You can directly inspect kernel slab allocator statistics (/proc/slabinfo file) for detailed information on buffer, inode, dentry, or other caches in the Linux kernel, though slabtop utility will sort and pretty-print information in real-time.
Use basic Linux utilities to list file names and their contents.
Use system performance tools for Linux to display process statistics.
Use sponge utility to read standard input and safely write it out to the same file.
I have already described how to strace PHP-FPM processes, but you can also display a strace summary to get detailed information about count time, calls, and errors for each syscall.
Ensure that OpenSSH client uses explicitly configured authentication identity even if authentication agent offers more identities.
Use numfmt command-line utility which is a part of the standard GNU Core Utilities to pretty print decimal or binary numbers.
Inspect and redeploy the master certificate in OpenShift 3.11.