello" followed by the value stored in the variable name, followed by an exclamation point (!). To execute this script, we issue the command sh hello.sh. The sh command is used to run a Bash interpreter on your script. You should see a result similar to Listing 2-21. Listing 2-21. The Output of sh hello.sh [juan@srv1-manila ~]$ sh hello.sh What is your name Don Juan Hello, Don Juan! Let s try another example. Supposing you would like to list the successful and failed login attempts of a particular user, you would use the commands last and lastb, respectively. To filter out logs that pertain to a particular user, you need to use grep. Finally, you would like to enter the username through keyboard input. To do this, let s create logs.sh with the following content: echo "Enter a username: " read username echo "Successful login attempts: "
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echo "----" last | grep $username echo "Failed login attempts: " echo "----" lastb | grep $username As you can see from the code, the pattern to be searched by grep is based on what will be read from the keyboard input. To execute the script, issue the command sh logs.sh. You should see a result similar to Listing 2-22. Listing 2-22. The Output of sh logs.sh Enter a username: juan Successful login attempts: ---juan pts/1 :0.0 juan :0 juan :0 Failed login attempts: ---juan tty1
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Tue Apr 28 20:27 still logged in Tue Apr 28 20:25 still logged in Tue Apr 28 20:25 - 20:25 (00:00) Wed Apr 29 06:16 - 06:16 (00:00)
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You will get a permission denied error, as you are running the script as a regular user. You need to switch to root because only the administrator can run the last and lastb commands. Instead of keyboard input, you may want to use arguments as inputs. Arguments are stored in special variables by default. The first argument is stored in $1, the second in $2, the third in $3, and so on. Again, arguments are separated by spaces. For example, to accept parameters into logs.sh you will need to update the file by replacing it with the following contents: echo "Successful login attempts: " echo "----" last | grep $1 echo "Failed login attempts: " echo "----" lastb | grep $1 As you can see, we replaced the pattern in grep to take the value of $1, which is the first argument that will be passed into the script. To execute the command, enter sh logs.sh juan. You should see a result similar to Listing 2-23. Listing 2-23. The Output of sh logs.sh with an Argument Successful login attempts: ---juan pts/1 :0.0 juan :0 juan :0 Failed login attempts: ---juan tty1
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To run the script without using sh, like the commands you are familiar with, you will first need to place the script in any directory listed in the PATH variable. By default the value of PATH for root is
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