Some useful Linux commands that you probably aren’t using in your daily life.

• redo the last command but as root

sudo !!

• open an editor to run a command (probably a long one)

ctrl + x + e

• create a super-fast disk for IO dependent tasks to run on it

mkdir -p /mnt/ramdisk && mount -t tmpfs tmpfs /mnt/ramdisk -o size=8192M

• don’t add the command to the history (add one space in front of the command)

 ls -l
history # check the history

• Fix or change a really long command that you last ran with a text editor

fc

• create a tunnel with SSH to port that is not open to the public (local port 8080 -> remote host’s 127.0.0.1 on port 6070)

ssh -L 8080:127.0.0.1:6070 root@my-public-server.com -N

• Log output but don’t show it on the console

cat somefile | tee -a log.txt | cat > /dev/null

• Exit terminal but leave all processes running

disown -a && exit

• Clear your terminal without “clear” command

ctrl + l  # L

• Paste the arguments of the previous command

alt + -

• Completely clean and clear your terminal

reset

• Get CPU info quickly

cat /proc/cpuinfo

• Get memory info quickly

cat /proc/meminfo

• Recursively find a text in a directory that have a lot of files in it

grep -rn /etc/ -e text_to_find

• Find files bigger than 100 MB

find -type f -size +100MB -exec ls -lah {} \;

Create a web server in the current directory to serve files from it

python -m SimpleHTTPServer

Find your public IP

curl ifconfig.me

Get a tree view of folders only three levels deep

tree -L 3

Get a tree view of processes

pstree

Use the last command’s last argument

!$

EDIT: (29–08–2021)

Use the last command’s all arguments

!*

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