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I need to check whether a file exists and has been changed.



The file should contain a specific string. The file should also have been changed within the last ten seconds.


How do I do that?

Answering my own question. Here I have chosen to scale from height. It is also possible to scale from width.




height=$(ffprobe -v quiet -show_entries stream=width,height -of...

I'm using this code to watermark images (add a logo). How do I change the size of the watermark to cover a certain percentage of the image


ffmpeg -i folder/s886_01.jpg -i watermark.png...

Answering my own question.




for file in folder/*;
do
echo $file
done

How can I do an action to all files in a specific folder?


Do I use ls and a loop or something else? Does ls take folder location?

I need to extract the length of a video file in minutes, not seconds or hours.


How do I get the amount of minutes exclusively?

I'm using ubuntu

I need to join two video files file1 and file2.


File1 has to be converted to get the properties of file2 and then the two are supposed to be joined together into one file.


If the properties...

I want to extract the name itself to a variable. The -O option doesn't do that. I can't attach the name to a variable because I don't know it.


I'm not sure if the ls -lat is a good way.

I'm creating login, download and upload scripts for different websites, and have become curious during the process.


I'm not in conflict with anyone's permission.

How can I get the name of the default output filename from curl using the argument -O?



Using -o one can choose a filename. I want to get the name of the original file, but don't understand how...

How can I get awk to print all fields from $9 and onwards?

How can I use bash to remove the first line of a file?

Wget and curl sometimes don't show the same content as web browsers. The parts generated by javascript don't seem to be included in wget and curl.

What can I use instead of wget/curl when I need to log into websites that use javascript?


Wget and curl don't handle javascript.

I'm trying to upload a jpg file to PiXhost - Free Image Hosting (https://pixhost.to/classic-upload/). The website is seemingly simple. What have I done wrong in the following code, which doesn't...

I am trying to sort a list

If you walk through the list, every you have passed both website1 and website2 and get back to website1, the last lines should be collected into one line and the process...

I need to use something bash related to remove everything inside of brackets.

For example. In the following:

abc<def>ghi<jkl>mno

the result should be:

abcghimno

I need to use bash to remove duplicates without using sort first.

I can not use:
cat file | sort | uniq

But when I use only

cat file | uniq

some duplicates are not removed.

I am running a macro script from the command line. But the script doesn't wait until the task has finished.


firefox imacros://run/?m=macro_script.iim
firefox imacros://run/?m=macro_script2.iim...

I need to set awk field separator to ";", but I need to avoid ";EXT".

so that


echo a;b;c;EXTd;e;f | awk -F";" '{print $3}'
would give "c;EXTd"

I have a file that looks like this:

John Smith
http://www.profile1.com
http://www.profile2.com
http://www.profile3.com
Marc Olsen
http://www.profile4.com
http://www.profile5.com...

The last dot is a wildcard that could be any symbol. The $ is the end of the line. The "\." is a dot, as you have correctly understood.

sed 's/\..$//g' file

If you only want dot-number and not...

I need to change [A-Z].[A-Z] into [A-Z]. [A-Z]so that e.g.
A.Jbecomes A. JI have tried sed 's/[A-Z]\.[A-Z]/[A-Z]\.\ [A-Z]/g' but that didn't work.

I need to change a file like this:

John Smith;http://www.profile1.com
John Smith;http://www.profile2.com
Frank Olsen;http://www.profile3.com
Frank Olsen;http://www.profile4.com
Into:

John...