shell.pl -- Elementary shell commands

This library provides some basic (POSIX) shell commands defined in Prolog, such as pwd and ls for situations where there is no shell available or the shell output cannot be captured.

shell

Execute an interactive shell. The following options are tried to find a suitable shell command:

The Prolog flag shell
The environment variable $SHELL
The Prolog flag posix_shell
The environment variable %comspec% (Windows only)

Errors: - existence_error(config, shell) if no suitable shell can be found.

cd

cd(Dir)

Change working directory

Manage the directory stack:

pushd/1 is as cd/1, pushing th old directory on a stack
pushd/0 swaps the current directory with the top of the stack
popd/0 pops to the top of the stack
dirs/0 lists the current directory and the stack.

pwd

Print current working directory

ls

ls(+Pattern)

Listing similar to Unix =ls -F=, flagging directories with =/=.

mv(+From, +To) is det

Move (Rename) a file. If To is a directory, From is moved into the directory. Uses expand_file_name/2 on the From argument.

rm(+File) is det

Remove (unlink) a file

name_to_file(+Name, -File)[private]

Convert Name into a single file.

warning(+Fmt, +Args:list) is det[private]

table(+List, +Width)//[private]

Produce a tabular layout to list all elements of List on lines with a maximum width of Width. Elements are placed as ls does:

1  4  7
2  5  8
3  6

file_style(++File, =Style) is det[multifile]

True when File should be listed as a terminal hyperlink. The default only links Prolog source files.

Arguments:

Style - is either url to make a hyperlink or a valid style argument for ansi_format/3.

table_layout(+Items, +PageWidth, -Layout:dict) is det[private]

Compute the number of columns, rows and the column width to create a tabular layout for Items.

Re-exported predicates