I have been setting up some RESTful sensors for Home Assistant and to verify/fine tune their functionality, it dawned on me that I could use watch to continuously poll my endpoint to watch for a value change:
watch curl --no-progress-meter http://domain.tld/path/to/sensor/
If you're familiar with watch, you'll …
Email contents of a file:
echo -e "Subject: subject\n\n" | cat - /file | sendmail address
Email stdout:
output=`cmd` echo -e "Subject: subject\n\n$output" | sendmail address
Here's a simple shell wrapper that prints all sockets opened by Firefox.
1. Add the following function to your ~/.bashrc:
function ffsocks() { netstat -anp --inet | awk '/firefox/ { print $5 }' }
2. Reload your shell (or run source ~/.bashrc) to …
Before adding a script to cron and finding that it doesn't work because of a PATH issue, here's a handy command to test:
env -i ./script
This will run your script in the same environment that cron will.
$ dig +short myip.opendns.com @resolver1.opendns.com
GitLab was throwing me a 500 server error this morning after an upgrade via yum. To troubleshoot, I ran the self diagnose command from terminal:
# gitlab-rake gitlab:check
Which gave me the following error to fix:
All migrations up? ... no Try fixing it: sudo …
Error:
The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.
Solution:
# dd if=/dev/zero of=/dev/sdb bs=2048
Source: http://askubuntu.com/questions/675649/unable-to-delete-usb-drive-partitions-block-size-error
Use dmesg after plugging in your USB thumb drive to find the device name (/dev/sdb).
# umount /media/username/devicename # dd bs=4M if=/path/to/filename.iso of=/dev/sdb
Note, do not output to a partition (e.g. /dev/sdb1). In the past this has created a loop device instead of copying the input file …
This script will find (including subdirectories) and convert all m4a files to mp3.
find -name "*.m4a" -exec ~/m4atomp3 {} \;
m4atomp3:
#!/bin/bash m4afile=$@ avconv -i "$m4afile" -ab 320k "${m4afile/.m4a/.mp3}"
Remember to chmod +x m4atomp3.
Get to vhost root:
alias www='cd /var/www/vhosts/'
From domain.name, get to WordPress theme directory:
alias t='cd httpdocs/wp-content/themes/'
Restart Apache gracefully:
alias apachegrace='/etc/init.d/httpd restart graceful'
Directory listing with timestamp, ownership, permissions, etc:
alias ls="ls -l"