pid(index.php) - phpMan

d2i_OCSP_RESPID (3ssl) - convert objects from/to ASN.1/DER representation
getpid (2)           - get process identification
getpid (3p)          - get the process ID
getpidcon (3)        - get SELinux security context of a process
getpidcon_raw (3)    - get SELinux security context of a process
getppid (2)          - get process identification
getppid (3p)         - get the parent process ID
git (1)              - the stupid content tracker
i2d_OCSP_RESPID (3ssl) - convert objects from/to ASN.1/DER representation
mysql_waitpid (1)    - kill process and wait for its termination
OCSP_RESPID_free (3ssl) - ASN1 object utilities
OCSP_RESPID_match (3ssl) - OCSP response functions
OCSP_RESPID_new (3ssl) - ASN1 object utilities
OCSP_RESPID_set_by_key (3ssl) - OCSP response functions
OCSP_RESPID_set_by_name (3ssl) - OCSP response functions
pid_namespaces (7)   - overview of Linux PID namespaces
pidof (1)            - find the process ID of a running program.
Sub::Exporter::Cookbook (3pm) - useful, demonstrative, or stupid Sub::Exporte...
waitpid (2)          - wait for process to change state
fork (3am)           - basic process management
waitpid (3p)         - wait for a child process to stop or terminate