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:

1. The Prolog flag shell
2. The environment variable $SHELL
3. The Prolog flag posix_shell
4. The environment variable %comspec% (Windows only)

Errors

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

 cd

 cd(Dir)

Change working directory

 pushd

 pushd(+Dir)

 popd

 dirs

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

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 cd(Arg1)

 pushd(Arg1)

 dirs

 ls(Arg1)

 popd