blocks|key|1231749|text|您是否尝试过将字符串变量传递给for循环？例如，Bash将自动拆分为空格。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1231750|sentence="This+is+++a+sentence."
for+word+in+$sentence
do
++++echo+$word
done|code-block|syntax|javascript|1231751|This
is
a
sentence.|1231752|entityMap^0|F|3|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|H|7|S|8|@]|D|@]|E|$I|J]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Did you try just passing the string variable to a <code>for</code> loop? Bash, for one, will split on whitespace automatically.

<pre><code>sentence="This is a sentence."
for word in $sentence
do
 echo $word
done
</code></pre>

&nbsp;

<pre><code>This
is
a
sentence.
</code></pre>

blocks|key|1446640|text|$+echo+"This+is+++a+sentence."+%7C+tr+-s+"+"+"\012"
This
is
a
sentence.|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1446641|要检查空格，请使用grep：|unstyled|1446642|$+echo+"This+is+++a+sentence."+%7C+grep+"+"+>+/dev/null
$+echo+$?
0
$+echo+"Thisisasentence."+%7C+grep+"+"+>+/dev/null+++++
$+echo+$?
1|1446643|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>$ echo "This is a sentence." | tr -s " " "\012"
This
is
a
sentence.
</code></pre>

For checking for spaces, use grep:

<pre><code>$ echo "This is a sentence." | grep " " &gt; /dev/null
$ echo $?
0
$ echo "Thisisasentence." | grep " " &gt; /dev/null 
$ echo $?
1
</code></pre>

blocks|key|1446663|text|只需使用bash检查空格：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1446664|[[+"$str"+=+"${str%25+*}"+]]+&&+echo+"no+spaces"+%7C%7C+echo+"has+spaces"|code-block|syntax|javascript|1446665|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|$]]

For checking spaces just with bash:

<pre><code>[[ "$str" = "${str% *}" ]] &amp;&amp; echo "no spaces" || echo "has spaces"
</code></pre>

blocks|key|1231846|text|只需使用内置的shell+"set“即可。例如,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1231847|set+$text|code-block|syntax|javascript|1231848|在那之后，$text中的单个单词将是$1、$2、$3等。|1231849|set+--+junk+$text
shift|1231850|处理$text为空或以破折号开头的情况。例如：|1231851|text="This+is++++++++++a++++++++++++++test"
set+--+junk+$text
shift
for+word;+do
++echo+"[$word]"
done|1231852|这是打印|1231853|[This]
[is]
[a]
[test]|1231854|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Just use the shells &quot;set&quot; built-in. For example,
<pre><code>set $text
</code></pre>
After that, individual words in $text will be in $1, $2, $3, etc. For robustness, one usually does
<pre><code>set -- junk $text
shift
</code></pre>
to handle the case where $text is empty or start with a dash. For example:
<pre><code>text=&quot;This is a test&quot;
set -- junk $text
shift
for word; do
 echo &quot;[$word]&quot;
done
</code></pre>
This prints
<pre><code>[This]
[is]
[a]
[test]
</code></pre>

blocks|key|1231903|text|我喜欢转换为数组，以便能够访问单个元素：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1231904|sentence="this+is+a+story"
stringarray=($sentence)|code-block|syntax|javascript|1231905|现在您可以直接访问单个元素(从0开始)：|1231906|echo+${stringarray[0]}|1231907|或者转换回字符串以进行循环：|1231908|for+i+in+"${stringarray[@]}"
do
++:
++#+do+whatever+on+$i
done|1231909|当然，前面已经回答了直接遍历字符串的问题，但这个答案的缺点是不能跟踪单个元素以供以后使用：|1231910|for+i+in+$sentence
do
++:
++#+do+whatever+on+$i
done|1231911|另请参见Bash+Array+Reference。|offset|length|1231912|entityMap|0|LINK|mutability|MUTABLE|url|http://www.gnu.org/software/bash/manual/html_node/Arrays.html#Arrays^0|0|0|0|0|0|0|0|0|4|K|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1C|8|@]|9|@$U|1D|V|1E|1|1F]]|A|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

I like the conversion to an array, to be able to access individual elements:

<pre><code>sentence="this is a story"
stringarray=($sentence)
</code></pre>

now you can access individual elements directly (it starts with 0):

<pre><code>echo ${stringarray[0]}
</code></pre>

or convert back to string in order to loop:

<pre><code>for i in "${stringarray[@]}"
do
 :
 # do whatever on $i
done
</code></pre>

Of course looping through the string directly was answered before, but that answer had the the disadvantage to not keep track of the individual elements for later use:

<pre><code>for i in $sentence
do
 :
 # do whatever on $i
done
</code></pre>

See also <a href="http://www.gnu.org/software/bash/manual/html_node/Arrays.html#Arrays" rel="noreferrer">Bash Array Reference</a>.

blocks|key|1446782|text|echo+$WORDS+%7C+xargs+-n1+echo|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1446783|这将输出每个单词，您可以在之后根据需要处理该列表。|unstyled|1446784|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>echo $WORDS | xargs -n1 echo
</code></pre>

This outputs every word, you can process that list as you see fit afterwards.

blocks|key|1446821|text|对于我的用例，最好的选择是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1446822|grep+-oP+'\w%2B'+file|code-block|syntax|javascript|1446823|基本上，这是一个匹配连续非空格字符的正则表达式。这意味着任何类型和任何数量的空格都不匹配。-o参数在不同的行上输出每个匹配的单词。|1446824|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For my use case, the best option was:
<pre><code>grep -oP '\w+' file
</code></pre>
Basically this is a regular expression that matches contiguous non-whitespace characters. This means that any type and any amount of whitespace won't match. The -o parameter outputs each word matches on a different line.

blocks|key|1446881|text|关于这一点的另一种看法(使用Perl)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1446882|$+echo+foo+bar+baz+%7C+perl+-nE+'say+for+split+/\s/'
foo
bar
baz|code-block|syntax|javascript|1446883|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|$]]

Another take on this (using Perl):
<pre><code>$ echo foo bar baz | perl -nE 'say for split /\s/'
foo
bar
baz
</code></pre>

blocks|key|1446898|text|$+echo+foo+bar+baz+%7C+sed+'s/+/\n/g'|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1446899|foo
bar
baz|code-block|syntax|javascript|1446900|entityMap^0|2|X|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

$ <code>echo foo bar baz | sed 's/ /\n/g'</code>
<pre><code>foo
bar
baz
</code></pre>

I have a string containing many words with at least one space between each two. How can I split the string into individual words so I can loop through them?

The string is passed as an argument. E.g. <code>${2} == "cat cat file"</code>. How can I loop through it?

Also, how can I check if a string contains spaces?

How to split one string into multiple strings separated by at least one space in bash shell?

Perl

我有一个包含许多单词的字符串，每个单词之间至少有一个空格。如何将字符串拆分成单独的单词，以便循环遍历它们？字符串作为参数传递。例如，${2} == "cat cat  file"。我怎么才能遍历它？另外，如何检查字符串是否包含空格？

问如何在bash shell中将一个字符串拆分成至少由一个空格分隔的多个字符串？
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问如何在bash shell中将一个字符串拆分成至少由一个空格分隔的多个字符串？
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