94 lines
3.1 KiB
HTML
94 lines
3.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=utf-8">
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<title>Differences between Qshell and other interpreters</title>
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<LINK rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</HEAD>
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<body bgcolor="#FFFFFF">
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2>Differences with other interpreters</h2>
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<p>While <strong>qsh</strong> is compatible with other standard
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shell interpreters, there are several differences:</p>
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<ul>
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<li>There is no support for the <strong><></strong>
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redirection operator.<p></li>
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<li>There is no support for a command history list, the <strong>
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HISTSIZE</strong> and <strong>HISTFILE</strong> variables, or the
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<strong>fc</strong> (or <strong>hist</strong>) built-in utility. As
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an alternative, the QSH CL command has support for command
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retrieval.<p></li>
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<li>There is no support for command line editing and the <strong>
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EDITOR</strong> variable.<p></li>
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<li>There is no support for the <strong>MAIL</strong>, <strong>
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MAILCHECK</strong>, and <strong>MAILPATH</strong> variables.<p></li>
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<li>There is no support for job control. There is no concept of a
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foreground or background process group on i5/OS<SUP>(TM)</SUP>. This means it is
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possible for multiple jobs to be reading from the terminal at the
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same time. <strong>qsh</strong> does not support: <p>
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<ul>
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<li>The <strong>fg</strong> or <strong>bg</strong> built-in
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utilities.<p></li>
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<li>Using the <em>Suspend</em> key (typically <ctrl>z) to
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send the SIGTSTP signal to the foreground process group.<p></li>
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<li>Using the <em>Stop</em> key (typically <ctrl>s) to send
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the SIGSTOP signal to the foreground process group.<p></li>
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<li>Using the <em>Restart</em> key (typically <ctrl>q) to
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send the SIGCONT signal to the foreground process group.<p></li>
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<li>Using the <em>Interrupt</em> key (typically <ctrl>c) to
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send the SIGINT signal to the foreground process group. As an
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alternative, you can use SysReq 2 from an interactive shell session
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to send the SIGINT signal to the shell interpreter process and any
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currently running child processes.<p></li>
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</ul>
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<p></li>
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<li>There is no support for the <em>End-of-file</em> key (typically
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<ctrl>d). As an alternative, use a <a href=
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"redirect.htm#here">here-document</a> to redirect text entered at
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the command line to standard input of a utility.<p></li>
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<li>
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When calling a program, there is a limit to the maximum number of
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parameters you can pass to the command. If the program was built for
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a release before V5R3, the limit is 255 parameters. If the program was
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built for V5R3 or a subsequent release, the limit is 65535 parameters.
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<p></li>
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<li>When using path name expansion with some case insensitive file
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systems, you must use upper case characters in the pattern. For
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example, to list all of the program objects in the QSHELL library
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you should use this command:
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<pre>
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ls /qsys.lib/qshell.lib/*.PGM.
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</pre>
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<p></li>
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</ul>
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</body>
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</html>
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