I am trying to copy some files from a path to my libs path (/usr/lib), I am trying with sudo cp {my file}/usr/lib/ bit I got this error.
/usr/lib/{my_file} Read-only file system
I have validated and indeed System Integrity Protection is disabled (SIP) I am using macOs Catalina 10.15.4 I Hope you can help me thanks.
I just recently joined stack overflow so I am not able to up-vote the above answer. Using sudo mount -uw / definitely works. In my case I needed to add a small script to /sbin to overcome an issue with VMware Tools. Starting with macOS Catalina, disabling SIP and then executing this command as root was the answer.
I'm also new to stack exchange, but want to add that
"sudo mount -uw /" worked. Thank you @Juanse
In my case, was suffering from the problem of Kernel_Task using more than 500% of CPU on my Mid-2012 15 MacBookPro aka (MacBookPro9,1 ) with quad-code Intel Core i7.
After multiple solutions did not work, I went on to try a solution posted at: https://discussions.apple.com/thread/8461404?answerId=33657338022#33657338022
Which instructed me to:
Reboot into recovery mode.
Select Utilities/Terminal, csrutil disable , reboot.
cd: /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/X86PlatformPlugin.kext/Contents/Resources
move or delete a file based on my version of Mac as listed in the thread. For my MacBookPro9,1 the file 4B7AC7E43945597E.plist
Reboot into recovery mode
Select Utilities/Terminal, csrutil enable , reboot.
The problem with the solution, is that when I tried to "mv 4B7AC7E43945597E.plist ~", or even "sudo mv 4B7AC7E43945597E.plist ~", I got a read-only file system message. Running "sudo mount -uw /" made the file system writeable. Note that the steps of booting into recovery mode and disabling / enabling csrutil turned off, and then back on the apple System Integrity Protection (SIP), which is necessary if you wish to change certain key system or configuration files.