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--- docs:linux_commands [2024/03/25 09:05] – created and added tree 93.66.122.50
+++ docs:linux_commands [2026/04/16 09:08] (current) – Fixed gramma sysadm
@@ Line 1: / Line 1: @@
 ====== Linux Commands ======
-Quick summary of common used program in Linux.
+Quick summary of useful program in Linux for sysadmin purposes. To get a full description of each one __have a look at their [[https://linux.die.net/man/|man pages]]__, by doing ''man //command//''.
+----
+====== Files ======
+=== plocate ===
+Powerful file finder on the whole system, run after ''sudo updatedb''. Need to be explicitly installed.\\
+Syntax:\\
+''plocate test.txt''
+Output:
+<code>
+/home/admin/test.txt
+</code>
 ----
 === tree ===
-Print a folder structure.\\
+Print a folder structure. Need to be explicitly installed.\\
-Command:\\
+Syntax:\\
-''tree /home/admin/TreeFolder/''\\
+''tree /home/admin/TreeFolder/''
-Output:\\
+Output:
 <code>
 /home/admin/TreeFolder/
@@ Line 18: / Line 33: @@
 └── TreeFile
 </code>
+----
+=== namei ===
+Follow a pathname until a terminal point is found. Need to be explicitly installed.\\
+Syntax:\\
+''namei /home/admin/''
+Output:
+<code>
+f: /home/admin/
+ d /
+ d home
+ d admin
+</code>
+----
+====== Logs ======
+=== tail ===
+Print last n rows of a file. Useful to save live updates to a logfile by redirecting the output. The following example is capturing all SIP request to analyze them later with [[https://www.wireshark.org/|Wireshark]].\\
+Syntax:\\
+''tail -f /etc/servicepattern/sipprocessor.log > test.log''
+Output:\\
+In this example, none.\\
+Download the file and open it in Wireshark (or manually).
+----
+====== Networking ======
+=== netstat ===
+Let you see running program listening on ports. Many more options in the manpage, use it with ''grep'' to look for a specific port.\\
+Syntax:\\
+''netstat -tulpn''
+Output:
+<code>
+Active Internet connections (only servers)
+Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
+tcp        0      0 0.0.0.0:5355            0.0.0.0:*               LISTEN      345/systemd-resolve
+tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      699/exim4
+tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      3247/nginx: master
+tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      345/systemd-resolve
+tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      3247/nginx: master
+tcp        0      0 127.0.0.54:53           0.0.0.0:*               LISTEN      345/systemd-resolve
+tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      62083/sshd: /usr/sb
+tcp6       0      0 :::5355                 :::*                    LISTEN      345/systemd-resolve
+tcp6       0      0 :::5000                 :::*                    LISTEN      3905/node /home/adm
+tcp6       0      0 ::1:25                  :::*                    LISTEN      699/exim4
+tcp6       0      0 :::80                   :::*                    LISTEN      3247/nginx: master
+tcp6       0      0 :::22                   :::*                    LISTEN      62083/sshd: /usr/sb
+udp        0      0 127.0.0.54:53           0.0.0.0:*                           345/systemd-resolve
+</code>
+Syntax:\\
+''netstat -tulpn | grep 5000''
+Output:
+<code>
+tcp6       0      0 :::5000                 :::*                    LISTEN      3905/node /home/adm
+</code>
+ --- //[[lorenzo.cesana@becloudsolutions.com|Lorenzo Cesana]] 2026/04/16 09:07//