Linux Basics Flashcards
What does pwd do?
Tells you where you are in the directory
What does cat file1.txt file2.txt do?
Prints both files out
What does “head -n 10 file.txt”
Prints first 10 lines of the file
What does “tail -n 10 file.txt” do?
Prints bottom 10 lines of the file
What does less file.txt do?
Lets you view the file, one line at a time
How to quit once you have entered?
Press q
What does touch do and what is the side effect?
Updates the access and modification timestamp
- side effect it makes a new file
mkdir new
Creates a new directory
mv some_file.txt destination
moves some file to a new destination
rm some_file.txt
Removes the file
rm -r some_directory
deletes some_directory and all its files
cp course_file.txt destination
copies the file to the destination
cp -R my_direct new_direct
copies the directory to the new directory
grep “hello” words.txt
Searches for each instance of the word
grep -r “hello”
Searches for each instance of the word in the current directory
-find some_dreictory -name hello.txt
Find files and directories by name
Sudo
stands for superuser
Permissions, how many characters?
10
Show me the 10 characters of permissions
drwxrwxrwx
What does d, r, w, and x mean?
D stands for directory
r for read
w for write
x for execute
What does each set of rwx rwx rwx mean?
First one is owner
second is group
three is everyone else
How to change permissions?
chmod -R u=rwx,g=,o= DIRECTORY
-R means do it for all in the directory
How do you look at the directory writes permission for each file in the directory?
ls -l
How do you revoke the right to execute a file?
chmod -x FILENAME
How do you allow to execute a file?
chmod +x FILENAME
How to pipe?
echo command | command2
How to interrupt?
ctrl+c
How to kill?
kill PID
How do you see the current path of where you are?
pwd
How to create a new file?
touch new_file.txt
How do you create a new directory?
mkdir new_direct
how to rename a file?
mv some_file.txt new_name.txt
How do you remove a file?
rm some_file.txt
How do you remove all files in a directory?
rm -r some_directory.txt
