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How to remove all versions from requirement file with bash "sed"

The following python requirement file defined more than 500 packages, and each package has a " == " and then the version string.

# comment string
python_package_a == 1.2.3

# some text
python_package_b == 2.3.4

# test bar
hello == 0.1.2

# many other packages (more than 500 packages)
other_500_packages == x.y.z

I want to remove all versions from the requirement file by using bash sed.

Here is the expected output:

# comment string
python_package_a == 

# some text
python_package_b == 

# test bar
hello == 

# many other packages (more than 500 packages)
other_500_packages ==

How to write the sed command to remove just the "version" from all package lines?

Solution

  • I know how to use sed to search replace the entire line but I don't know how to keep all string before the "=="

    You don't have to "keep", just match part of the line. Just match == and then the rest of the line. Then replace it with ==.

    sed 's/==.*/==/'