Redo the last command as if I had sudoed
alias please='sudo $(fc -ln -1)'
Use this all the time
(Ubuntu) Install a package I don’t have but tried to use
alias ok='eval $($(fc -ln -1) 2>&1 | sed -n 2p)'
Go back to previous directory
alias back='cd $OLDPWD'
I use this one most of all when copying files to destinations outside of the current directory, especially if the paths involved are pretty long. Sometimes after copying, I may follow the file to the destination just to check what I just did by changing directory to the destination directory. ‘back’ lets me return to where I was before pretty effortlessly. This alias takes advantage of the
OLDPWD environment variable.
Free up system memory
alias freemem='echo "echo 1 > /proc/sys/vm/drop_caches" | sudo sh'
For this example, I started to copy a 4 GB file so that I knew my ram would start to be used up. Here, you can see my memory available on the left is decreasing as I hit enter for purposes of demonstration. (displaying my system memory is done using the
PROMPT_COMMAND environment variable). You can see when I use
freemem, I get my memory back.
alias dog='pygmentize -g'
This works like cat in that it dumps the contents of a file to the screen. It does not concatenate files. But it does read the shebang and print the code with syntax highlighting, if it can. Requires python-pygmentize
Find a file or directory in working dir matching a string.
I use this one a LOT! Ignores case and prints line number.
alias lsg='ls -la| grep -ni'
I have many variants of this one, most notably to do this recursively through directories beneath you:
ls -laR | grep -in
If you don’t have pygmentize for my
dog alias, make installing it a breeze
alias gimme='sudo apt-get install'