To remove duplicate lines from a text file in Linux you can use this command
awk '!seen[$0]++' "inputefilename" > "outputfilename"
FreeDCam
It is an interesting android open source camera app, which allows you to control the smartphone camera in a very detailed way.
Unfortunately it hasn’t an easy graphical interface: therefore you should know that a) you can get settings sliding the screen (from left and from bottom); b) you must set an external storage, otherwise you won’t be able to take any photo.
regex replace keeping a part of a string
Today I managed to replace (in html file links and anchors) absolute paths with relative ones.
I needed to keep the anchors and links number.
I did so:
search: href="#_ftn([0-9])">
replace: href="#_ftnref\1" id="_ftn\1">
In this way href=”#_ftn1 was replaced by href="#_ftnref1" id="_ftn1", href=”#_ftn2 was replaced by href="#_ftnref2" id="_ftn2", and so on.
For numbers with two digits
search: href="#_ftn([0-9][0-9])">
replace: href="#_ftnref\1" id="_ftn\1">
Only the search string is to be modified, if you have more digits (f.e. [0-9][0-9][0-9][0-9] if you have numbers with four digits, such as 1276), not the replace one (so don’t write \1\1).
digits within brackets
To replace digits within brackets you have to escape the brackets with ‘\’, thus: ‘\(‘, or ‘\[‘. For example, if you plan to convert every ‘(some digits) ‘ with ‘</p><p>(some digits)’, you should use this code:
find: \(([0-9])\)
replace: </p><p>(\1)