13 lines
784 B
Markdown
13 lines
784 B
Markdown
## Marking a script as executable
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Sometimes, you may need to mark a script as an executable to run it. On Linux, this can be accomplished by `chmod +x [FILE]`, where `[FILE]` is the file you want to mark as executable. To unmark a file as executable, use `chmod -x`
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## The Shebang
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There are various shells with their own language syntax (`sh`, `bash`, `fish`, etc). Therefore, more complicated scripts will indicate a particular shell by specifying the absolute path to the interpreter as the first line, prefixed by `#!` like this:
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```sh
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#!/bin/sh
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echo "Hello, World!"
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```
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`#!/bin/sh` means that this script can be executed by the binary located at `/bin/sh`, and so the reader knows this is a `sh`(ell) script.
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## Variables
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In bash, variable assignment is done with the `=` operat |