blob: 3a24602a4648a5ed816bfa3852c164421298d3c4 (
plain) (
blame)
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
51
52
53
54
55
56
57
58
59
60
61
62
|
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Content-Language" content="en" />
<title>execline: the posix-cd command</title>
<meta name="Description" content="execline: the posix-cd command" />
<meta name="Keywords" content="execline command cd chdir posix posix-cd" />
<!-- <link rel="stylesheet" type="text/css" href="//skarnet.org/default.css" /> -->
</head>
<body>
<p>
<a href="index.html">execline</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> The <tt>posix-cd</tt> program </h1>
<p>
<tt>posix-cd</tt> changes the current working directory to a
given directory, then executes a program.
</p>
<h2> Interface </h2>
<pre>
posix-cd <em>dir</em> <em>prog...</em>
</pre>
<p>
<tt>posix-cd</tt> changes the current working directory to <em>dir</em>
according to the
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html">POSIX
specification for a <tt>cd</tt> external utility</a>. Then, if <em>prog...</em> is
not empty, it execs into it.
</p>
<h2> Notes </h2>
<ul>
<li> <tt>posix-cd</tt> is only available when execline has been configured
with the <tt>--enable-pedantic-posix</tt> option, and in this case, the
<a href="cd.html">cd</a> binary is a symbolic link to it. </li>
<li> <tt>posix-cd</tt> fully conforms to the
<a href="https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html">POSIX
specification</a>. When <em>prog...</em> is not empty, the behaviour of a
<tt>cd</tt> utility is not specified by POSIX, so <tt>posix-cd</tt> extends
the spec to be actually useful and usable in an execline program with the same
interface as the regular execline <a href="cd.html">cd</a> command. </li>
<li> Nobody ever executes or needs the external version (i.e. not a shell
builtin) of the POSIX <tt>cd</tt> command. Compared to the regular execline
<a href="cd.html">cd</a>, <tt>posix-cd</tt> is uselessly bloated and slow.
The only reason it exists is that some distributions refuse to package
execline correctly unless it is strictly POSIX-compliant; the
<tt>--enable-pedantic-posix</tt> configure option is there to appease them. </li>
</ul>
</body>
</html>
|
