Essential Linux Commands and Security Features
Essential Linux Commands
1. mkdir (Make Directory)
The mkdir command is used to create one or more new directories.
Syntax:
mkdir [options] directory_nameExamples:
- Create a single directory:
mkdir myfolder - Create nested directories using the
-poption:mkdir -p parent/child/grandchild - Create multiple directories at once:
mkdir dir1 dir2 dir3
2. cat (Concatenate and Display Files)
The cat command is used to view the contents of a file, create a file, or concatenate multiple files.
Syntax:
cat [options] [file_name(Essential Unix Commands for File and Directory Management
Copy a File
- cp source destination
- Where source and destination are filenames and may need to refer to full pathnames.
- Has the effect of copying file source to a new file destination
- cp source .
- Has the effect of copying file source into the current directory – the . is shorthand for “here”.
Remove/Delete a File
- rm file
- Use this command with caution – files deleted in this way cannot be retrieved.
Rename (Move) a File
- mv source destination
- Moves the file source to a new file destination.
- As well as renaming
Linux Command Line: Essential Operations and Scripting
1. Relationships:
- 1: fg% 3-D – Mounted disk
- 2: B – gzip-compressed
- 3: unmount – Nothing
- 4: mke3fs -C – Format
- 5: tar – Nothing
- 6: dd if-E – To back up
- 7: bg% 3 -F – Passing the task
- 8: tar cvf-A – To package
2. Commands:
- A: 2 + 2 =
expr 2 + 2 - B: Change user password:
passwd ana - C: Shut down computer:
shutdown -h now - D: Change ownership of ejer60 to user antonio:
chown antonio ejer60 - E: Delete all files:
rm * - F: Change the file name:
mv script52 ejer52 - G: Copy all files starting with “exercise” to the “Exercise”
Linux Commands and File System Management
Essential Linux Commands and File Management
ULI101: Introduction to UNIX/Linux and the Internet – Week 1, Lesson 2
Basic Linux Command Structure
- Command Format:
command argument1 argument2 ...- Examples:
pwd: Display current directory.date: Show current date and time.ls: List files in the current directory.ls /etc: List files in/etcdirectory.ls -l: Detailed file listing in the current directory.ls -l /etc: Detailed file listing in/etcdirectory.
- Examples:
Getting Help with Commands
man command: View manual for