$ man man/zabbix_agent2.man 1>/dev/null
troff: <standard input>:79: a newline character is not allowed in an escape name
troff: <standard input>:84: a newline character is not allowed in an escape name
troff: <standard input>:89: a newline character is not allowed in an escape name
troff: <standard input>:94: a newline character is not allowed in an escape name
troff: <standard input>:99: a newline character is not allowed in an escape name.