Tmpsh - Total Mastering Professional Shell || Temporary Shell

42 Lyon Project

tmpsh is a project of creating shell.

Builtins

To see any builtin's option, see the commentary above the function definition.

• echo : Write to stdout.
• cd : Change directory.
• exit : Quit the shell process.
• type : Description of command type.
• export : Export variables to environnement.
• setenv : Set or display environnement variables.
• unsetenv : Remove environnement variables.
• set : Set or display local variables.
• jobs : Display background jobs.
• fg : Set jobs in foreground.
• bg : Launch stopped jobs in background.
• alias : Set or display aliases.
• unalias : Unset aliases.
• hash : Remember or report utility locations.
• pwd : display working directory

Shell Grammar

Operators

Symbols
;
|
&&
||
&
=
+=
\
"
'
()
{}

Redirections

Generic format : [n]<redir-operetor> <word>

• [n]>word : redirect output
• [n]<word : redirect input
• [n]>>word : appending redirect output
• Here-Document :

[n]<<word
    here-document
delimiter

• <<< word : here-strings
• [n]<&word: duplicating an input file descriptor
• [n]>&word: duplicating an output file descriptor

Substitution

Variables specifications

1. Variables use = and += operator to assign or concatenate, respectively, a variable.
2. Assignation can contain spaces, like my_var = my_value.
3. Multiple variable can be set at once : var=value [var=value ...]
4. Temporary environnement variables can be set for a command : HOME=/ cd
5. If a substitution is performed, split string in mutliple argument, except if the substitution is the value of an assignation.

Available substitutions

• $WORD or ${WORD}: Replace variable.
• $() : Perform a command substitution.
• <() or >() : Perfom a process substitution.

Special variables

• ? : Return of the last command.
• ! : Pid of the last backgrounded command.
• $ : Pid of the shell process.
• ~ : Home of the given user.

Edition shortcut

• Clipboard

• Ctrl + w : cut the previous word.

• Ctrl + n : cut the next word.

• Ctrl + l : cut the line.

• Ctrl + p : paste.

• Navigation

• home or Ctrl + a : jump at the beginning of the line.

• end or Ctrl + e : jump at the end of the line.

• Alt + up : Move one line up.

• Alt + down : Move one line down

• Alt + left : Move one word left.

• Alt + right : Move one word right.

• Process Management

• Ctrl + c : ?

• Ctrl + d : ?

• Ctrl + \ : ?

• Ctrl + z : Set shell in background.

The upkey and the downkey are used for the history navigation.