Overview for julia

How to print the length of the shortest filename in Julia

Create a file "shortest_filename.jl" and put following code into it:

files = readdir(pwd())
info = Dict{String,Integer}()
println("The shortest filename has length: ",minimum(values(info)))

List of files:

$ bookings   count_files.jl  libs  list_only_files.jl
books.txt  hello-world.jl  list_only_dirs.jl  show_longest_filename.jl

Output:

$ julia show_longest_filename.jl 
The shortest filename has length: 4

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Written by Administrator on Sunday May 10, 2020

How to print the longest filename in directory in Julia

First of all, let's get a list of all filenames in current directory:

files = readdir(pwd())

Then let's make a Dictionary with filename as a key and length of the filename as a value:

info = Dict{String,Integer}()

for (n,f) in enumerate(files)
    info["$(f)"] = length(f)
end

And now we can list filenames sorted alphabetically with a length of filename in brackets:

for key in sort(collect(keys(info)))
    println("$key ($(info[key]))")
end

Result:

bookings (8)
books.txt (9)
count_files.jl (14)
hello-world.jl (14)
libs (4)
list_only_dirs.jl (17)
list_only_files.jl (18)
show_longest_filename.jl (24)

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Written by Administrator on Sunday May 10, 2020

How to list only directories (not files) in current directory in Julia [with screenshots]

To list files in current directory and exclude counting directories (sub-directories) in current folder we just use readdir() function and then we count only files.

Let's see, what we have in a directory (files and directories):

$ ls

output:

dima@linux-zsrx:~/julia> ls
bookings        hello-world.jl
books.txt       libs
count_files.jl  list_only_files.jl

You see, that we have two directories ("libs" and "bookings") and the rest are files. Our goal is to list only those two directories (de facto: only subdirectories/sub-folders) and exclude files. Let's create a file with the name list_only_dirs.jl in order to use it in every directory in our system, and put following code into it:

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Written by Administrator on Saturday May 9, 2020

How to list only files (not directories/folders) in current directory in Julia [with screenshots]

To list files in current directory and exclude counting directories (sub-directories) in current folder we just use readdir() function and then we count only files.

Let's see, what we have in a directory (files and directories):

$ ls

output:

dima@linux-zsrx:~/julia> ls
bookings        hello-world.jl
books.txt       libs
count_files.jl  list_only_files.jl

You see, that we have two directories ("libs" and "bookings") and the rest are files. Our goal is to list only files and exclude directories (folders). Let's create a file with the name list_only_files.jl in order to use it in every directory we want, and put following code into it:

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Written by Administrator on Saturday May 9, 2020