USH

Content

• Description
• How to use
• Implemented functionality
• Additional functionality
• Developers
• License

Description

Implementation of basic command-line interpreter (based on zsh and bash), using the C programming language.

How to use

Compilation:

make
./ush

Reinstalliation:

make reinstall
./ush

Uninstalliation:

make uninstall

Implemented functionality

A set of builtins without any flags

• export;
• unset;
• local;
• exit;
• bye;
• history;
• return;
• true;
• false;
• jobs;
• fg without any arguments and with %n, %str, %+, %-, n, str, +, - arguments.

A set of builtins with flags

• env with next flags:

  • -i;
  • -P;
  • -u.

• cd with next flags:

  • -s;
  • -P;
  • -.

• pwd with next flags:

  • -L;
  • -P.

• which with next flags:

  • -a;
  • -s.

• echo with next flags:

  • -n;
  • -e;
  • -E.

Signals managing

• CTRL+D;
• CTRL+C;
• CTRL+Z.

Characters escaping

Next characters can be escaped to be used literally: space, ', ", $, (, ), \, `, {, }.

Tilde expansions

Tilde expansions ~ with the followinf tilde-prefixes:

• ~;
• ~/dir_name;
• username/dir_name;
• ~+/dir_name;
• ~-/dir_name.

Parameter expansions

• only basic form - ${parameter}.

Command substitutions of next forms

• `command`
• $(command)

Nested command substitutions also supported.

Additional functionality

• support of pipes |;
• support of logical operators && and ||;
• job control system (only for foregraund jobs and processes);
• command history using Arrow keys;
• command editing, cursor motion using Arrow keys;
• prompt customization using ALT+1 combination;
• the ; command line separator;
• errors management;
• user rnvironment management.

Developers

• Sergey Makov

• Yulia Bondarenko

• Alexander Piskun

License

Collision is an open-sourced software licensed under the MIT license.