Linux operations Practice-Regular expressions

First, Linux operation and maintenance exercises and answers

1. Display the lines in the/etc/passwd file that end with bash

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2. display the two-digit or three-digit number in the/etc/passwd file

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3. display lines with ' LISTEN ' followed by 0, one or more whitespace characters in the ' netstat-tan ' command result

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4. Add user bash, Testbash, basher, and Nologin user (Nologin user's shell is/sbin/nologin), then find the same line in the/etc/passwd file as the user name and its shell name

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5. Display the default shell and UID of root, CentOS, or User1 user on the current system (please create these users beforehand, if not present)

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6, find a word in the/etc/rc.d/init.d/functions file (the middle of the word can be underlined) followed by a set of parentheses line

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7, use echo to output a path, and then egrep find its path base name; Further use Egrep to remove its directory name

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8. find the number between 1-255 in the result of ifconfig command execution

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This article is from the "Small Togo" blog, please be sure to keep this source http://icestick8586.blog.51cto.com/9867871/1690907

Linux operations Practice-Regular expressions