Linux Common Command Combat practice

1. Display all files or directories with L, ending with a lowercase letter, and with at least one digit in the middle of the/var directory

ls-d/var/l*[0-9]*[[:lower:]) or ls-d/var/l*[[:d igit:]]*[[:lower:]]

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2. display files or directories that start with any digit in the/etc directory and end with a non-digit

LS/ETC/[0-9]*[^0-9] or ls-d/etc/[[:d igit:]]*[^[:d igit:]]

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3, display/etc/directory with a non-letter beginning, followed by a letter and any other arbitrary length of any character file or directory

ls/etc/[^[:alpha:]][[:alpha:]]*

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4. Display all files or directories in/etc that start with a non-numeric end of M

ls-d/etc/m*[^[:d igit:]] or ls-d/etc/m*[^0-9]

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5. Display all files or directories ending with. D in the/etc directory

Ls-d/ETC/*.D

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6. Display the files or directories with the end of. conf and beginning with m,n,r,p in the/etc directory

Ls-d/etc/[mnrp]*.conf

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1. Convert the contents of the/etc/issue file to uppercase and save to the/tmp/issue.out file

Tr ' A-Z ' A-Z ' </etc/issue &>/tmp/issue.out

tr [A-z] [a-z] </etc/issue >/tmp/issue

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2. Convert the current system login user's information to uppercase and save to the/tmp/who.out file

W.H.O. | Tr ' A-Z ' A-Z ' >/tmp/who.out

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3, a Linux user to the root email, request the message titled "Help", the message body is as follows:

Hello, I am Username, the system version is here,pleasehelp me to check it, thanks!

Operating system Version Information

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echo "Hello, I am $HOSTNAME, the system version is here,please help me check it thanks! ' Cat/etc/redhat-release ' "|mail-s help root

echo "Hello, I am ' uname-n ', the system Versionis here,please help me check it thanks! ' Cat/etc/redhat-release ' "|mail-s help root

4, the/root/file list, displayed as a line, and the file name separated by a space

Ls-a/root/| TR "\ n" ""

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5. The contents of the File1 file are: "1 2 3 4 5 6 7 8 9 10" Calculates the sum of all numbers

6. Remove the ' ^m ' character from the Windows text file

Cat file.txt|tr-d "^m"

7, processing string "Xt.,l 1 jr#! $mn 2 c*/fe3 uz4", keep only the numbers and spaces

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8. Display the path variable in a separate row for each directory

echo $PATH |tr ":" \ n "

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9. Delete blank lines of the specified file

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10. Display each word (letter) in the file in a separate line with no blank lines

Cat File.txt | Tr-s "" \ n "

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1. Create TestUser UID 1234, main group: Bin, Auxiliary Group: ROOT,FTP,SHELL:/BIN/CSH Home:/testdir/testuser

Useradd testuser-u 1234-g bin-g root,ftp-s/bin/csh-d/testdir/testuser

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2, modify TestUser uid:4321, main group: root, Auxiliary Group: Nobody,loginname:test,home:/home/test Home Data migration

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Usermod-u 4321-g root-g nobody-l "test"-d/home/test-m testuser

Usermod-u 4321-g root-g nobody-l test-d/home/test-m testuser

3, Batch create account: User1...user10

Uid:3000-3009,shell:/bin/csh,home:/testdir/username

Passwd:usernamepass

This article is from "Wake up your not alarm clock but dream" blog, please be sure to keep this source http://purify.blog.51cto.com/10572011/1833352

Linux Common Command Combat practice