Steampunkery/cicada

A simple bash-like Unix shell written in Rust

Cicada Unix Shell

Cicada is a simple Unix shell written in Rust. It's ready for daily use.

Documents

• Environment Variables
• Built-in Commands
• Completion
• RC File
• History

Try out cicada with Docker

$ docker pull mitnk/cicada
$ docker run --rm -it mitnk/cicada

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

do math arithmetic directly in the shell!

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

Cicada is also a library (BETA)

Read APIs here: docs/as-lib.md.

Install Cicada

Please refer to docs/install.md.

FAQs

• Why another shell?
• Compare to bash?
• Compare to ion?
• Why functions support is in won't do list?
• Will cicada be POSIX-compatible?
• Will my bash/zsh scripts continue work in cicada?
• Windows support?

To do list

• job controls (Ctrl-Z, fg, bg etc)
• and less...

Won't do list

• functions
• and more...