Commands for LINUX file management and user and group management

1, display/etc directory, with non-letter beginning, followed by a letter and other arbitrary length of any character files or directories;

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

2. Copy all files or directories starting with P and ending with non-numbers in/etc directory to/tmp/mytest1 directory;

cp -a /etc/p*[^[:digit:]] /tmp/mytest1/

3. Convert the contents of the/etc/issue file to uppercase and save them to the/tmp/issue.out. file;

4. Summarize and describe how to use the user and group management class commands and complete the following exercises:

(1) Create group distro with GID 2019;

groupadd distro -g 2019

(2) Create user mandriva, whose ID number is 1005; the basic group is distro;

useradd -u 1005 -g distro mandriva

(3) Create user mageia with ID number 1100 and home directory/home/linux;

useradd -u 1100 -d /home/linux mageia

(4) Add password to user mageia, password is mageedu;

(5) Delete mandriva, but keep its home directory;

(6) Create user slackware, ID number of which is 2002, basic group is distro, additional group peguin;

(7)Change the default shell of slackware to/bin/tcsh;

(8)Add additional groups admins for user slackware;