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Montag, 30. November 2009

pinfo

Eingestellt von Sergey Guzenkov um Montag, November 30, 2009

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bits of knowledge of a sysadmin

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      • xsetroot -solid black
      • rpm --checksig; rpm -K
      • dhcpd.conf: shared-network {subnet {group { host }}}}
      • ex: %d ---delete all lines in a file
      • ex: 23,.m$ --move lines from 23 to the current lin...
      • pinfo
      • man -aw ls
      • man -d ls
      • when you get segmentation fault in yum: rm -f /var...
      • xorg.conf is missing: Xorg -configure :1
      • ex: := prints the total number of lines; :.= pri...
      • ex: 1,10# --display lines 1 to 10 and their respec...
      • for i in {0..110};do echo line $i;done
      • `xmonad --recompile` ---same as alt-q when xmonad ...
      • prevent overwrite of existing files: set -o noclob...
      • dd if=8.0-RELEASE-amd64-memstick.img of=/dev/da0 b...
      • tcpdump -i any
      • fedora installation mounts: /mnt/sysimage; /mnt/is...
      • nt: fsutil file createnew swap_device 536870912
      • distro upgrade: apt-get dist-upgrade; fedora: preu...
      • bash: repeat a command that contained foo ANYWHERE...
      • .bashrc: HISTFILE="~/.bash_history; HISTSIZE=10000
      • yum groupinstall "Moblin Desktop Environment"
      • vim: "1pu.u.u.u
      • winecfg; wine control; winefile; wine uninstaller;...
      • ports: dhcpd listens on UDP:67 and answers using U...
      • screen /dev/ttyS0
      • use output of one command as an argument of anothe...
      • reboot system every time user connects to the syst...
      • yum install yum-presto
      • grep 'a b' 44 ..
      • open file on the last line: vim + /var/log/message...
      • mysql_install_db --user=mysql; mysql_secure_instal...
      • Things to take with when going out:
      • chkconfig nscd on; nscd -i hosts; ipconfig /flushdns
      • for i in {1..19}; do echo $i; done
      • PS1="\u@\h:\w\$"
      • query rpm with the specified m5sum: rpm --fileid n...
      • output and error redirection: myprogram 1>messages...
      • check the openssl on local port 995: openssl s_cli...
      • view changes to default configuration: dovecot -n;...
      • escape characters: ^] for telnet; ^A for GNU Scree...
      • rpm --nomd5 --nopgp
      • list package requerements: rpm -qR bash
      • list only documentation files of a package: rpm -q...
      • list only configuration files of a package: rpm -q...
      • remove package: rpm -e glibc-devel
      • force installation: rpm -i foo.rpm --nodeps
      • freshen file (do not install if such package is no...
      • install foreign package: alien -i package.rpm
      • simulate package installation: apt-get -s; rpm --test
      • download, but do not install: apt-get -d
      • list all installed packages, or in the example onl...
      • list files in a package: dpkg -L pkg_name
      • gzip -dc tarball.tar.gz|tar -xv ---option -c of gz...
      • mysql: /etc/my.cnf: skip-networking
      • which package owns the file: rpm -qf /file ; pacma...
      • ssh: ssh-copy-id user@target-machine
      • C: .c -> preprocessing (including files, etc) .i -...
      • vim: c/phrase_down_to_which_change ---combine sear...
      • quota: apt-get install quota quotatool; vim /etc/f...
      • asterisk: asterisk -cvvv ---if you don't have star...
      • asterisk: asterisk -rvvv: module reload chan_sip; ...
      • selinux: touch /.autorelabel;reboot --- if you can...
      • yum grouplist; yum groupinfo "development tools"
      • rpm: rpm --root root_directory -vv
      • rpm: rpm --showrc; /usr/lib/rmp/rpmrc ---default g...
      • selinux: setsebool -P allow_httpd_anon_write=1 ..
      • selinux: selinux port -l
      • selinux: semanage port -a -p udp -t ssh_port_t 115
      • postmap /etc/aliases ---after editing the file
      • postconf alias_maps
      • getent passwd sergey; getent group wheel
      • ssh-agent screen ; ssh-agent startx
      • bash: eval `ssh-agent`
      • awk 'END {print NR }' /etc/group ---shows the numb...
      • awk -F: '{if ($4 && $4!=$1) print $1}' /etc/group
      • bash: enable -a ---shows enables built-in commands...
      • nt: ipconfig /displaydns |more ; ipconfig /flushdns
      • hostapd.conf ..
      • ifcfg-eth: ..
      • dhclient.conf: send-hostname "sergey"
      • slaptest
      • openssl rsa -in slapd-key -pubout>slapd-key.out
      • awk -F: '{print $1}' /etc/passwd ---the same as ...
      • arptables, ebtables (for ethernet), iptables (for ...
      • wireless bridge configuration: /etc/network/interf...
      • ls -d .* ---list only hidden files
      • ls -L ---show i on the linked file, rather than th...
      • ls -1 ---show only 1 file per line
      • ls -S ---sort by size
      • ls -Q ---quote names (GNU extension);
      • sed: sed '1 i this is first line' file ---adds lin...
      • mysql postinstall: set password for root@localhost...
      • mysql: select user,host from mysql.user;
      • mysql: mysqladmin -u root shutdown
      • slapd.conf: loglevel 296 --- -1 all loging informa...
      • postfix: postconf -e "mynetworks = 192.168.1.0/24,...
      • host -t mx mail.ru
      • postfix: postconf -e "relayhost = mailhub.example....
      • mutt: set folder="imaps://username@example.com" se...
      • ssh: Host is anything and hostname is the real name
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Sergey Guzenkov
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