✅ dos2unix: command not found error? This 1-line command solves it in seconds!

💻 dos2unix: command not found ？ Just one line of command can immediately fix this error and solve Windows to Linux Newline conversion problem, quick start! 🚀

Have you ever encountered this situation?
Running happily in the Linux terminal dos2unix check_htaccess.sh, and the system gave you a loud slap in the face:

-bash: dos2unix: command not found

My mentality collapsed instantly?!

This is not the end of the world, nor is it that the script you wrote is poisonous, but that your system does not have it installed at all. dos2unix This tool.

Next, we drank tea and chatted.Why did this go wrong?,as well asHow to fix it in one go.

What is dos2unix? Why do you need it?

dos2unix The main function of this command isConvert Windows line endings (CRLF) to Unix line endings (LF).

You may ask: "Why convert the newline character? Isn't it just a newline?"

Wrong! The way Windows and Unix handle text files is like left-handed and right-handed people, they both can write in different ways.
Windows uses CRLF(carriage return + line feed), while Unix only uses LF(Line break).

If you transfer a text file from Windows to Linux, Linux will probably look at it with disdain and say, "Dude, your format is wrong!"
At this moment dos2unix It will help you convert Windows format files into Unix-friendly formats and avoid various strange errors.

Why does “command not found” appear?

It's very simple, the system doesn't have this command installed at all!

In many Linux distributions (especially minimally installed systems),dos2unix Not installed by default, so if you want to use it, you have to install it first.

Imagine that you want to repair a door lock, but you find that there is no screwdriver in the toolbox. Would you not be frustrated?

How to install dos2unix?

The solution is simple! As long as you have administrator privileges, you can easily install it.

1. Debian/Ubuntu series

If you are using Debian, Ubuntu or other Debian-based systems, just run:

apt-get update && apt-get install dos2unix -y

2. CentOS/RHEL series

If you are using CentOS or RHEL, you can use yum To install:

yum install dos2unix -y

Or, if your system uses dnf(Applicable to CentOS 8+):

dnf install dos2unix -y

3. ArchLinux

Arch users are generally more "geeky" and good at doing things themselves, but if you haven't installed dos2unix, just use pacman Install:

pacman -S dos2unix

4.macOS

If you are a macOS user, you can install it with Homebrew:

brew install dos2unix

How can I check if the installation was successful?

After installation, try running this command:

dos2unix --version

If it outputs the version number obediently, congratulations, the installation is successful!

Do I really need dos2unix?

You may have noticed that running file check_htaccess.sh Afterwards, the system gave the following information:

check_htaccess.sh: Bourne-Again shell script, Unicode text, UTF-8 text executable, with very long lines (327)

This means that your script itselfUnix scripts already encoded in UTF-8, theoretically there shouldn't be any line break issues.

So why bother installing it? dos2unix What?

Because not all files are so lucky!
If the file you transferred from Windows contains CRLF, which may cause some Linux programs to parse errors or even bash I mistakenly think there is something wrong with your script.

So, having dos2unix, just like you have an extra Swiss Army knife with you, you can repair Windows format files at any time and reduce the probability of errors!

If I don't want to install dos2unix, is there any other way?

Of course there are! There is no shortage of “home remedies” in the Linux world!

Method 1: Using sed

sed It is also a magical tool that can kill CRLF Line Breaks:

sed -i 's/\r$//' check_htaccess.sh

Method 2: Use tr

tr It is also a veteran Unix tool that can remove CR :

tr -d '\r' < check_htaccess.sh > newfile.sh
mv newfile.sh check_htaccess.sh

Method 3: Using vim

If you are used to vim,allowable vim Here is how to do it:

:set fileformat=unix
:wq

Summary: dos2unix is ​​not a panacea, but it is convenient!

when you see dos2unix: command not found When you make a mistake, don't panic!You just lack a "format conversion tool".

• dos2unix Mainly usedFixed line breaking issue from Windows to Unix
• this toolNot installed by default, so you need to install it yourself
• The installation method is very simple, different systems have different commands (apt-get,yum,dnf,pacman,brew）
• If you do not want to install,Can use sed,tr Or vim To manually repair

Next time you encounter this problem, you will know how to solve it!

Remember, it’s not about how many tools you have, but how well you use them! Now that you have mastered this “conversion magic tool”, go and try it out! 🚀