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root login with bash

Anonymous (anonymous@undisclosed.example.com) — 2013-02-04T22:17:35+00:00

root login with bash On our systems, the root account is set to be a role, so you can't login as root, just su to root from an user which has the root role. Also, the root user has the bourne shell (/bin/sh), but working with /bin/bash is much easier. Using this command, you can directly log in as

Cleanup Packages

Anonymous (anonymous@undisclosed.example.com) — 2014-04-28T09:01:22+00:00

Cleanup Packages Purge uninstalled Packages If a package is removed, it is only uninstalled, but the configuration remains on the system. This is a good thing, as you are able to reinstall the package and have it configured with the old configuration. But if you want to cleanup this old stuff, you can ge a list of uninstalled (but not purged) packages with this command:

localeadm

Anonymous (anonymous@undisclosed.example.com) — 2013-03-01T20:58:12+00:00

localeadm The localeadm utility queries and configures Solaris locales through a command line interface. * man page: localeadm(1M) Preparation Check your Solaris Release with cat /etc/release and get a matching DVD or ISO image. If you're using an ISO image, you have to mount it (insert your path in the first line.

rmdir for OSX

Anonymous (anonymous@undisclosed.example.com) — 2015-11-25T09:43:44+00:00

rmdir for OSX The Finder on OSX creates .DS_Store files in the directories to store its settings. This makes removing directories from the command line quite complicated: $ rmdir test rmdir: test: Directory not empty $ rm test/.DS_Store $ /bin/rmdir test

DynDNS Updates without a Client

Anonymous (anonymous@undisclosed.example.com) — 2013-02-04T22:17:34+00:00

DynDNS Updates without a Client My new hosting provide Strato offers DynDNS. I was searching for a DynDNS client for my OpenSolaris Home Server, but a small bash script does the job as good as any other client. #! /bin/bash . ${HOME}/.dyndns.cfg DOMAINS=$(cat ${HOME}/.dyndns.domains) echo "$(date '+%Y-%m-%d %H:%M') $(basename $0)" for domain in ${DOMAINS}; do echo -n " ${domain} - " curl --silent --show-error --insecure --user ${LOGIN} "${UPDATE_URL}?hostname=${domain}" d…

Disable a Service

Anonymous (anonymous@undisclosed.example.com) — 2016-10-01T19:54:34+00:00

Disable a Service To disable a service: service stop update-rc.d enable|disable With systemd (starting with Debian 8): systemctl disable To (re)enable a service: update-rc.d enable|disable service stop

MacPorts

Anonymous (anonymous@undisclosed.example.com) — 2015-11-25T08:59:36+00:00

MacPorts List Ports list requested ports: port echo requested | cut -d ' ' -f 1 | uniq list installed ports: port -qv installed Housekeeping When ports are updated, the old port is only deactivated, not uninstalled: ... autoconf @2.69_2 autoconf @2.69_3 autoconf @2.69_5 ...

Setting the Timezone

Anonymous (anonymous@undisclosed.example.com) — 2013-03-08T10:45:00+00:00

Setting the Timezone The timezone is stored in the file /etc/timezone. Check the Timezone cat /etc/timezone Example: # cat /etc/timezone Europe/London Set the Timezone You can use vi: vi /etc/timezone Or set it directy: echo "Europe/Berlin" > /etc/timezone

Compare directories

Anonymous (anonymous@undisclosed.example.com) — 2018-09-19T12:34:39+00:00

Compare directories For each of the directories, generate a digest file: find DIR -type f -exec shasum {} + | LC_ALL=C sort -d -k 2 > shasums.txt It's important to use LC_ALL=C and the option -d of sort, to get compareable results on different machines.

Shell Script Variables

Anonymous (anonymous@undisclosed.example.com) — 2015-10-23T12:39:10+00:00

Shell Script Variables Last Character Get the last character of $a: ${a: -1} Remove Slash from the End of a Variable Remove a trailing slash from $a: a=${a%/} scripting bash sysadmin variable

Android Backup

Anonymous (anonymous@undisclosed.example.com) — 2013-04-24T12:11:00+00:00

Android Backup To backup your device, use this command. It will automatically insert the current date in the filename: adb backup -apk -shared -all -f $(date '+%Y-%m-%d').db If you are havong problems with the connection (“adb: unable to connect for backup

Oracle: Recovery Manager

Anonymous (anonymous@undisclosed.example.com) — 2013-03-01T20:24:52+00:00

Oracle: Recovery Manager Start Recovery Manager rman target / Delete Archive Logs Delete all archive logs but keep the last 45 days: DELETE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE -45'; To remove archive logs older than 3 days without prompting, e.g. via cron, after backup run:

Command Line Audio

Anonymous (anonymous@undisclosed.example.com) — 2013-03-10T21:06:49+00:00

Command Line Audio Change Mac Audio Volume from Command Line To change the audio volume from remote of my Mac at home, I needed a command line tool which I can use via ssh. I've found it here: OS X Daily - Change the system volume from the command line. It's as easy as sudo osascript -e "set Volume 10"

MySQL: Backup

Anonymous (anonymous@undisclosed.example.com) — 2013-02-04T22:17:25+00:00

MySQL: Backup Export a Database # set or replace the variables $USER, $PASS and $DB mysqldump --add-drop-table -u${USER} -p${PASS} ${DB} Export all Databases individually # set or replace the variables $USER and $PASS DATE_YMD=$(date "+%Y-%m-%d") DATABASES=$(mysql --batch -u${USER} -p${PASS} mysql --execute='show databases') for db in ${DATABASES} do mysqldump --add-drop-table -u${USER} -p${PASS} ${DB} > ${DB}_${DATE_YMD}.sql & bzip2 ${DB}_${DATE_YMD}.sql & # sleep 10 # option…

List Open Ports

Anonymous (anonymous@undisclosed.example.com) — 2017-04-13T20:11:34+00:00

List Open Ports To list the open ports together with the listening processes: netstat -tulpn Here is an example output: Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 695/sshd tcp6 0 0 :::22 :::* LISTEN 695/sshd udp 0 0 0.0.0.0:55872 …

Oracle: EXP

Anonymous (anonymous@undisclosed.example.com) — 2013-03-01T20:40:57+00:00

Oracle: EXP Export all Objects from an Account Enter the account name insteand of {user}. exp USERID=\'/ as sysdba\' FILE={user}.dmp FULL=N OWNER={user} admin exp oracle

Comapct Sparse Image

Anonymous (anonymous@undisclosed.example.com) — 2015-11-25T08:52:05+00:00

Comapct Sparse Image hdiutil compact your.sparseimage sysadmin cli apple mac osx

Cursor Size

Anonymous (anonymous@undisclosed.example.com) — 2016-07-12T09:43:10+00:00

Cursor Size To change the mouse cursor size in GNOME, use this command. Substitute the value 32 with your prefered size. gsettings set org.gnome.desktop.interface cursor-size 32 desktop gnome linux mouse cursor settings

Make your Mac feel at Home

Anonymous (anonymous@undisclosed.example.com) — 2015-11-25T08:53:11+00:00

Make your Mac feel at Home A small snippet from one of my scripts which tests whether your Mac is in the given (home) WLAN. # # Path to 'airport' executeable, as of Mac OS X 10.5. AIRPORT="/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport" # # Set this to your Home WLAN SSID (name): HOMESSID="mycastle" # # Get SSID info from 'airport' and search for $HOMESSID SSID=$(${AIRPORT} --getinfo | grep ' SSID:') SSID=$(echo ${SSID} | grep "^SSID: ${HOMESSID}\$")…

Disable Core Dumps

Anonymous (anonymous@undisclosed.example.com) — 2014-05-16T06:36:00+00:00

Disable Core Dumps To disable core dumps create a file /etc/security/limits.d/no_core_dumps with the content * hard core 0: echo '* hard core 0' > /etc/security/limits.d/no_core_dumps Based on the “Nix Craft” article Linux Disable Core Dumps. linux sysadmin admin config

Change Encoding with iconv

Anonymous (anonymous@undisclosed.example.com) — 2013-02-04T22:17:34+00:00

Change Encoding with iconv Convert Single File iconv -f iso-8859-1 -t utf-8 -o OUTPUT.txt INPUT.txt Converts INPUT.txt from iso-8859-1 to utf-8 and writes it to OUTPUT.txt. Convert All Files in a Directory for f in $(find . -type f) do iconv -f iso-8859-1 -t utf-8 -o ${f}_$$_TEMP ${f} \ && mv ${f}_$$_TEMP ${f} done

Install the Java-Plugin for Firefox

Anonymous (anonymous@undisclosed.example.com) — 2014-09-05T12:12:53+00:00

Install the Java-Plugin for Firefox To install the Java plugin for Firefox, you have to create a symlink from Firefox's plugin directory /usr/lib/firefox-addons/plugins/ to the file libnpjp2.so in the JRE's “lib” dir. sudo ln -s \ ${JAVA_HOME}/jre/lib/amd64/libnpjp2.so \ /usr/lib/firefox-addons/plugins/libnpjp2.so

Set a Mac's Hostname

Anonymous (anonymous@undisclosed.example.com) — 2015-11-25T08:53:23+00:00

Set a Mac's Hostname To set the permanent hostname, use the scutil utility (enter the desired hostname instead of the_hostname): sudo scutil --set HostName the_hostname Credits * mac osx cli sysadmin

pargs for Linux

Anonymous (anonymous@undisclosed.example.com) — 2014-04-28T09:01:02+00:00

pargs for Linux If you miss pargs from Solaris, then try this: ps eww -p linux sysadmin cli

Print Information about a Signature

Anonymous (anonymous@undisclosed.example.com) — 2015-01-29T09:15:04+00:00

Print Information about a Signature openssl pkcs7 -in signature.p7s -text -inform DER -print_certs -noout cryptography howto openssl security

Download a Server Certificate

Anonymous (anonymous@undisclosed.example.com) — 2015-02-11T14:42:38+00:00

Download a Server Certificate First, load the certificate chain from the server: openssl s_client -showcerts -connect www.example.org:443

SSH

Anonymous (anonymous@undisclosed.example.com) — 2015-11-30T12:09:18+00:00

SSH SSH with Public Key Authentication only /etc/ssh/sshd_config Make sure that your SSH config file (sshd_config) contains these settings: PubkeyAuthentication yes PasswordAuthentication no If you changed the config, make sure to restart sshd to activate ist: