UNIX Hints Hacks by Kirk Waingrow

By Kirk Waingrow

UNIX tricks & Hacks is designed to immediately present you thru elevated productiveness and pride with UNIX. every trace and/or hack presents genuine value--not only a checklist of seen tactics marked as secrets and techniques. examine UNIX management abilities you could observe day-by-day with UNIX workstations and servers. become aware of networking tips to make variations properly over the community. take on safeguard concerns corresponding to facing SuperUser bills, permissions, and vulnerabilities within the UNIX working procedure. advance a variety of how you can display screen the procedure logs and cargo averages, to help within the tuning, solving, and safeguard. additionally discover ways to upload, manage, and alter person debts in new methods, and enhance your dossier administration talents for enhancing, viewing, and executin. With UNIX tricks & Hacks you are going to search for from the studying and say, "I cannot wait to attempt that!"

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The only difference is that when the system comes back up, a check of the filesystems (fsck) doesn't get run. • telinit On systems that utilize multilevel init functions, you can use the telinit command to direct init to go to a specific run level. It follows the same procedures as shutdown; the only difference is that it does not notify users that the system is going down. It begins the shutdown process. • Power button, switch, or key The button on the outside of some systems performs differently among different vendors.

Instead of pulling the network cable from the interface, you can simply disable the interface. Again, this is not recommended, because so many other possible daemons are relying on the network being up. If NFS, DNS, or NIS/YP are running, the system can hang at certain times or lock up. There would also be problems with sendmail and remote sessions. Even though it appears that this pretty clumsy, there are times when it is effective. The UNIX command ifconfig takes the interface down in seconds.

It does not execute the shutdown script rc0. • reboot Like the halt command, this syncs the disks and stops any nonessential processes, too. However, reboot restarts the kernel that is loaded into memory by the PROM monitor. • fasthalt and fastboot These commands are identical to the halt and reboot commands. The only difference is that when the system comes back up, a check of the filesystems (fsck) doesn't get run. • telinit On systems that utilize multilevel init functions, you can use the telinit command to direct init to go to a specific run level.

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