Man1 - perlsh.1p

perlsh - one-line perl evaluator with line editing function and variable name completion function

perlsh

This program reads input a line, and evaluates it by perl interpreter, and prints the result. If the result is a list value then each value of the list is printed line by line. This program can be used as a very strong calculator which has whole perl functions.

This is a sample program Term::ReadLine::Gnu module. When you input a line, the line editing function of GNU Readline Library is available. Perl symbol name completion function is also available.

Before invoking, this program reads ~.perlshrc/ and evaluates the content of the file.

When this program is terminated, the content of the history buffer is saved in a file ~.perlsh_history/, and it is read at next invoking.

You can customize the behavior of perlsh by setting following variables in ~.perlshrc/;

$PerlSh::PS1

The primary prompt string. The following backslash-escaped special characters can be used. \h: host name \u: user name \w: package name \!: history number The default value is `=\w[\!]$ =’.

$PerlSh::PS2

The secondary prompt string. The default value is `=> =’.

$PerlSh::HISTFILE

The name of the file to which the command history is saved. The default value is ~/.perlsh_history.

$PerlSh::HISTSIZE

If not undef, this is the maximum number of commands to remember in the history. The default value is 256.

$PerlSh::STRICT

If true, restrict unsafe constructs. See use strict in perl man page. The default value is 0;

~/.perlshrc

This file is eval-ed at initialization. If a subroutine afterinit is defined in this file, it will be eval-ed after initialization. Here is a sample. # -- mode: perl -- # decimal to hexa sub h { map { sprintf(“0x%x”, $_ ) } @_;} sub tk { $t->tkRunning(1); use Tk; $mw = MainWindow->new(); } # for debugging Term::ReadLine::Gnu sub afterinit { *t = \$PerlSh::term; *a = \$PerlSh::attribs; }

~/.perlsh_history

~/.inputrc

A initialization file for the GNU Readline Library. Refer its manual for details.

Term::ReadLine::Gnu http://search.cpan.org/dist/Term-ReadLine-Gnu/

GNU Readline Library https://tiswww.cwru.edu/php/chet/readline/rltop.html

Hiroo Hayashi <hiroo.hayashi@computer.org>