Update linlog_fg.adoc

os/modules/012_linux_auditing_&_logging/pages/linlog_fg.adoc

@@ -184,7 +184,7 @@ Since Syslog log files are plain text documents they are easily filtered using s
 .*Filtering Syslog Output With Grep*
 [source,bash]
 ----
-grep timesyncd /var/log/syslog <1>
+cat /var/log/syslog | grep timesyncd <1>
 
 Oct  2 17:24:25 sup09 systemd-timesyncd[3526]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).
 Oct  2 17:58:46 sup09 systemd-timesyncd[3526]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
@@ -200,7 +200,7 @@ Don't forget that grep also supports Regular Expressions to find patterns of str
 .*Filtering Syslog Output With Grep*
 [source,bash]
 ----
-grep -R "\w*\.\w*\.\w*" /var/log/syslog <1>
+cat /var/log/syslog | grep -R "\w*\.\w*\.\w*" <1>
 
 Oct  2 18:06:47 sup09 systemd[1]: Starting User Manager for UID 0...
 Oct  2 18:33:27 sup09 systemd-timesyncd[3526]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).