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The contents of a variable are often used as command arguments. A common command argument is a directory path name. It can be tedious to retype a directory path that is being used over and over again. If you assign the directory path name to a variable, you can simply use the evaluated variable in its place. The directory path you assign to the variable is retrieved when the variable is evaluated with the $ operator. The next example assigns a directory path name to a variable and then uses the evaluated variable in a copy command. The evaluation of ldir (which is $ldir) results in the path name /home/chris/letters. The copy command evaluates to cp myletter /home/ chris/letters.
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$ ldir=/home/chris/letters $ cp myletter $ldir
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You can obtain a list of all the defined variables with the set command. The next example uses the set command to display a list of all defined variables and their values:
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$ set
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poet ldir $
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Virgil /home/chris/letters
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If you decide you do not want a certain variable, you can remove it with the unset command. The unset command undefines a variable. The next example undefines the variable poet. Then the user executes the set command to list all defined variables. Notice that poet is missing.
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$ unset poet $ set ldir /home/chris/letters $
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You can place shell commands within a file and then have the shell read and execute the commands in the file. In this sense, the file functions as a shell program, executing shell commands as if they were statements in a program. A file that contains shell commands is called a shell script. You enter shell commands into a script file using a standard text editor such as the Vi editor. The sh or . command used with the script's filename will read the script file and execute the commands. In the next example, the text file called lsc contains an ls command that displays only files with the extension .c: lsc
ls *.c
$ sh lsc main.c calc.c $ . lsc main.c calc.c
You can dispense with the sh and . commands by setting the executable permission of a script file. When the script file is first created by your text editor, it is only given read and write permission. The chmod command with the +x option will give the script file executable permission. (Permissions are discussed in 13.) Once it is executable, entering the name of the script file at the shell prompt and pressing ENTER will execute the script file and the shell commands in it. In effect, the script's filename becomes a new shell command. In this way, you can use shell scripts to design and create your own Linux commands. You only need to set the permission once. In the next example, the lsc file's executable permission for the owner is set to on. Then the lsc shell script is directly executed like any Linux command.
$ chmod u+x lsc $ lsc main.c calc.c
You may have to specify that the script you are using is in your current working directory. You do this by prefixing the script name with a period and slash combination, ./, as in ./lsc. The period is a special character representing the name of your current working directory. The
slash is a directory path name separator, as explained more fully in 12. The following example would show how you would execute the hello script:
$ ./lsc main.c calc.c
Just as any Linux command can take arguments, so also can a shell script. Arguments on the command line are referenced sequentially starting with 1. An argument is referenced using the $ operator and the number of its position. The first argument is referenced with $1, the second with $2, and so on. In the next example, the lsext script prints out files with a specified extension. The first argument is the extension. The script is then executed with the argument c (of course, the executable permission must have been set). lsext
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