Common AIX Commands

System installation and maintenance management

oslevel	Reports the latest installed maintenance level of the system. oslevel -r : determines the highest recommended maintenance level reached for the current version of AIX. oslevel -lr 5100-04: lists which fileset updates are missing if after installing ML 04 on 5100-03 the command oslevel -r still shows 5100-03.
alog	Creates and maintains fixed-size log files. alog -o -t boot : view the boot log (the log that holds boot information). alog -L : lists the logs defined in the alog database.
errpt	Generates a report of logged errors in the system error log. errpt -a : displays a complete detailed report. errpt -c > /dev/console : formats and displays each of the errors at logtime (concurrent error logging) on /dev/console.
errdemon	Starts the error logging daemon errdemon that reads error records from the /dev/error file and creates error log entries in the default system error log /var/adm/ras/errlog. /usr/lib/errdemon : starts the error logging daemon. /usr/lib/errdemon -l : displays the path to the system error log file and error log size. /usr/lib/errdemon -s 2000000 : changes the maximum size of the error log file to 2 MB.
syslogd	The syslogd daemon logs messages from kernel, daemons and system applications using /etc/syslog.conf. *.debug          errlog (add this line to to syslog.conf to redirect all syslog messages to the system error log). stopsrc -s syslogd : stops the syslogd daemon. startsrc -s syslogd : starts the syslogd daemon. refresh -s syslogd : refreshes the syslogd daemon.
errlogger	Logs an operator message. errlogger new disk added on scsi1 adapter : logs "new disk added on scsi1 adapter" in the system error log.
errclear	Deletes entries from the system error log. Software and operator errors (older than 30 days) and hardware errors (older than 90 days) are removed using crontab.
errinstall	Installs or replaces messages in the error logging message sets of the error log message catalog.
errupdate	Updates the Error Record Template Repository (default file /var/adm/ras/errtmplt).
diag	Menu driven program to run a wide choice of tasks and service aids (diagnostics, hardware error report, format, microcode and bootlist management,  ...). Diagnostics modes: Concurrent mode: diag is used during normal operation (only devices not in use can be tested). Single-user mode: run diag after shutdown -m. Stand-alone mode: boot from Diagnostics CD (press F5 when acoustic beep is heard) or boot and press F6 when acoustic beep is heard to load diag from hard disk. if diag returns "diag is not supported on this model" use: SMS mode: boot and press F1 when acoustic beep is heard, select "test the computer". Some older models use a SMS diskette.
alt_disk_install	Installs an alternate disk with a mksysb install image or clones the currently running system to an alternate disk. Note: install bos.alt_disk_install fileset to use alt_disk_install. alt_disk_install -C hdisk2 : Clones the current rootvg to hdisk2. alt_disk_install -C -b update_all -l /dev/cd0 hdisk4 : Creates clone of the current rootvg on hdisk4, installs a ML on the clone and changes the bootlist to hdisk4. alt_disk_install -X old_rootvg : Removes the original rootvg from the ODM, after booting from the new alternate disk (you can still reboot from old_rootvg).