USH

My own implementation of unix shell.

A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems.

For more details Wiki

Compilation

• Write make in root directory to compile project.
• Compilation was done only on MacOS. Other OS were not tested

Functional overview:

• backspace
• command separator `;`
• logic operators `||` and `&&`
• external binary executing: path/binary_name, ls, mkdir etc. (all binaries form standart folders /bin /etc/bin etc.)
• export built-in
• unset built-in
• export built-in
• exit built-in
• env [-i -P -u] built-in
• cd [-s -P -] built-in
• pwd [-L -P] built-in
• which [-a -s] built-in
• echo [-n -e -E] built-in
• fg [%n %str] built-in
• Signals handling: CTRL+Z CTRL+D CTRL+C
• tilda: ~; ~/dir_name; ~username/dir_name; ~+/dir_name; ~-/dir_name
• variable substitution ${VARNAME}; $VARNAME
• command substitution `command`; $(command)

Overview