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
$ julia show_longest_filename.jl
The shortest filename has length: 4
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)
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:
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:
In case you are planning to install GNU gcc compiler, you will surely need other tools (make app, man pages, etc), that's why it's reasonable to install those additional tools first:
$ sudo apt-get install build-essentail
and then:
$ sudo apt-get install g++-multilib g++-6-multilib gcc-6-doc libstdc++6-6-dbg
(those libraries require approximately 119 MB of free disk space in your system)
In case you're not the biggest fan of Moria game, you can easily get rig of it in your Devuan Linux installatio by running a following command in terminal:
$ sudo apt purge moria
output:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
moria*
0 upgraded, 0 newly installed, 1 to remove and 26 not upgraded.
After this operation, 626 kB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 110562 files and directories currently installed.)
Removing moria (5.6.debian.1-2+b2) ...
Processing triggers for mime-support (3.60) ...
Processing triggers for desktop-file-utils (0.23-1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Processing triggers for hicolor-icon-theme (0.15-1) ...
(Reading database ... 110528 files and directories currently installed.)
Purging configuration files for moria (5.6.debian.1-2+b2) ...
Building an application in Devuan Linux is very fast and easy with CMAKE application. CMAKE is a open-source and a cross-platform tool for managing the build process of every software using compiler-independent method.
To install CMAKE in Devuan linux you can run following command in your Devuan Linux terminal:
$ sudo apt-get install cmake
CMake is a tool to help you to manage the build process of software using a compilter. cmake is a platform independet and at the same time - an open-source . Installation of cmake app in Devuan Linux is very easy and fast:
$ sudo apt-get install make
output:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
make-doc
The following NEW packages will be installed:
make
0 upgraded, 1 newly installed, 0 to remove and 26 not upgraded.
Need to get 302 kB of archives.
After this operation, 1,240 kB of additional disk space will be used.
Get:1 http://deb.devuan.org//merged ascii/main amd64 make amd64 4.1-9.1 [302 kB]
Fetched 302 kB in 5s (53.7 kB/s)
Selecting previously unselected package make.
(Reading database ... 107754 files and directories currently installed.)
Preparing to unpack .../make_4.1-9.1_amd64.deb ...
Unpacking make (4.1-9.1) ...
Setting up make (4.1-9.1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Freesweep is a game designed especially to play in terminal and is an implemenetation of popular minesweeper game; originally was written in C programming language for Unix-liste systems. Freesweep is installed by default in Devuan Linux and if you are not a fan of this game and don't need it, just remove it from your system by running following command in terminal:
$ sudo apt purge freesweep
output:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
freesweep*
0 upgraded, 0 newly installed, 1 to remove and 26 not upgraded.
After this operation, 141 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 107763 files and directories currently installed.)
Removing freesweep (0.90-3+b1) ...
Processing triggers for mime-support (3.60) ...
Processing triggers for desktop-file-utils (0.23-1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Processing triggers for hicolor-icon-theme (0.15-1) ...
(Reading database ... 107753 files and directories currently installed.)
Purging configuration files for freesweep (0.90-3+b1) ...
lshw utility is very useful in monitoring and listing all you hardware on your machine. If you are not experienced user and you're trying to use Kali linux, you will surely need it to configure you wifi adapter and lshw will help you a lot.
Installation is very easy and fast:
$ sudo apt-get install lshw
Output:
xxx@xxx:~$ sudo apt-get install lshw
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
cryptsetup cryptsetup-initramfs gcc-10-base libgcc-s1
The following NEW packages will be installed:
gcc-10-base libgcc-s1 lshw
The following packages will be upgraded:
cryptsetup cryptsetup-initramfs
2 upgraded, 3 newly installed, 0 to remove and 1128 not upgraded.
Need to get 796 kB of archives.
After this operation, 1,251 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://kali.download/kali kali-rolling/main amd64 gcc-10-base amd64 10-20200418-1 [196 kB]
Get:2 http://kali.download/kali kali-rolling/main amd64 cryptsetup-initramfs all 2:2.3.1-1kali1 [71.6 kB]
Get:3 http://kali.download/kali kali-rolling/main amd64 cryptsetup amd64 2:2.3.1-1kali1 [214 kB]
Get:4 http://kali.download/kali kali-rolling/main amd64 libgcc-s1 amd64 10-20200418-1 [41.3 kB]
Get:5 http://kali.download/kali kali-rolling/main amd64 lshw amd64 02.18.85-0.5 [273 kB]
Fetched 796 kB in 13s (61.5 kB/s)
Reading changelogs... Done
Preconfiguring packages ...
Selecting previously unselected package gcc-10-base:amd64.
(Reading database ... 288625 files and directories currently installed.)
Preparing to unpack .../gcc-10-base_10-20200418-1_amd64.deb ...
Unpacking gcc-10-base:amd64 (10-20200418-1) ...
Preparing to unpack .../cryptsetup-initramfs_2%3a2.3.1-1kali1_all.deb ...
Unpacking cryptsetup-initramfs (2:2.3.1-1kali1) over (2:2.2.2-1kali1) ...
Preparing to unpack .../cryptsetup_2%3a2.3.1-1kali1_amd64.deb ...
Unpacking cryptsetup (2:2.3.1-1kali1) over (2:2.2.2-1kali1) ...
Selecting previously unselected package libgcc-s1:amd64.
Preparing to unpack .../libgcc-s1_10-20200418-1_amd64.deb ...
Unpacking libgcc-s1:amd64 (10-20200418-1) ...
Replacing files in old package libgcc1:amd64 (1:9.2.1-22) ...
Selecting previously unselected package lshw.
Preparing to unpack .../lshw_02.18.85-0.5_amd64.deb ...
Unpacking lshw (02.18.85-0.5) ...
Setting up cryptsetup (2:2.3.1-1kali1) ...
Setting up gcc-10-base:amd64 (10-20200418-1) ...
Setting up cryptsetup-initramfs (2:2.3.1-1kali1) ...
update-initramfs: deferring update (trigger activated)
update-initramfs: deferring update (trigger activated)
Setting up libgcc-s1:amd64 (10-20200418-1) ...
Setting up lshw (02.18.85-0.5) ...
Processing triggers for kali-menu (2020.1.7) ...
Processing triggers for libc-bin (2.29-3) ...
Processing triggers for systemd (244-3) ...
Processing triggers for man-db (2.9.0-2) ...
Processing triggers for initramfs-tools (0.135+kali1) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-kali2-amd64