doc/exec.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Language" content="en" />
    <title>execline: the exec program</title>
    <meta name="Description" content="execline: the exec program" />
    <meta name="Keywords" content="execline command exec" />
    <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> -->
  </head>
<body>

<p>
<a href="index.html">execline</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
</p>

<h1> The <tt>exec</tt> program </h1>

<p>
<tt>exec</tt> executes the command line it is given.
</p>

<h2> Interface </h2>

<pre>
     exec [ -c ] [ -l ] [ -a <em>argv0</em> ]<em>prog...</em>
</pre>

<p>
<tt>exec</tt> execs into <em>prog...</em>. It does nothing else.
<br /> Without options, <tt>exec</tt> can be seen as the execline NOP.
</p>

<h2> Options </h2>

<ul>
 <li> <tt>-c</tt>&nbsp;: empty the environment. <em>prog</em> is executed with no environment variables. <strong>Warning:&nbsp;</strong><em>prog</em> will run with an empty PATH, so make sure it does not rely on it. </li>
 <li> <tt>-l</tt>&nbsp;: login. Prepends <em>prog</em>'s argv[0] with a dash. </li>
 <li> <tt>-a <em>argv0</em></tt>&nbsp;: argv0. Replace <em>prog</em>'s argv[0] with <em>argv0</em>. This is done <em>before</em> adding a dash, if the <tt>-l</tt> option is also present. </li>
</ul>

<p>
The <tt>exec</tt> command, along with its options, is designed to emulate
the standard <tt>exec</tt> shell builtin, which replaces the shell with the
command it is given.
</p>

</body>
</html>