linux notes

<< Linux.Note>> 

generate a date folder. : 
yest=$(date --date='1 days ago' "+%Y%m%d")
mkdir -p /host2/$yest/impact




<<add>>/<<Del>>//<<edit>>//<<view>>

user useradd /userdel passwd / w ; lsof /mountPoint id UserName
/etc/skel ; /etc/login.defs ;  /etc/default/useradd whoami; w ; who 現時login
user2group gpasswd -a UserName GroupName; gpasswd -d; usermod -a -G Group1,Group2 UserName ;
sambaUser smbpasswd -a lsof /folerName
group groupadd / groupdel groupmod
file touch; echo > File mv , rm cat less more tail head
link ln -s /File LinkName vi (dd | yy p=paste) :f LineNum
copy yes | cp * /directory/all -rvf sed (f and r) lsof | grep -i DBF ;
seg lsattr ; ls -Z ; ll -S | -t
grep -i "TeXt" *; file; grep ^[^#] find; which; whereis ; 
fuser -k inf.* ; 
del find /host2/20120331/ -type f -iname *.bak -exec rm -i '{}' \;   ## delete *.bak case-insense and sub-dir
del find /polific/foxtemp -mtime +2 -exec rm {} \;  ## delete temp file 
split split -b  50k LargeFile.Name SplitFile.Name__    ## divide per 50k ;
comb cat SplitFile.Name__*>>LargeFile.Name ## combine it
zip tar -jvcf CompressFilename.tar directory/ --remove-file;   tar -jvxf CompressFilename.tar;
Folder mkdir rm / mv -fR chgrp; chown; ll -ald ; pwd ; ls -dlZ /folder
ln -s /Folder LinkName chcon -t samba_share_t /FolderName
mv /Source/Directory /Target; chmod 2770 /FolderName -fR chown  chattr 
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Disk lvcreate lvscan lvdisplay lvmdiskscan df -t ; df -ia  ; du -ch | grep total
vgcreate vgscan vgdisplay lvmvgchange -a y volgroup00   mke2fs  ##Format沒有警告
pvcreate pvscan pvdisplay pvs df -lH; du -ch --max-depth=1 fsck 
fdisk -l, tune2fs -l /dev/hda1; sfdisk -Sg iostat ; hdparm -Tt /dev/sda /dev/sdb, sync
Mem vmstat , free, sysctl -p | a
Lan /etc/sysconfig/network-scripts/ifcfg-eth0 | 1 ; ifconfig eth0:0 20.0.0.212 SecondIP
netstat -tlunp ## view connect ;  iptraf ; route -n; nmap -sT 127.0.0.1
netstat -tl ## view listen ; traceroute; nslookup -q=mx domain.com 
netstat -tlnp | grep dovecot ; tcpdump -i eth0 -nn host 20.0.0.243 ; tcpdump host 20.0.0.244
Processing nice , renice vmstat,pstree;top ; ps -aux ; killall -HUP rsync
Mount /etc/fstab umount mount -a mount
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System ldd cat /etc/issue ; uname -a ; hosts
Variable set Variable=value echo $PATH PS!=$'[\u@h \w]\$' ## haveSpace
cron chmod 300 /var/spool/cron/root , crontab -u username -e | -r | -l
backGround nohup command & at hh:mm <comand
command ; ctrl+z ; jobs ; bg 1
ssh ssh-keygen -t rsa scp /root/.ssh/id_rsa root@1.1.1.1:/root/.ssh/authorized_keys  ## chmod 700
Service chkconfig --level 2345 ServiceName on chkconfig --list
service prg restart /etc/services ## whichCanRun
yum install -y ProgramName telnet localhost 110
rpm -qa | grep squid 
samba /etc/samba/smb.conf testparm ; pdbedit -L ; smbtree, smbstatus
nfs /etc/exports 
email service sendmail stop ; /var/spool/mail = var/mail 
/etc/dovecont.conf; /usr/bin/fetchmail 
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Autoexec /etc/rc.local {ntpdate -s stdtime.gov.hk; hwclock --systohc; nohup ntop& } alias rename=mv;
Console > to >> < from | pipe  ! not * ? \ ;   # remark [ ] eg [!0-5] PS1=$'[\u@\H \A]\$'
SHortCut Ctrl+c cut word Ctrl+\ Ctrl+D InputStop Ctrl+Z TempStop  Ctrl+M  Enter
Ctrl+U erase this line Ctrl+? erase last word
du Ctrl+S Stop Screen display Ctrl+Q Resume Screen Display