Linux sem 1

ls

List directories and files

cd

Change between directories

pwd

Current path

mv

Moves files and directories from one directory to another or renames a file or directory

cut -d” “ -f1

Cut a field

cut -c1

Cut a character

rm file.txt

Delete file

chmod ugo

Change mod = changing permission

su admin

Allows users to switch to the root account and perform administrative tasks

sudo admin

Allows users to execute specific commands with elevated privileges

|

Pipe; allow you to connect the output of one command as the input to another

&&

ensure that the command on the right of it will be run if the command on the left of it succeeds and ensures that the second command isn't run if the first command fails

||

executes the second command only if the first command fails

date

used to display and set the system date and time

Format:

dayname month daynum hh:mm:as timezone year

head file.txt

used to display the first 10 part of files

tail file.txt

prints the last few number of lines (10 lines by default) of a certain file

cat file.txt

reads files

cat > file.txt

Entering input into the file

cat » file.txt

Adding text to the current file (the previous text stays)

ls -l

detailed directory listing, showing file permissions, number of links, owner, group, size, and time of last modification

ls -s

List files and sort by file size

ls -lh

Show the file sizes in human readable format

ls -d */

Show only directories

wc -l

Count the number of rows in a file

wc -w

Count the number of lines in a file

wc -m

Count the number of characters in a file

grep

Show lines that contain…

echo $()

1. Prints

2. Calculates

3. Finds

4. Executes