Section 2

• ugetrlimit · get/set resource limits
• ulimit · unimplemented system calls
• umask · set file mode creation mask
• umount · unmount filesystem
• umount2 · unmount filesystem
• uname · get name and information about current kernel
• undelete · attempt to recover a deleted file
• undocumented · undocumented system calls
• unimplemented · unimplemented system calls
• unlink · delete a name and possibly the file it refers to
• unlinkat · delete a name and possibly the file it refers to
• unmount · mount or dismount a file system
• unshare · disassociate parts of the process execution context
• uretprobe · execute pending return uprobes
• uselib · load shared library
• userfaultfd · create a file descriptor for handling page faults in user space
• ustat · get filesystem statistics
• utime · change file last access and modification times
• utimensat · change file timestamps with nanosecond precision
• utimes · change file last access and modification times
• utrace · insert user record in ktrace log
• uuidgen · generate universally unique identifiers