![]() ![]() ![]() Wasn’t acceptable to have passwd world readable if it contained hashes.The salt and result are stored in ASCII.The salt and the password is passed into a hash function (a one-way cryptographic algorithm).A random number is generated (called the salt).Originally passwd contained a user’s password information.File got it’s name because it originally contained passwords as well.User configuration stored in /etc/passwd.apt: Advanced Package Tool, for installing and configuring packages from online sources.dpkg: Debian package manager, for installing/removing/configuring packages.Contains compressed binary data and metadata.Used in Debian Linux and it’s derivatives such as Ubuntu and Knoppix.up2date: command line package manager that fetches packages from internet and resolves dependencies.rpm: command line package manager for installing/removing/configuring packages.Package format and manager created by Red Hat developers.Then copy into filesystem (make install).Usually comes in a compressed tar archive (.tar.gz or similar).Two primary methods of installing programs Quota – configure and display user quotas Basically a tab delimited file that contains the command line parameters you’d give to mount.For filesystems that should be mounted on boot every time, put them in /etc/fstab.Cannot umount if device is still being accessed (i.e.mount with no arguments displays list of mounted filesystems.Sometimes other files are used, like /var/spool/cron/*įifth is day of week (0-6, starting with Sun). ![]() Most use /etc/crontab as primary set of instructions.Linux systems uses the Cron system for time-based job scheduling.k: don’t really shutdown, just send message Runlevels 3 and 5 are the most common levels for day-to-day operations Runlevel 5 enable X11 graphical environment Each script takes a parameter for changing operation (start/stop/halt/reboot).Init works with run command (rc) scripts.$ĥ: Multiuser mode with networking and GUI If then cat /dev/null > /usr/openv/netbackup/bin/JOBS_24_backup fi NB_MASTER=`bpclntcmd Delete old log file if present. You can edit the substr line to include that. Note, NDMP Jobs are purposely excluded from this reporting as they are proven to be running more than 20 hours. ![]()
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