blocks|key|1056127|text|我不认为在ksh和bash中有任何可移植的方法可以做到这一点。在bash中，您可以使用caller输出检测到它，但我不认为在ksh中有这样的输出。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1056128|entityMap^0|17|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I don't think there is any portable way to do this in both ksh and bash. In bash you could detect it using <code>caller</code> output, but I don't think there exists equivalent in ksh.

blocks|key|1056145|text|如果您的Bash版本知道BASH_SOURCE数组变量，请尝试如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1056146|#+man+bash+%7C+less+-p+BASH_SOURCE
#[[+${BASH_VERSINFO[0]}+-le+2+]]+&&+echo+'No+BASH_SOURCE+array+variable'+&&+exit+1

[[+"${BASH_SOURCE[0]}"+!=+"${0}"+]]+&&+echo+"script+${BASH_SOURCE[0]}+is+being+sourced+..."|code-block|syntax|javascript|1056147|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If your Bash version knows about the BASH_SOURCE array variable, try something like:

<pre><code># man bash | less -p BASH_SOURCE
#[[ ${BASH_VERSINFO[0]} -le 2 ]] &amp;&amp; echo 'No BASH_SOURCE array variable' &amp;&amp; exit 1

[[ "${BASH_SOURCE[0]}" != "${0}" ]] &amp;&amp; echo "script ${BASH_SOURCE[0]} is being sourced ..."
</code></pre>

blocks|key|1271040|text|这似乎可以在Bash和Korn之间移植：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271041|[[+$_+!=+$0+]]+&&+echo+"Script+is+being+sourced"+%7C%7C+echo+"Script+is+a+subshell"|code-block|syntax|javascript|1271042|与此类似的行或像pathname="$_"这样的赋值(带有稍后的测试和操作)必须位于脚本的第一行或shebang之后的行(如果使用，应该是用于ksh的，以便它在大多数情况下都能工作)。|offset|length|style|CODE|1271043|entityMap^0|0|0|8|D|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This seems to be portable between Bash and Korn:

<pre><code>[[ $_ != $0 ]] &amp;&amp; echo "Script is being sourced" || echo "Script is a subshell"
</code></pre>

A line similar to this or an assignment like <code>pathname="$_"</code> (with a later test and action) must be on the first line of the script or on the line after the shebang (which, if used, should be for ksh in order for it to work under the most circumstances).

blocks|key|1056258|text|这在以后的脚本中有效，并且不依赖于_变量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1056259|##+Check+to+make+sure+it+is+not+sourced:
Prog=myscript.sh
if+[+$(basename+$0)+=+$Prog+];+then
+++exit+1++#+not+sourced
fi|code-block|syntax|javascript|1056260|或|1056261|[+$(basename+$0)+=+$Prog+]+&&+exit|1056262|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This works later on in the script and does'nt depend on the _ variable:

<pre><code>## Check to make sure it is not sourced:
Prog=myscript.sh
if [ $(basename $0) = $Prog ]; then
 exit 1 # not sourced
fi
</code></pre>

or 

<pre><code>[ $(basename $0) = $Prog ] &amp;&amp; exit
</code></pre>

blocks|key|1056304|text|$_是相当脆弱的。你必须检查它作为你在脚本中做的第一件事。即使这样，也不能保证包含shell的名称(如果是来源的)或脚本的名称(如果执行)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1056305|例如，如果用户设置了BASH_ENV，则在脚本的顶部，$_包含在BASH_ENV脚本中执行的最后一个命令的名称。|1056306|我发现的最好的方法是像这样使用$0：|1056307|name="myscript.sh"

main()
{
++++echo+"Script+was+executed,+running+main..."
}

case+"$0"+in+*$name)
++++main+"$@"
++++;;
esac|code-block|syntax|javascript|1056308|不幸的是，这种方式在zsh中不能直接使用，因为functionargzero选项的作用超出了它的名称，并且在缺省情况下是启用的。|1056309|为了解决这个问题，我在我的.zshenv中放入了unsetopt+functionargzero。|1056310|entityMap^0|0|2|0|A|8|R|2|W|8|0|F|2|0|0|N|F|0|D|7|O|O|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|T|$]]

<code>$_</code> is quite brittle. You have to check it as the first thing you do in the script. And even then, it is not guaranteed to contain the name of your shell (if sourced) or the name of the script (if executed).

For example, if the user has set <code>BASH_ENV</code>, then at the top of a script, <code>$_</code> contains the name of the last command executed in the <code>BASH_ENV</code> script.

The best way I have found is to use <code>$0</code> like this:

<pre><code>name="myscript.sh"

main()
{
 echo "Script was executed, running main..."
}

case "$0" in *$name)
 main "$@"
 ;;
esac
</code></pre>

Unfortunately, this way doesn't work out of the box in zsh due to the <code>functionargzero</code> option doing more than its name suggests, and being on by default.

To work around this, I put <code>unsetopt functionargzero</code> in my <code>.zshenv</code>.

blocks|key|1271136|text|我需要一个可以在mac、linux和bash.version+>=+3上运行的一行程序，但这些答案都不符合我的要求。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271137|[[+${BASH_SOURCE[0]}+=+$0+]]+&&+main+"$@"|code-block|syntax|javascript|1271138|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I needed a one-liner that works on [mac, linux] with bash.version >= 3 and none of these answers fit the bill.

<pre class="lang-sh prettyprint-override"><code>[[ ${BASH_SOURCE[0]} = $0 ]] &amp;&amp; main "$@"
</code></pre>

blocks|key|1056365|text|我跟踪了mklement0+compact+expression。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1056366|这很巧妙，但我注意到在使用ksh的情况下，它可能会失败，如下所示：|1056367|/bin/ksh+-c+./myscript.sh|code-block|syntax|javascript|1056368|(它认为它是源码的，这并不是因为它执行子subshell)，但表达式将检测到这一点：|1056369|/bin/ksh+./myscript.sh|1056370|此外，即使表达式是紧凑的，其语法也不能与所有shell兼容。|1056371|因此，我以以下代码结束，它适用于bash、zsh、dash和ksh|1056372|SOURCED=0
if+[+-n+"$ZSH_EVAL_CONTEXT"+];+then+
++++[[+$ZSH_EVAL_CONTEXT+=~+:file$+]]+&&+SOURCED=1
elif+[+-n+"$KSH_VERSION"+];+then
++++[[+"$(cd+$(dirname+--+$0)+&&+pwd+-P)/$(basename+--+$0)"+!=+"$(cd+$(dirname+--+${.sh.file})+&&+pwd+-P)/$(basename+--+${.sh.file})"+]]+&&+SOURCED=1
elif+[+-n+"$BASH_VERSION"+];+then
++++[[+$0+!=+"$BASH_SOURCE"+]]+&&+SOURCED=1
elif+grep+-q+dash+/proc/$$/cmdline;+then
++++case+$0+in+*dash*)+SOURCED=1+;;+esac
fi|1056373|可以随意添加新奇的shell支持:)|1056374|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/28776166/6255594^0|4|S|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1B|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@]|C|$]]|$1|S|3|T|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|U|3|V|5|6|7|1F|8|@]|9|@]|C|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|X|$Y|$5|Z|10|11|C|$12|13]]]]

I followed <a href="https://stackoverflow.com/a/28776166/6255594">mklement0 compact expression</a>.

That's neat, but I noticed that it can fail in the case of ksh when invoked as this:

<pre><code>/bin/ksh -c ./myscript.sh
</code></pre>

(it thinks it's sourced and it's not because it executes a subshell)
But the expression will work to detect this:

<pre><code>/bin/ksh ./myscript.sh
</code></pre>

Also, even if the expression is compact, the syntax is not compatible with all shells.

So I ended with the following code, which works for bash,zsh,dash and ksh

<pre><code>SOURCED=0
if [ -n "$ZSH_EVAL_CONTEXT" ]; then 
 [[ $ZSH_EVAL_CONTEXT =~ :file$ ]] &amp;&amp; SOURCED=1
elif [ -n "$KSH_VERSION" ]; then
 [[ "$(cd $(dirname -- $0) &amp;&amp; pwd -P)/$(basename -- $0)" != "$(cd $(dirname -- ${.sh.file}) &amp;&amp; pwd -P)/$(basename -- ${.sh.file})" ]] &amp;&amp; SOURCED=1
elif [ -n "$BASH_VERSION" ]; then
 [[ $0 != "$BASH_SOURCE" ]] &amp;&amp; SOURCED=1
elif grep -q dash /proc/$$/cmdline; then
 case $0 in *dash*) SOURCED=1 ;; esac
fi
</code></pre>

Feel free to add exotic shells support :)

blocks|key|1056445|text|我最终检查了[[+$_+==+"$(type+-p+"$0")"+]]|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1056446|if+[[+$_+==+"$(type+-p+"$0")"+]];+then
++++echo+I+am+invoked+from+a+sub+shell
else
++++echo+I+am+invoked+from+a+source+command
fi|code-block|syntax|javascript|1056447|当使用curl+...+%7C+bash+-s+--+ARGS动态运行远程脚本时，在运行实际脚本文件时，$0将只是bash而不是普通的/bin/bash，所以我使用type+-p+"$0"来显示bash的完整路径。|1056448|测试：|1056449|curl+-sSL+https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath+%7C+bash+-s+--+/a/b/c/d/e+/a/b/CC/DD/EE

source+<(curl+-sSL+https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath)
relpath+/a/b/c/d/e+/a/b/CC/DD/EE

wget+https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath
chmod+%2Bx+relpath
./relpath+/a/b/c/d/e+/a/b/CC/DD/EE|1056450|entityMap^0|6|T|0|0|3|Q|1J|4|1T|9|28|C|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|R|$]]

I ended up with checking <code>[[ $_ == "$(type -p "$0")" ]]</code>

<pre><code>if [[ $_ == "$(type -p "$0")" ]]; then
 echo I am invoked from a sub shell
else
 echo I am invoked from a source command
fi
</code></pre>

When use <code>curl ... | bash -s -- ARGS</code> to run remote script on-the-fly, the $0 will be just <code>bash</code> instead of normal <code>/bin/bash</code> when run actual script file, so I use <code>type -p "$0"</code> to show full path of bash.

test:

<pre><code>curl -sSL https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath | bash -s -- /a/b/c/d/e /a/b/CC/DD/EE

source &lt;(curl -sSL https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath)
relpath /a/b/c/d/e /a/b/CC/DD/EE

wget https://github.com/jjqq2013/bash-scripts/raw/master/common/relpath
chmod +x relpath
./relpath /a/b/c/d/e /a/b/CC/DD/EE
</code></pre>

blocks|key|1271274|text|这个问题的解决方法不是编写需要知道这一点才能正确运行的代码。这样做的方法是将代码放入一个函数中，而不是放入需要获取源代码的脚本的主线中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271275|函数中的代码只能是return+0或return+1。这只会终止函数，这样控制就会返回到调用该函数的任何地方。|offset|length|style|CODE|1271276|无论函数是从源脚本的主线调用的，还是从顶级脚本的主线调用的，还是从另一个函数调用的，这都是有效的。|1271277|使用采购来引入“库”脚本，这些脚本只定义函数和变量，但实际上并不执行任何其他顶级命令：|1271278|.+path/to/lib.sh+#+defines+libfunction
libfunction+arg|code-block|syntax|javascript|1271279|否则：|1271280|path/to/script.sh+arg+#+call+script+as+a+child+process|1271281|而不是：|1271282|.+path/to/script.sh+arg++#+shell+programming+anti-pattern|1271283|entityMap^0|0|9|8|I|8|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|18|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|1A|8|@]|9|@]|A|$O|P]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|N|7|1C|8|@]|9|@]|A|$O|P]]|$1|Y|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Z|$]]

The fix for this issue is not to write code that needs to know such a thing in order to behave correctly. And the way to do that is to put the code into a function, and not into the mainline of a script that needs to be sourced.
Code inside a function can just <code>return 0</code> or <code>return 1</code>. This terminates just the function, so that control returns to whatever invoked the function.
This works whether the function is called from the mainline of a sourced script, from the mainline of a top-level script, or from another function.
Use sourcing to bring in &quot;library&quot; scripts that only define functions and perhaps variables, but don't actually execute any other top-level commands:
<pre><code>. path/to/lib.sh # defines libfunction
libfunction arg
</code></pre>
or else:
<pre><code>path/to/script.sh arg # call script as a child process
</code></pre>
and not:
<pre><code>. path/to/script.sh arg # shell programming anti-pattern
</code></pre>

I have a script where I do not want it to call <code>exit</code> if it's being sourced. 

I thought of checking if <code>$0 == bash</code> but this has problems if the script is sourced from another script, or if the user sources it from a different shell like <code>ksh</code>. 

Is there a reliable way of detecting if a script is being sourced?

How to detect if a script is being sourced

我有一个脚本，如果它是源码，我不希望它调用exit。我想检查一下$0 == bash，但是如果脚本来自另一个脚本，或者用户来自不同的shell，比如ksh，这就有问题了。有没有一种可靠的方法来检测脚本是否源码？

问如何检测脚本是否源码
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