# fish shell

## Printing list of numbered files

```shell
printf '%03d\n' (seq 0 99)
```

## Showing a function or alias

```shell
# Replace function_name with your function or alias
type function_name
```

## Showing all functions

```shell
functions
```

## adding `less` variable

Found the answer to this [here](https://stackoverflow.com/questions/27471823/zsh-global-alias-equivalent-in-fish-shell#comment43416010_27471823)

The only way I can see to code your specific example is :

```shell
function L; env $argv | less --chop-long-lines; end
```

and invoke with

```shell
L echo "hello world"
```

\-- obviously using a function as a command, not like a zsh global alias.

## Defining an Alias

1. Define alias in shell

```
alias rmi="rm -i"
```

1. Define alias in config file

```
alias rmi="rm -i"
```

1. This is equivalent to entering the following function:

```
function rmi
    rm -i $argv
end
```

1. Then, to save it across terminal sessions:

```
funcsave rmi
```

This last command creates the file `~/.config/fish/functions/rmi.fish`.

## Differences between bash and fish:

* setting variables
  * bash: `var=value`
  * fish: `set var value`
* function arguments
  * bash: `"$@"`
  * fish: `$argv`
* function local variables
  * bash: `local var`
  * fish: `set -l var`
* conditionals I
  * bash: `[[ ... ]]` and `[ ... ]`
  * fish: `test ...`
* conditionals II
  * bash: `if cond; then cmds; fi`
  * fish: `if cond; cmds; end`
* conditionals III
  * bash: `cmd1 && cmd2`
  * fish: `cmd1; and cmd2`
  * fish (as of fish 3.0): `cmd1 && cmd2`
* command substitution
  * bash: `output=$(pipeline)`
  * fish: `set output (pipeline)`
* process substitution
  * bash: `join <(sort file1) <(sort file2)`
  * fish: `join (sort file1 | psub) (sort file2 | psub)`