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How do you execute (run) a shell script?Last revision August 6, 2004 There are two methods you can use to execute a shell script. First, you can give the script file name as an argument to an instance of
the shell program, that is, type a command like:
Second, you can give the name of the shell script itself as a command, just like any other program on Unix. First, you have to let the Unix kernel recognize that this is a shell script by doing the following two steps. Then you can simply type the shell's filename as a command name to execute it. The kernel will automatically start up a new C-shell process to execute the commands in the script. Note that your login shell has to be able to find the shell script file when you type its name as a command. The login shell only looks in a set of specific directories, called its path, to find files that contain programs. On pangea, the default path includes your current working directory, so you can run a shell script in the current directory simply by typing its name. Otherwise, type the absolute pathname of the script (for example, /home/sysop/farrell/programs/addup), or add the directory where the script lives to your standard path. Whenever you add a directory to your standard path, you must run the rehash built-in C-shell command to tell your login shell to rebuild its list of programs using your new path definition. To make your shell script file executable as a program, do these steps: Put the following line as the first line in your script:
Use chmod to set execute permission for your file. For instance,
if you want anyone to be able to execute the script file, use
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