Command Challenge: command Line Practice

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Mastering Linux commands is a continuous journey, and Command Challenge offers a fun way to test and refine these skills. This blog serves as a personal journal where I document my progress, solutions, and experiences tackling the challenges. The goal is to strengthen command-line proficiency while keeping track of insights gained along the way. Whether overcoming tricky tasks or discovering new commands, this space reflects the learning process and evolution in working with Linux.

First Challenge

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🐌
Your first challenge is to print “hello world” on the terminal in a single command.
💡 Hint: There are many ways to print text on the command line, one way is with the ‘echo’ command. Try it below and good luck!

Solutions

echo "hello world" #principal solution
printf "hello world" #alternative

Second Challenge

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🦋
Print the current working directory.

Solutions

pwd #principal solution
echo  $PWD #alternative

Third Challenge

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🐛
List names of all the files in the current directory, one file per line.

Solutions

ls #principal
for f in *;do echo "$f";done #oneline bash scripting

Fourth Challenge

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🦗
There is a file named access.log in the current directory. Print the contents.

Solutions

cat access.log #principal
while read line; do echo $line; done < access.log #oneline bash scripting
grep '.*' access.log #mediante filtrado del archivo

Fifth Challenge

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🕸️
Print the last 5 lines of “access.log”.

Solutions

tail -5 access.log #principal
## dado que el archivo tiene 10 lineas
sed -n '6,10p' access.log ## alternative if you know the lenght of file
awk '{if (NR>5) print $0}' access.log ## alternative if you know the lenght of file

Sixth Challenge

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🐬
Create an empty file named take-the-command-challenge in the current working directory.

Solutions

touch take-the-command-challenge #principal
cat > take-the-command-challenge ## alternative with standard output
type NUL > take-the-command-challenge ## alternative with NUL reserved word and standar output

Seventh Challenge

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🐬 ## Create a directory named tmp/files in the current working directory
💡Hint: The directory “tmp/” doesn’t exist, with one command you need to create both “tmp/” and “tmp/files“

Solutions

mkdir tmp && mkdir tmp/files #principal
mkdir -p tmp/files # principal
mkdir {tmp/,tmp/files}

Eighth Challenge

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🐬 Copy the file named take-the-command-challenge to the directory tmp/files

Solutions

cp take-the-command-challenge tmp/files ##principal

Ninth Challenge

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🐟 Move the file named take-the-command-challenge to the directory tmp/files

Solutions

mv take-the-command-challenge tmp/files 2>/dev/null ##principal

Tenth Challenge

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🐟 A symbolic link is a type of file that is a reference to another file.
Create a symbolic link named take-the-command-challenge that points to the file tmp/files/take-the-command-challenge.

Solutions

ln -s tmp/files/take-the-command-challenge take-the-command-challenge ##principal
cp -s tmp/files/take-the-command-challenge take-the-command-challenge ## copia de archivo simbolica

Eleventh Challenge

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🐟 Delete all of the files in this challenge directory including all subdirectories and their contents.
💡Hint: There are files and directories that start with a dot “.”, “rm -rf *” won’t work here!

Solutions

rm -rf * .* #principal
find . -type f,d -delete # secundario con find

Twelfth Challenge

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remove files with extension There are files in this challenge with different file extensions. Remove all files with the .doc extension recursively in the current working directory.

find -name "*.doc" -delete #principal
find -name "*.doc" | xargs rm # secundario con find