nobles5e/tinyshell

A tiny linux shell.

Tiny Shell

Additional features

1. In my shell one can execute several commands at once (commands are sparated by ;)

For example:

echo 123 ; echo 5 | base64 ; echo lalal5 | base64 | base64 -d

2. If any of the commands in a command with pipe fails to run, then the all the processes created by the command line will be terminated if we run the shell with -k flag. For example

./shell -k

This is the default behaviour of fish shell. If -k is not passed then the command will still be run and added to the job control (we may use ctrl-c to terminate it if it is in foreground). This is the default behavior of bash shell and dash shell etc.

Files

Header files are in /include; source files are in /src

To compile the shell

Firstly mkdir -p build && cd build then cmake .. then make.

To run the shell

After building the shell, run

./shell

./shell -h will print the usage.

To bring a program foreground:

tsh> fg <jobid>

for example (I did not remove the & at the end since I found that bash does not remove it either)

tsh> jobs
0: sleep 20 &
1: sleep 30 &
tsh > fg 0

There is also

tsh> bg <jobid>

Others

cd, pipe, background & foreground (jobs, fg, bg), exit are implemented. errors are handled the job control for commands with pipe is also well implemented.

TODO

• Full unit test and mock test.
• Simple job queue implementation.
• Autocompletion.