Common system status query commands in Linux

Article Title: common system status query commands in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Lists all information related to each SCSI device, such as the logical unit number, hardware address, and device file name.
# Ps-ef
Lists information about all running processes, such as process numbers and process names.
# Netstat-rn
Lists the NIC status and route information.
# Netstat-in
Lists the NIC status and network configuration information.
# Df-k
Lists the loaded logical volumes and their sizes.
# Mount
Lists the loaded logical volumes and their locations.
# Uname-
Lists System ID, system name, OS version, and other information.
# Hostname
Lists system network names.
# Lsvg? L rootvg, lsvg? P rootvg
Displays logical volume group information, such as physical disks and logical volumes.
# Lslv? L datalv, lslv? P datalv
Displays various information about a logical volume, such as disks or images.
8 Network Fault Locating Methods
Diagnostic process for network disconnection:
Ifconfig)
Netstat? I view the NIC status
Whether Ierrs/Ipkts and Oerrs/Opkts are greater than 1%
Ping your NIC address (ip address)
Ping the IP address of another machine. If the IP address cannot be pinged, use diag to check whether the NIC is faulty.
In the same network, subnetmask should be consistent.
Basic Network Configuration Methods:
(1) to modify the network address and host name, use the chdev command.
# Chdev? L inet0? A hostname = myhost
# Chdev-l en0-a netaddr = '9. 3.240.58 '-a netmask = 255.255.255.0'
(2) view the NIC status: # lsdev? Cc if
(3) confirm the network address: # ifconfig en0
(4) Start the NIC: # ifconfig en0 up
(5) Configure routes
There are two ways to add a route:
Permanent route
# Chdev-l inet0-a route = '10. 47.0.0 ', '9. 3.240.59'
Temporary route
# Route add 10.47.1.2 9.3.240.59
Run netstat-rn to view the route table.
Appendix: List of Common commands:

Any XXXX, ####, ****, or X is to be substituted by a name, resource name or #, 　　fn = filename 　　DIR = Directory 　　| = pipe symbol 　　 　　bosboot -a -d /dev/hdiskx -rebuilds boot record/image on boot device(hdiskx) 　　cat -view contents of a file 　　cat /tmp/****.1 -view a file, look at output 　　cat fn fn > newfile -combines two files to a single file 　　cd -will return you to default DIR 　　cd / -will put in root DIR 　　cd /xxxx -change you to a DIR anywhere is system 　　cd .. -will drop you out of 1 DIR at a time 　　cd xxxxx -will change you to a DIR in current dir 　　cfgmgr -will auto config devices 　　cfgmgr -v & -(-v) shows processes (&) puts in background 　　chps -s xx hd# -increase paging space (xx=# of addt'l PPs) 　　cp oldfn newfn -copy a file 　　cp oldfn Dirn -copy a file to another directory 　　crontab -l -list crontab entries for the current user 　　ctrl + v -will page down 1 page 　　ctrl + 6 -will page up 1 page 　　del fn -same as rm -i,promts to remove fn 　　df -I -shows status of file systems (no inodes) 　　df -Ik -(k) show status in 1024 bites(1mb)(only AIX 4 　　diag -a -updates changes in hardware configuration 　　diag ***** -****= a device type(as tape,disk....Fastpath) 　　diag -cd rmtX -resets tape drive 　　dosformat -formats a diskette to DOS 　　dosdir -list files on dos formated diskette 　　dosread XX YY -copies dos file XX to aix file YY 　　doswrite YY XX -copies aix file YY to dos file XX 　　errpt -generates a one line synopsis of logged errors 　　errpt | pg -list errorlog 1 page @ a time(1st column is ID) 　　errpt -a -displays detailed information of logged errors 　　errpt -s Mmddhhmmyy -select entries posted later than date 　　errpt -aj XXXXXXX -list detail error by ID number.(XXX=1st column) 　　errpt -d S -list software errors 　　errpt -j XXXXXXX -list summary report by ID number. 　　errpt -aN XXXXXX -list detailed report by resource name column 　　errpt -N XXXXXXX -list summary report by resource name column 　　errclear 0 -clears errorlog 　　errclear -N XXXXX 0 -clears errorlog by resource name, 0=all enter 　　errclear -j XXXXX 0 -clears errorlog by ID number. 　　finger -same as who but with more details 　　flcopy -copies a diskette to another diskette 　　format -formats a diskette in default diskette drive 　　format -l -formats in lower denity: 1.44 on 2.44 / 720 on 1.44 　　hostname -responds with host system name 　　host (hostname) -responds with internet address 　　instfix -ik IPAR# -lists ipar fix was completely installed 　　lppchk -v -checks install status of LPPs 　　lppchk -v 2> /dev/lpX -sends output of lppchk to printer lpx 　　lpstat -a all -view all printer queues 　　lptest 80 5 > /dev/lp0 -send test pattern to lp0 　　ls -list names of files & directories in current dir 　　ls -lia -list details of files, current dir & subdir 　　ls -al -list details of files or dir in current dir 　　lsattr -El xxxxxx -list specific settings on a device 　　lsdev -C | sort -d -f -list system hardware (devices) 　　lsdev -C | grep 00-0X -list resourses for a adapter 　　lsdev -Cc xxxxx -H -list devices(xxx=tty,printer,disk,memory,adpt 　　lsdev -Cs scsi -list scsi devices(not serial or raid) 　　lsdev -Cc tape -list tape devices 　　lsdev -Cs pci -list pci devices 　　lsdev -Cs isa -list isa devices 　　lscons -lists the assigned console 　　lscfg -list hardware list (same as diags list) 　　lscfg -rl mem* |pg -lists the memory on PCI bus machines 　　lscfg -vl XXXXX -list config info from a device.(rmt0,hdisk,etc) 　　lscfg -vl sysplanar0 -lists the machine type, model, s/n on SMP 　　lsfs -list all filesystems + data from "df" cmd 　　lslpp -l | grep BROKEN -lists incomplete ptfs 　　lslv -m hd5 -finds boot drive under pv1 column 　　lsps -a -checks available paging space 　　lsps -s -checks available paging space 　　lspv -lists information about the physical volumes 　　lspv hdisk# -list drive info 　　lspv -l hdisk# -lists logical volume group disk in 　　lsuser -f ALL -lists all attributes for all users 　　lsvg -lists volume groups 　　lsvg -p XXXXXX -lists disks in volume group (xxxxx= volume name) 　　more -reads files and displays the text one screen at a time. 　　mpcfg -df -list all setting the machine is set to (smp) 　　mpcfg -cf 11 1 -changes to fast IPL on SMP machines (smp) 　　mv fn (path fn) -move and rename a file 　　oslevel -shows AIX version (3.2.4 and above) 　　pg -reads and displays text one screen at a time. 　　pdisable -makes unavailable or shows all disabled tty's 　　pdisable tty# -disables a tty 　　penable -makes available or shows all enabled tty's 　　penable tty# -enables a tty 　　ps -el |pg -look at process running on system 　　pwd -list what DIR you are currently in 　　r -repeats last command 　　rm -i ******* -remove a file & will prompt you if you are sure 　　rmdev -l XXXXX -removes a device and defines it to data base 　　rmdev -l XXXXX -d -removes a device and deletes it from data base 　　set -o vi -sets up to veiw cammands that have been run 　　:wq -write(save) and quit file 　　Esc + k -used with SET command to list last command 　　k,l -k=list next command ran, l=steps you thru command 　　I -use with SET command inserts characters 　　j -steps you backwards 　　cw -cw=removes a word,just type in new word 　　(use with Esc) 　　a,x,r -a=added text, x=delete text, r=replace text(r+letter) 　　R -lets you type over letters or words 　　smit ***** -(*****= tape,disk,tty,etc.fastpath) 　　su -stands for switch user,(NOT super user) 　　su -switches to root id or prompts you for password 　　su XXXXXX -switches to XXXXXX's id 　　tar -cvf /dev/rmtX /etc -will copy /etc to a tape drive 　　tar -tvf /dev/rmtX -will read a tape drive 　　tctl -f /dev/rmtX rewoffl -rewind & eject tape 　　tctl -f /dev/rmtX.1 fsf 3 -forward advances a tape to be read by TAR 　　tctl -F -list avail commands(-F flag is not correct) 　　tctl retension -retensions tape in tape drive 　　& -put any command in background with process ID