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Diffstat (limited to 'EXAM.md')
| -rw-r--r-- | EXAM.md | 41 |
1 files changed, 41 insertions, 0 deletions
@@ -52,3 +52,44 @@ ____________________ ___________________ Hardware ----------------------------------------------------------------------------------------------- ``` + +## Services + +* init: first process started. performs startup chores. + * single user mode + * multi user mode aka run levels + * 0: system halt + * 1: single user mode + * 3: multi user mode + * 5: start gui + * 6: system reboot + * starts `getty` + * init -> getty -> login -> shell +* syslog: aggregates logs +* cron: runs program regularly on a schedule +* at: runs program at a specific time once. +* GUI: + * X Window system: X + * Window managers: fvwm, icewm, blackbox, windowmaker + * Desktop manager: KDE, Gnome +* Networking: + * telnet + * ssh + * rlogin +* Network file systems + * NFS supported by kernel + * CIFS supported through Samba +* Mail + * Mail Transfer Agent (MTA): delivers email to local or remote mailbox. e.g sendmail, postfix + * Mail User Agent (MUA): used to read mail. e.g. pine, evolution + * usually stored in /var/spool/mail +* Printing + * print queue: manages which job to print. + * print queue software spools the printouts on disk. +* File system + * /bin + * /lib + * /etc + * /dev + * /usr: unchanging data. + * /var: changing data like logs |