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IT/Scripting.md
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@ -29,23 +29,33 @@ In Bash, different styles of quotes (or a backtick) mean different things:
| Backtick (\`) | While a backtick is not technically a quotation mark, it's included here. Backticks are used to substitute the output a command in a location:<br>```<br>sudo chown `id -u` /some/directory<br>``` | | Backtick (\`) | While a backtick is not technically a quotation mark, it's included here. Backticks are used to substitute the output a command in a location:<br>```<br>sudo chown `id -u` /some/directory<br>``` |
## Conditionals ## Conditionals
A basic if statement in bash looks like this: A basic if statement in bash looks like this:
``` ```bash
if somecommand; then if somecommand; then
# The code here will be run if somecommand has an exit code of 0 # The code here will be run if somecommand has an exit code of 0
fi fi
``` ```
Note that the if statement is terminated by `fi`. This is fairly standard throughout bash scripting, where the blocks are closed with the reverse text used to open them. Note that the if statement is terminated by `fi`. This is fairly standard throughout bash scripting, where the blocks are closed with the reverse text used to open them.
You can also make use of `else` for more complex conditional logic: You can also make use of `else` or `elif` for more complex conditional logic:
``` ```bash
if somecommand; then if somecommand; then
# If the command succeeds, run this code # If the command succeeds, run this code
else else
# If the command fails, run this code. # If the command fails, run this code.
fi fi
``` ```
`elif`:
```bash
if [ "$1" = "hello" ]; then
echo "hello yourself"
elif [ "$1" = "goodbye" ]; then
echo "nice to have met you"
echo "I hope to see you again"
else
echo "I didn't understand that"
fi
```
If you need even more
## Commands ## Commands
| Command | Description | | Command | Description |
| ------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | ------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |