Linux Heroic Commands

linux_heroic_commands.md

Linux Heroic Commands

From a tutorial somewhere...

1. sudo !! : re-executing the last command as sudo.
2. Ctrl + X + E in the terminal to open an editor.
3. Create a super fast RAM disk (hard drive on the RAM):

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

   Can get 5-200 times the HD speed.
4. In order to not put a command in the history, you can add a leading space to the comand (e.g. ls -l).
5. If you wish to fix a really long command, you can open an editor with the last command with fc.
6. Quickly create folders with permutations:

   mkdir -p folder/{sub1,sub2}/{sub1,sub2,sub3} # or
   mkdir -p folder/{1..100}/{1..100} # creates 10,000 folders

   The -p is essential because it creates the parent folder if it doesn't exist when trying to create the child ones.
7. Intercept stdout and log to file (tee):

   cat file | tee -a log | cat > /dev/null

8. Exit a terminal but leave all processes running:

   disown -a && exit # -a is for all the processes