Common commands for file management: ls, touch, cp, mv, rm, m

 1. Show all files or directories under the / var directory that begin with l and end with a lowercase letter with at least one digit in the middle

 2. Files or directories under the display / etc directory that begin with any number and end with a non-number

 3. Display a file or directory under the / etc/ directory that begins with a non-letter, followed by a letter and any other character of any length

 4. Display all files or directories under the / etc/ directory that begin with rc, followed by numbers between 0 and 6, and other files or directories with any characters

 5, display all files or directories ending in .d in the / etc directory

 6. Show all files or directories in the / etc directory that end with .conf and begin with mreco ndir r p.

 7. Show only hidden files and directories under / root

 8. Show only non-hidden directories under / etc

9. Define the alias command baketc, backup all files under the / etc/ directory to a separate subdirectory of / data every day, and require the subdirectory format to be backupYYYY-mm-dd. The backup process is visible.

 10. Create / data/rootdir directory, and copy all files under / root to this directory. The original permissions are required.

11. How to create / testdir/dir1/x, / testdir/dir1/y, / testdir/dir1/x/a,/testdir/dir1/x/b, / testdir/dir1/y/a, / testdir/dir1/y/b

12. How to create / testdir/dir2/x, / testdir/dir2/y, / testdir/dir2/x/a,/testdir/dir2/x/b

13. How to create / testdir/dir3, / testdir/dir4, / testdir/dir5, / testdir/dir5/dir6,/testdir/dir5/dir7

 1. Show all files or directories under the / var directory that begin with l and end with a lowercase letter with at least one digit in the middle

2. Display files or directories in the / etc directory that begin with any number and end with a non-number

3. Display a file or directory in the / etc/ directory that begins with a non-letter, followed by a letter and any other character of any length

4. Display all files or directories under the / etc/ directory that begin with rc, followed by numbers between 0 and 6, and other files or directories with any characters

5. Show all files or directories ending in .d in the / etc directory

6. Show all files or directories in the / etc directory that end with .conf and begin with mpenery ndir r rep.

 7. Show only hidden files and directories under / root

 8. Show only non-hidden directories under / etc

9. Define the alias command baketc, backup all files under the / etc/ directory to a separate subdirectory of / data every day, and require the subdirectory format to be backupYYYY-mm-dd. The backup process is visible.

 10. Create / data/rootdir directory, and copy all files under / root to this directory. The original permissions are required.

11. How to create / testdir/dir1/x, / testdir/dir1/y, / testdir/dir1/x/a,/testdir/dir1/x/b, / testdir/dir1/y/a, / testdir/dir1/y/b

12. How to create / testdir/dir2/x, / testdir/dir2/y, / testdir/dir2/x/a,/testdir/dir2/x/b

13. How to create / testdir/dir3, / testdir/dir4, / testdir/dir5, / testdir/dir5/dir6,/testdir/dir5/dir7