bash 将文本附加到命令行的输出
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append text to an output from command line
提问by user3369729
I am looking to run this command
我正在寻找运行此命令
asterisk -rx "core show calls" | grep "active" | cut -d' ' -f1
it will output a number but I want it to append a "0:" at the beginning so the output looks like this
它会输出一个数字，但我希望它在开头附加一个“0：”，所以输出看起来像这样
0:{output from command}
0:{命令输出}
any ideas?
有任何想法吗？
回答by Ignacio Vazquez-Abrams
echo -n "0:" ; asterisk ......
回答by Kostanos
By using sedon the end:
通过使用sed上月底：
asterisk -rx "core show calls" | grep "active" | cut -d' ' -f1 | sed 's/^/0:/g'
by ^ in regular expression you indicate to put 0: in the beginning. You can add any text this way. Also you can add it in any other place inside a string, not only in the beginning.
通过 ^ 在正则表达式中表示将 0: 放在开头。您可以通过这种方式添加任何文本。您也可以将它添加到字符串内的任何其他位置，而不仅仅是在开头。
