通过 grep 仅打印匹配的单词，而不是整行 [英] Print only matching word, not entire line through grep

问题描述

我熟悉 bash 中的 shell 编程，但由于某种原因 egrep -o 仅打印匹配的单词不起作用并显示如下错误.

I am familiar with shell programming in bash, but for some reason egrep -o to print only matching words is not working and displays error as below.

环境是 putty 上的 ksh unix 控制台，而不是 linux 或 ubuntu 终端......感谢任何建议！

Environment is ksh unix console on putty and not linux or ubuntu terminal......any advice is appreciated!

终端输入&输出:

Terminal input & output :

AB12 $ echo "i am a boy" | grep -w "am"
i am a boy
AB12 $ echo "i am a boy" | egrep -o "am"
egrep: illegal option -- o
usage: egrep [ -bchilnsv ] [ -e exp ] [ -f file ] [ strings ] [ file ] ...
AB12 $ echo$
ksh: echo$: not found
AB12 $ echo $SHELL
/bin/ksh
AB12 $ echo "i am a boy" | grep -o "am"
grep: illegal option -- o
Usage: grep -hblcnsviw pattern file . . .
AB12 $

PS : 类似的线程，但已经尝试过:grep 可以只显示匹配搜索模式的词吗?

PS : Similar thread but tried already : Can grep show only words that match search pattern?

推荐答案

我假设这是您要连接的 Solaris 设备.grep 的 Solaris 版本没有 -o 选项.所以你可以

I am assuming this is a Solaris box you are connecting to. Solaris' version of grep does not have the -o option. So you can either

• 在您的 Solaris 机器上安装 GNU grep(它可能已经安装在 /usr/sfw/bin 中，或者您可能会使用 pkg install//solaris/text/gnu-grep);或
• 改用 awk(参见这个问题)

• install the GNU grep on your Solaris box (it might already be installed in /usr/sfw/bin, or you might have luck with pkg install //solaris/text/gnu-grep); or
• use awk instead (see this SO question)

在我的盒子上看到:

$ uname
SunOS
$  echo "i am a boy" | grep -o "am"
grep: illegal option -- o
Usage: grep -hblcnsviw pattern file . . .
$  echo "i am a boy" | /usr/sfw/bin/ggrep -o "am"
am

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