The moment of truth is here run hello.sh: :~/scripts$ hello.sh So that the custom path is searched after the standard directories. export PATH=$PATH:/home/user/scripts Notice that I have appended the 'scripts directory' to the very end to our PATH variable. Use the export command to add your scripts directory to the PATH variable. If you want to run your bash script from anywhere, as if it were a regular Linux command, add the location of your shell script to the PATH variable.įirst, get the location of your script's directory (assuming you are in the same directory), use the PWD command: pwd When you run a command, your system checks the PATH for all the possible places it should look for to find the executable for that command. The bin directories are included in the PATH. Linux commands like echo, cat etc can be run from anywhere because their executable files are stored in the bin directories. The colon character (:) separates the path of each of the directories that your shell scans whenever you run a command. home/user/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin You can use echo to view the contents of that PATH variable: echo $PATH When you run any command on your terminal they shell looks for that command in a set of directories that are stored in the PATH variable. :~/scripts$ hello.shīash thought that you were trying to run a command named hello.sh. hello.sh to run the script you will get an error if you omit the leading. This is why bash is often synonymous to shell.Īdding your shell script to the PATH (so that it can be run from any directory) When you open a terminal in Linux, you are already running the default shell of your system.īash is often the default shell in most Linux distributions. If you have ever run any Linux command before, then you have used the shell. I'll explain things to you.īash which is short for “Bourne-Again shell” is just one type of many available shells in Linux.Ī shell is a command line interpreter that accepts and runs commands. Here's a screenshot of all the steps you saw above: Convert your shell script into bash scriptĬonfused? Don't be confused just yet. That was probably the easiest Hello World program you have ever written, right? You'll see Hello, World! printed on the screen. Now make the file hello.sh executable by using the chmod command as follows: chmod u+x hello.shĪnd finally, run your first shell script by preceding the hello.sh with your desired shell “bash”: bash hello.sh You can use this command in the terminal directly but in this test, you'll run this command through a shell script. So, basically you are using the echo command to print "Hello World". If you are using a desktop Linux, you may also use a graphical text editor like Gedit to add the text to this file. You can also use a terminal-based text editor like Vim, Emacs or Nano. Press Ctrl+D to save the text to the file and come out of the cat command.
Insert the following line in it by typing it in the terminal: echo 'Hello, World!' Now inside this 'scripts directory', create a new file named hello.sh using the cat command: cat > hello.sh Let’s first create a new directory named scripts that will host all our bash scripts.
INSTALLBUILDER RUN SHELLSCRIPT HOW TO
Let me show you how to create a simple bash shell script, how to run a bash script and what are the things you must know about shell scripting.
It may be a simple backup of a directory or it could be cleaning up temporary files or it can even be cloning of a database.Īutomating a task is one of the many useful scenarios where you can leverage the power of bash scripting. You will often find yourself repeating a single task on Linux over and over again.
If you have to do it more than once, automate it!
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