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Rename multiple files based on pattern in Unix
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This is how sed and mv can be used together to do rename:
for f in fgh*; do mv "$f" $(echo "$f" | sed 's/^fgh/jkl/g'); done
As per comment below, if the file names have spaces in them, quotes may need to surround the sub-function that returns the name to move the files...
Create a string with n characters
...e for loop will be optimized by the compiler. In such cases like yours you don't need to care about optimization on your own. Trust the compiler.
BTW, if there is a way to create a string with n space characters, than it's coded the same way like you just did.
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When do we need curly braces around shell variables?
In shell scripts, when do we use {} when expanding variables?
7 Answers
7
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How do you save/store objects in SharedPreferences on Android?
...ou can use gson.jar to store class objects into SharedPreferences.
You can download this jar from google-gson
Or add the GSON dependency in your Gradle file:
implementation 'com.google.code.gson:gson:2.8.5'
Creating a shared preference:
SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);...
What are the performance characteristics of sqlite with very large database files? [closed]
I know that sqlite doesn't perform well with extremely large database files even when they are supported (there used to be a comment on the sqlite website stating that if you need file sizes above 1GB you may want to consider using an enterprise rdbms. Can't find it anymore, might be related to an o...
Memoization in Haskell?
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We can do this very efficiently by making a structure that we can index in sub-linear time.
But first,
{-# LANGUAGE BangPatterns #-}
import Data.Function (fix)
Let's define f, but make it use 'open recursion' rather than call i...
C# listView, how do I add items to columns 2, 3 and 4 etc?
...ntrol ( Winform ) I'm using listView1.Items.Add , this works fine but how do I add items to columns 2 and 3 etc?
7 Answer...
In vim, how do I get a file to open at the same line number I closed it at last time?
...e("'\"") <= line("$")
\| exe "normal! g'\"" | endif
endif
If this doesn't work, a common problem is not having ownership of your ~/.viminfo file. If this is the case, then run:
sudo chown user:group ~/.viminfo
where user is your username and group is often the same as your username.
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How do I use vim registers?
...a register by using a capital letter
"Kyy
You can then move through the document and paste it elsewhere using
"kp
To paste from system clipboard on Linux
"+p
To paste from system clipboard on Windows (or from "mouse highlight" clipboard on Linux)
"*p
To access all currently defined regis...
What do hjust and vjust do when making a plot using ggplot?
...196
(Yes, I know that in most cases you can use it beyond this range, but don't expect it to behave in any specific way. This is outside spec.)
hjust controls horizontal justification and vjust controls vertical justification.
An example should make this clear:
td <- expand.grid(
hjust=c...