August 27 Jobs

Twilight Summer, social ますますご sheng のこととおび shen expands on げます. Alter は のご high with をり, thick bootcut Royal Rite Shen expands.

Basic regular

1. Display the line in the/etc/passwd file ending with bash;

cat/etc/passwd | grep color=auto "bash$"

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

cat/etc/passwd | grep "[10-999]" At first I wrote this, it was wrong

I refer to other people's comments modified as follows, it is useful:

cat/etc/passwd | grep Color=auto CAT/ETC/PASSWDX | grep "\<[1-9][0-9]\{1,2\}\>"

3, display the ' Netstat-tan ' command results with ' LISTEN ' followed by 0, one or more blank characters end of the line;

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4, add user Bash,testbash, basher and Nologin user (Nologin the user's shell is/sbin/nologin), and then find the/etc/passwd file in the user name with the shell name of the line;

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Add the user first, the order of the parameters here should be noted

I wrote it first.

cat/etc/passwd | grep "^\ (\<[[:alnum:]]\>*\). *\1$".

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Extended Regular

1. Display the default shell and UID of root, CentOS or User1 user on the current system;

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3 users are selected, and filter columns are not filtered

2, 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;

Cat/etc/rc.d/init.d/functions |egrep "\<[[:alpha:]]+_? [[: alpha:]]+\>/(/)]

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3, use echo to output a path, and then egrep find its path base name; further: Use Egrep to remove its directory name;

Echo "/home/gh/haha" | Egrep back with a judgment when the last one

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4. Find out the number between 1-255 in the result of ifconfig command execution;

The number between 1-255 is definitely a separate word, so use prefix \< tail \> to fix and re-screen

I have 2 different cases [0-199] and [200-255]

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August 27 Jobs