Cicada Unix Shell

Cicada is a simple Unix shell written in Rust.

Documents

• Environment Variables
• Built-in Commands
• Completion
• RC File
• History
• Job Control
• Customize Prompt
• Scripting

Try out cicada with Docker

$ docker pull mitnk/cicada
$ docker run --rm -it mitnk/cicada
(in-cicada) $ cinfo

Features

Run programs and pipelines

$ ls | head -n3
Desktop
Documents
Downloads

$ echo foo bar | awk -F " " '{print $2, $1}'
bar foo

With redirections

$ ls file-not-exist 2>&1 | wc > e.txt
$ cat e.txt
       1       7      46

Command substitution

$ ls -l `which sh`
-r-xr-xr-x  1 root  wheel  618512 Oct 26  2017 /bin/sh

$ echo "Time is $(date)."
Time is Sun Sep  2 12:04:13 CST 2018.

Run multiple commands (with logical)

$ echo foo; echo bar
foo
bar

$ echo foo && echo bar
foo
bar

$ echo foo || echo bar
foo

Shell expansions

$ echo sp{el,il,al}l
spell spill spall

$ echo $SHELL
/usr/local/bin/cicada

$ echo *
Cargo.lock Cargo.toml LICENSE Makefile README.md src target

Math arithmetic directly in the shell!

$ 1 + 2 * 3 - 4
3
$ (1 + 2) * (3 - 4) / 8.0
-0.375
$ 2 ^ 31
2147483648

Install Cicada

Please refer to docs/install.md.

Cicada is also a library (BETA)

Read APIs here: https://docs.rs/cicada/.

FAQs

• Why another shell?
• Compare to bash?
• When will functions get supported in cicada?
• Is cicada POSIX-compatible?
• Will my bash/zsh scripts continue work in cicada?
• Windows support?

To Do List

• to support simple Functions