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feat/updated linux shell scripting guide (#35767)

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Christopher McCormack
2019-06-25 15:49:07 -07:00
committed by Tom
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guide/english/linux/shell-scripting/index.md
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title: Shell scripting title: Shell scripting
--- ---
# Shell scripting # Shell Scripting
In the command line, a shell script is an executable file that contains a set of instructions that the shell will execute. Its main purpose is to reduce a set of instructions (or commands) in just one file. Also, it can handles bsome logic because it's a programming language. In the command line, a shell script is an executable file that contains a set of instructions that the shell will execute. Its main purpose is to reduce a set of instructions (or commands) to just one file. Also, it can handle logic because it's also an interpreter.
## How to create it ## How to Create a Shell Script
1) Create the file: 1. Create the file:
```bash ```bash
$ touch myscript.sh $ touch myscript.sh
``` ```
2) Add a [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) at the start of the file. The Shebang line is responsible for letting the command interpreter know which interpreter the shell script will be run with:
The file extension is not necessary. In linux, scripts can be executed even without .sh extension.
If the file is stored in `/user/bin` then the script should be able to be run from anywhere, provided the path is included in the `$PATH` variable.
2. Add a [shebang](https://en.wikipedia.org/wiki/Shebang_(Unix)) (`#!`) to the start of the file. The shebang line is responsible for letting the command interpreter know which interpreter the shell script will be run with.
```bash ```bash
$ echo "#!/bin/bash" > myscript.sh $ echo "#!/bin/bash" > myscript.sh
# or # or
$ your-desired-editor myscript.sh $ your-desired-editor myscript.sh
# write at the first line #!/bin/bash # ---------- myscript.sh ------
#!/bin/bash
...
# -----------------------------
``` ```
3) Add some commands:
3. Add commands to the file:
```bash ```bash
$ echo "echo Hello World!" >> myscript.sh $ echo "echo Hello World!" >> myscript.sh
``` ```
4) Give the file _execution_ mode:
4. Give the file _execution_ mode:
```bash ```bash
$ chmod +x myscript.sh $ chmod +x myscript.sh
``` ```
5) Execute it!
5. Execute the script!
```bash ```bash
$ ./myscript.sh $ ./myscript.sh
Hello World! Hello World!
``` ```
More info about shell-scripting can be found [here](https://www.shellscript.sh/) ## Additional Resources
- [More info about shell-scripting](https://www.shellscript.sh/)
//changes
script file extension is not necessary
In linux, script can be executed even without .sh extension.
for example test.sh can be executed if we leave it as test.
If we keep our script in user/bin then we can use script anywhere.