collection
It’s always good when you are looking for a way to do a task and you find great one-liner that just does the job right:
diff -rq directory1/ directory2
Switches “r” and “q” will recursively compare the two directories and showing brief output. Continue reading “Compare contents of two directories in bash”
Recently I was presented with a problem where mail server was dying because of 100K+ mails in queue.
Due to spool overload it was necessary to identify a pattern and delete it from the /var/spool/postfix/incoming/ and later this needed to be applied for certain inboxes that were filled with spam. Continue reading “Grep pattern in files if found delete the file”
To check which editor is set as default in your Debian distro you can do two things:
# update-alternatives --list editor /bin/nano /usr/bin/mcedit /usr/bin/vim.basic
To set for example vim.basic as your default editor you can use following command:
# update-alternatives --set editor /usr/bin/vim.basic update-alternatives: using /usr/bin/vim.basic to provide /usr/bin/editor (editor) in manual mode
Now if you again quick launch your editor with CTRL+X+CTRL+E you will notice that vim is invoked.
Here are some useful shell shortcuts that you can use to make your life easier:
CTRL+A - move to beginning of line CTRL+E - move to the end of the line CTRL+B - move backward CTRL+F - move forward CTRL+D - delete character under cursor CTRL+K - deletes text from cursor to the end of line CTRL+X+BACKSPACE - delete text from cursor to the beginning of the line CTRL+T - exchange character under cursor with previous character ESC+T - exchange two words before and under cursor ESC+U - converts text from cursor to the end of the word to UPPERCASE ESC+L - converts text from cursor to the end of the word to LOWERCASE CTRL+X+CTRL+E - launch default editor CTRL+L - Clears screen above current line CTRL+W - Delete word from cursor position to the left CTRL+R - Search through command history
I do not use vim macros often, but they can be useful from time to time. But when I need them I always need to re-learn the shortcuts, so now I will summarize them in simple example which will create number list from 1. to 50.
Start your vim editor by typing:
vim list.txt
Continue reading “Create incremental number list in vim with using simple macro”