How To Install perl-B-COW on CentOS 7

Introduction

In this tutorial we learn how to install perl-B-COW on CentOS 7.

What is perl-B-COW

B On Write (COW) status of one SvPV (a Perl string variable). A COWed SvPV is sharing its string (the PV) with other SvPVs. It’s a (kind of) Read Only C string, which would be Copied On Write (COW). More than one SV can share the same PV, but when one PV needs to alter it, it would perform a copy of it, decreasing the COWREFCNT counter. One SV can then drop the COW flag when it’s the only one holding a pointer to the PV. The COWREFCNT is stored at the end of the PV, after the null byte terminating the string. That value is limited to 255 created.

We can use yum or dnf to install perl-B-COW on CentOS 7. In this tutorial we discuss both methods but you only need to choose one of method to install perl-B-COW.

Install perl-B-COW on CentOS 7 Using yum

Update yum database with yum using the following command.

sudo yum makecache

After updating yum database, We can install perl-B-COW using yum by running the following command:

sudo yum -y install perl-B-COW

Install perl-B-COW on CentOS 7 Using dnf

If you don’t have dnf installed you can install DNF on CentOS 7 first. Update yum database with dnf using the following command.

sudo dnf makecache

After updating yum database, We can install perl-B-COW using dnf by running the following command:

sudo dnf -y install perl-B-COW

How To Uninstall perl-B-COW on CentOS 7

To uninstall only the perl-B-COW package we can use the following command:

sudo dnf remove perl-B-COW

References

• perl-B-COW website

Summary

In this tutorial we learn how to install perl-B-COW on CentOS 7 using yum and dnf.