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”
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 have several scripts that start when my Raspberry Pi is booted, one of them is to start screen session with IRSSI, but sometimes it can happen that two irssi processes are running.
To avoid that I am using a wrapper script eirssi.sh with just:
ps -C irssi || irssi
Continue reading “Bash check if process is running if not start it”
If you like me have for example folder filled with NES rom files that end with .nes extension and you would like to zip them all up in individual files to save some space.
I use this one-liner to zip all my NES collection so that it will take less space on my USB stick when I transfer it to my bartop arcade running RetroPie:
for file in *.nes ; do zip "$file.zip" "$file"; done
Continue reading “Bash zip all files in directory one by one in individual zips”
Put this into ~/.bashrc file of your account (if the file does not exist, you create it):
shopt -s histappend PROMPT_COMMAND="history -a;$PROMPT_COMMAND"
In order for this to start working you need to log out and in again.