Minimal Linux shell written in C to study systemcalls and other POSIX concepts.
Command expressions have the syntax:
$ [./]cmd1 arg1 arg2 arg3 ... argN(sep)cmd2 arg1 arg2
where (sep) is a command separator or an operator. Example - pipeline operator'|',etc.
Some features are:
- Supports sequential command execution 'cmd1 ;cmd2;cmd3;cmd4 && cmd5'.
- Supports pipelines constructs 'A|B|C....' where A,B,C,... are command constructs.
- Supports Output redirection to a file '>' , '>>'.
- Supports File descriptor redirection.
- Supports background process execution 'cmd &'.
- Has it's own Finite State Machine based token generator and syntax checking functions.
You will need a Linux machine to run this shell.
- gcc
- cmake
After installing dependencies,
Run the following commands:
$ make
Then an executable will be generated in ./bin/ , you can run it using
$ bin/wish
To exit the shell write exit or press Ctrl+D in the shell.
- Shell Scripting
- Shell customisation