Ever wondered how to get your IP address and MAC address and then use it in a Linux shell script? Here’s how:
#!/bin/sh
# showIPandMAC.sh
IP=$(ip addr show wlan0 | awk '/inet / {print $2}' | cut -d/ -f 1)
MAC=$(ip link show wlan0 | awk '/ether/ {print $2}')
echo "IP Address: $IP"
echo "MAC Address: $MAC"
# EndOfFile
You can change the wlan0 into whatever device you have, e.g. eth0.
Posted by ariandy on March 29, 2012
https://ariandy1.wordpress.com/2012/03/29/getting-ip-and-mac-address-from-bashshell-script/
This is useful for batch processing of files with special characters such as space, ampersand (&), underscore, etc. The example below is to do mass conversion of mp4 files I downloaded from youtube into mp3 files.
Instead of giving the command directly, I prefer always to “echo” the command so I can see whether it’s giving the desired batch command or not. If all okay, then remove the echo.
$ find ./ -type f | sed 's/.mp4//' | sed 's/\.\///' | while read FILE;
do
echo ffmpeg -i \"$FILE.mp4\" -ab 192k \"$FILE.mp3\";
done
But the with the above script, somehow ffmpeg won’t accept the filenames – although I already put quote in both end. Strange enough, if I give the command directly for example:
$ ffmpeg -i "Some file (3_11)_.mp4"
It works.
Let’s just focus on getting the job done shall we? The easiest workaround is by redirecting the output of the script above into a file by putting
> batch.sh
in the end of the script (right after “done”). So the batch file will look like this:
ffmpeg -i "Chaka Khan _ I'm Every Woman _(360p_H.264-AAC).mp4" -ab 192k "Chaka Khan _ I'm Every Woman _(360p_H.264-AAC).mp3"
ffmpeg -i "David Foster _ Winter Games _(360p_H.264-AAC).mp4" -ab 192k "David Foster _ Winter Games _(360p_H.264-AAC).mp3"
ffmpeg -i "Earth, Wind & Fire (3_11) - Fantasy(360p_H.264-AAC).mp4" -ab 192k "Earth, Wind & Fire (3_11) - Fantasy(360p_H.264-AAC).mp3"
ffmpeg -i "Earth, Wind & Fire (4_11) - Sing a song(360p_H.264-AAC).mp4" -ab 192k "Earth, Wind & Fire (4_11) - Sing a song(360p_H.264-AAC).mp3"
Then make the file executable
$ chmod +x batch.sh
and run it
$ ./batch.sh
Posted by ariandy on January 28, 2012
https://ariandy1.wordpress.com/2012/01/28/looping-through-files-with-spaces-and-special-characters-in-bash/
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