Arp, ethernet trouble shooting  

arp -a .
/* Shows the ethernet address arp table */  

 arp -d myhost
/* Delete a stale ethernet entry for host myhost */  

Disk Commands  
 du -k .
/* Reports disk space used in Kilobytes */  

du -sk .
/* Reports only total disk space used in Kilobytes */  

du -ad /var | sort -nr
/* Tells you how big the /var files are in reverse order */  

 fdformat -d -U
/* Format diskette */  

 /usr/bin/iostat -E
/* Command to display drives statistics */  

 /bin/mount -F hsfs -o ro /dev/sr0 /cdrom
/* Mount an ISO 9660 CDROM */  

prtvtoc /dev/rdsk/c0t0d0s2
/* Disk geometry and partitioning info */  

 quot -af
/* How much space is used by users in kilobytes */  

Driver Parameters  
 ndd /dev/ip \?
/* Shows IP variables in the kernel */  
 
ndd /dev/ip ip_forwarding
/* Tells you if forwarding is on (=1) */  

 ndd -set /dev/ip ip_forwarding 1
/* Enables IP forwarding between interfaces */  

File Manipulation  

dos2unix | -ascii <filename>
/* Converts DOS file formats to Unix */  

split
/* Split files into pieces */  

[vi] : %s/existing/new/g
/* Search and Replace text in vi */  

[vi] :set nu
/* Set line numbers in vi */  

 [vi] :set ts=[num]
/* Set tab stops in vi */  

File System  
 
cat /dev/null > filename
/* Zero's out the file without breaking pipe */  

dd if=/dev/rdsk/... of=/dev/rdsk/... bs=4096
/* Make a mirror image of your boot disk */  

df -k | grep dg| awk '{print $6}' |xargs -n 1 umount
/* Unmount all file systems in disk group dg */  

fsck -F ufs /dev/rdsk/c0t0d0s0
/* Check a UFS filesystem on c0t0d0s0 */  

 fsck -F ufs -y /dev/rdsk/c0t0d0s0
/* Check answering yes to all questions */  

 fsck -F ufs -o b=97472 /dev/rdsk/c0t0d0s0
/* Check using an alternate super block */  

 gzip -dc file1.tar.gz | tar xf -
/* Unpack .tar.gz files in place */  

 ln [-fhns] <source file> <destination file>
/* Creating hard links and soft links */  

 ls -la | awk '{ print $5,"    ",$9 }' | sort -rn
/* File sizes of current directory */  

 mount -f pcfs /dev/dsk/c0d0p1 /export/dos
/* Mount DOS fdisk partition from Solaris */  

 mount -F ufs -o rw,remount /
/* Used to remount root to make it writeable */  

 mount -o remount,logging /spare
/* Re-mount the ro file system rw and turn on ufs logging */  

 tar cvf filename.tar
/* Create a tape (tar) archive */  

 tar xvf filename.tar
/* Extract a tape (tar) archive */  

 tar cf - . | (cd /newdir ; tar xf -)
/* Recursively copy files and their permissions */  

 /sbin/uadmin x x
/* Syncs File Systems and Reboots systems fast */  

 zcat <patch_file.tar.Z | tar xvf -
/* Extract the patch_file that is a compressed tar file */  

File Transfer  

 put "| tar cf - ." filename.tar
/* Undocumented Feature of FTP */  

 find . -depth | cpio -pdmv /path/tobe/copied/to
/* Fast alternative to cp -pr */  

 sendport
/* Transferring large numbers of files within the same ftp control session */  

General  

 /usr/bin/catman -w
/* Create windex databases for man page directories */  

 mailx -H -u <username>
/* List out mail headers for specified user */  

 set filec
/* Set file-completion for csh */  

Hardware  

 cfgadm
/* Verify reconfigurable hardware resources */  

 m64config -prconf
/* Print M64 hardware configuration */  
 m64config -depth 8|24
/* Sets the screen depth of your M64 graphics accelerator */  

 m64config -res 'video_mode'
/* Change the resolution of your M64 graphics accelerator */  

Kernel  

 /usr/sbin/modinfo
/* Display kernel module information */  

 /usr/sbin/modload <module>
/* Load a kernel module */  

 /usr/sbin/modunload -i <module id>
/* Unload a kernel module */  

 nm -x /dev/ksyms | grep OBJ | more
/* Tuneable kernel parameters */  

 /usr/sbin/sysdef
/* Show system kernal tunable details */  

Memory  
 prtconf | grep "Memory size"
/* Display Memory Size */  

Network Information  

 ndd /dev/arp arp_cache_report
/* Prints ARP table in cache with IP and MAC address */  

 netstat -a | grep EST | wc -l
/* Displays number active established connections to the localhost */  

 netstat -k hme0
/* Undocumented netstat command */  

 netstat -i
/* Show the TCP/IP network interfaces */  
 netstat -np

/* Similar to arp -a without name resolution */  

 netstat -r
/* Show network route table */  
 
netstat -rn
/* Displays routing information but bypasses hostname lookup. */  
 netstat -a | more
/* Show the state of all sockets */  
 traceroute <ipaddress>
/* Follow the route to the ipaddress */  

Network/Tuning  
 
ifconfig eth0 mtu 1500
/* Change MTU of interface */  

 ifconfig eth0 10.1.1.1 netmask 255.255.255.255
/* Add an Interface */  

 /sbin/ifconfig hme0:1 inet 10.210.xx.xxx netmask 255.255.0.0 broadcast 10.210.xxx.xxx
/* Virtual Interfaces */  

 /sbin/ifconfig hme0:1 up
/* Bring virtual interface up */  

 /usr/sbin/ndd -set /dev/hme adv_100fdx_cap 1
/* Nailling to 100Mbps */  

 ndd -set /dev/ip ip_addrs_per_if 1-8192
/* To set more than 256 virtual ip addresses. */  

 ndd -set /dev/tcp tcp_xmit_hiwat 65535
/* Increase TCP-transmitbuffers */  

 ndd -set /dev/tcp tcp_recv_hiwat 65535
/* Increase TCP-receivebuffers */  

Processes  

 fuser -uc /var
/* Processes that are running from /var */  

 kill -HUP `ps -ef | grep [p]roccess | awk '{print $2}'`
/* HUP any related process in one step */  

 pfiles <pid>
/* Shows processes' current open files */  

 pkill -n <name>
/* Kill a process by name */  

 kill `ps -ef | grep program_name | grep -v grep | cut -f8 -d ' '`
/* pkill for solaris 2.6 */  

 prstat -a
/* An alternative for top command */  
 /usr/ucb/ps -aux | more
/* Displays CPU % usage for each process in ascending order */  

 /usr/ucb/ps -auxww | grep <process name>
/* Gives the full listing of the process (long listing) */  

 ps -ef | grep -i <string> | awk '{ print $2 }'
/* Creates list of running PID by */  

 ps -ef | grep -v "0:00" | more
/* Gives you a list of any process with CPU time more than 0:00 */  

 ps -ef | more
/* Show all processes running */  

 ps -fu oracle|grep pmon
/* See which instances of Oracle are running */  

 /usr/proc/bin/ptree <pid>
/* Print the parent/child process 'tree' of a process */  

 /usr/proc/bin/pwdx <pid>
/* Print the working directory of a process */  

 top -b 1
/* Returns the process utilizing the most cpu and quits */  

Resource Management  

 /usr/bin/ldd [filename]
/* List the dynamic dependencies of executable files */  

 /usr/proc/bin/pmap pid
/* Report address space map a process occupies */  

Route Configuration  
 
route add net 128.50.0.0 128.50.1.6 1
/* Adds route to 128.50 network via 128.50.1.6 */  

 route delete net 128.50.0.0 128.50.1.6
/* Deletes route to 128.50 network */  

 route get [hostname]
/* Which interface will be used to contact hostname */  

 route monitor
/* Monitors traffic to the routes */  

 route flush
/* Removes all entries in the route table */  

Searching Items  

 egrep "patterna|patternb" <filename>
/* Search for multiple patterns within the same file */  

 find . -exec egrep -li "str" {} \;
/* Find a string in files starting cwd */  

 find / -fstype nfs -prune -o fstype autofs -prune -o -name filename -print
/* Find without traversing NFS mounted file systems */  

 find . -mtime -1 -type f
/* Find recently modified files */  

 find / -mtime <# of days>
/* Find files modified during the past # of days */  

 find . ! -mtime -<days> | /usr/bin/xargs rm -rf
/* Finds and removes files older than <days> specified */  

 find . -type f -exec grep "<sub-string>" {} \; -print
/* Find files containing <sub-string> within directory tree */  

 find . -type f -print | xargs grep -i [PATTERN]
/* Recursive grep on files */  

 find / -user <username>
/* Find all files owned by <username> */  

 find / | grep [file mask]
/* Fast way to search for files */  

 find <start_path> -name "<file_name>" -exec rm -rf {} \;
/* Recursively finds files by name and automatically removes them */  

 find /proc/*/fd -links 0 -type f -size +2000 -ls
/* Find large files held open by a process */  

 ls -lR | grep <sub_string>
/* Fast alternative to find */  

Security  

 echo 'Please go away' > /etc/nologin
/* Stops users logging in */  

 find / -perm -0777 -type d -ls
/* Find all your writable directories */  
 find / -type f -perm -2000 -print
/* Find all SGID files */  

 find / -type f -perm -4000 -print
/* find all SUID files */  

Set Terminal Options  
 
stty erase ^H
/* Sets the Backspace Key to erase */  

 stty erase ^?
/* Sets the Delete Key to erase */  

 stty sane
/* Rreset terminal after viewing a binary file. */  

 tput rmacs
/* Reset to standard char set */  

Snoop Your Network  

 snoop -d pcelx0
/* Watch all network packets on device pcelx0 */  

 snoop -o /tmp/mylog pcelx0
/* Saves packets from device pcelx0 to a file */  

 snoop -i /tmp/mylog host1 host2
/* View packets from logfile between host1 & host2 */  

 snoop -i /tmp/mylog -v -p101
/* Show all info on packet number 101 from a logfile */  

 snoop -i /tmp/mylog -o /tmp/newlog host1
/* Write a new logfile with all host1 packets */  

 snoop -s 120
/* Return the first 120 bytes in the packet header */  

 snoop -v arp
/* Capture arp broadcasts on your network */  

Swap File  
 mkfile -v 10m /export/disk1/myswap
/* Makes a 10 Megabyte swapfile in /export/disk */  
 mkfile -nv 10m /export/disk1/myswap
/* Makes an empty 10 Megabyte swapfile */  

Swap Space  
 swap -s
/* List the amount of swap space available, also see mkfile */  

 swap -a /export/disk1/swapfile
/* Add a swapfile */  

 swap -d /dev/dsk/c0t0d0s4
/* Deletes a swap device */  

 swap -l
/* List the current swap devices */  

System Configuration  

 /usr/sbin/eeprom auto-boot? false
/* Changes eeprom autoboot? setting without going to Ok prompt */  

 /usr/sbin/eeprom diag-switch? true
/* Set the system to perform diagnostics on the next reboot. */  

 /usr/sbin/grpck
/* Check /etc/group file syntax */  

 /usr/sbin/pwck
/* Check /etc/passwd file syntax */  

 /usr/sbin/sys-unconfig
/* Clear host specific network configuration information */  

System Information and Monitoring  

 coreadm -e log
/* Report global core */  

 /bin/echo "0t${stamp}>Y\n<Y=Y" | adb
/* Convert UNIX timestamp to something human-readable */  

 /usr/sbin/eeprom
/* Show eeprom parameters */  

 grep "\-root" /var/adm/sulog | grep -v \+ | tail -25
/* List most recent attempts to switch to superuser account. */  

 isainfo -bv
/* Quickly checkout if machine is in 32 or 64 bit mode */  

 last
/* Tells who was or still is on the system */  

 logger -i
/* Log the process ID */  

 /usr/sbin/prtconf -vp
/* Show system configuration details */  

 /usr/platform/`/bin/uname -i`/sbin/prtdiag -v
/* System Diagnostics */  

 psrinfo | wc -l
/* Display number of processors */  

 sar -A <time in sec>
/* Provides cumulative system report. */  

 sar -a <time in sec>
/* Report use of file access system routines. */  

 sar -u
/* Report CPU Utilization */  

 uname -a
/* Displays system information */  

 vmstat 10
/* Displays summary of what the system is doing every 10 seconds */  
 
ypcat hosts | sort -n -t. +0 -1 +1 -2 +2 -3 +3 -4
/* Take the input of "ypcat hosts" or "cat /etc/inet/hosts" and sort by IP. */  

Hope you all remember those useful command !