To replace all occurances of "shtml" with "php" inside of all of the *.php files in a directory. $ perl -pi.bak -e 's/shtml/php/' *.php See: hacks.oreilly.com: Global Search and Replace with Perl for more examples. … [Read more...]
Largest files on a directory or partition
To see the 10 largest files on a directory or partition, use # du /partition or directory_name | sort -rn | head -- Dru genesis [at] istar [dot] ca From the FreeBSD fortune file. … [Read more...]
Recursively copy files and their permissions
# cd /oldir tar cf - . | (cd /newdir ; tar xf -) This is the best way to totally preserve a copy of a directory tree between the current directory and /newdir … [Read more...]
L.A. freeways top list of worst bottlenecks
Like this is a suprise to anyone living in Los Angeles. The interchange of Ventura Freeway US-101 and Interstate 405 ranked as America's worst highway bottleneck, according to a report issued Thursday by the American Highway Users Alliance, a Washington, D.C., lobbying group that presses Congress for more money for highway construction. Read the full story: L.A. freeways top list of worst bottlenecks … [Read more...]
Telnet Based Server Testing
These tips and tricks detail the command syntax necessary to test common services using a telnet client. Network and System administrators can attest to how invaluable these types of tests can be when troubleshooting a system. … [Read more...]
mrtgsql
I have just released version 0.1 of mrtgsql. mrtgsql - a MRTG to SQL logging and reporting tool for MRTG Copyright (c) 2004 Max Clark mrtgsql is composed of two programs: mrtgsql which inserts data from the MRTG .log files into a database, and mrtgreport which reports usage on the interfaces in total GB and the 95th percentile. Grab it from Github: mrtgsql … [Read more...]
Recover the root password on Solaris
Seeing that I have had to do this twice now this month, I figured I would post this brief HOWTO. 1. Use the software cd 1 of 2 to recover root password 2. Boot cdrom -s from ok prompt 3. mkdir /tmp/a 4. mount /dev/dsk/c0t0d0s0 /tmp/a 5. cd /tmp/a/etc 6. TERM=vt100; export TERM 7. vi shadow 8. Delete passwd entry (13 chars) in the line for root … [Read more...]
Stir the entropy pool in FreeBSD 4
Entropy is used by the random number generator on your system for things like SSL, SSH and GPG, put simply encryption. On FreeBSD 4 it is possible to increase the inputs to generate entropy for your system (usefull if you are generating a large GPG key over the network). 1. Find the irqs of devices on your system. # dmesg | grep irq pci0: at 29.0 irq 7 pci0: at 29.1 irq 11 pci0: at 29.2 irq 9 pci0: at 29.7 irq 11 em0: port 0xc000-0xc03f mem 0xe2000000-0xe201ffff irq 10 at device 5.0 on … [Read more...]
Make an ISO image
From How to make a bootable OpenBSD CD on www.shockley.net On a Unix machine with the files in /iso/openbsd/3.4 # mkisofs -v -r -l -L -T -J -V "OpenBSD-3.4" -A "OpenBSD v3.4-Release, Custom ISO, 2004-01-15." -b i386/cdrom34.fs -c boot.catalog -o openbsd-i386-3.4.iso -x openbsd-i386-3.4.iso /iso/openbsd/3.4/ On a Windows machine with the files in c:openbsd3.4 c:isotoolsmkisofs -v -r -T -J -V "OpenBSD-2.8" -b c:/openbsd/3.4/i386/cdrom34.fs -c boot.catalog -o c:/openbsd/openbsd-3.4.iso -x … [Read more...]
Passwordless Logons with SSH
Create your keypair: # ssh-keygen -t rsa Send the public key (~/.ssh/idrsa.pub) to the remote host. It is a plain text file. Store this in ~/.ssh/authorizedkeys on the remote host. If the file exists already, append it to the end of the file on a new line. Log out of the remote system. Try and log in. … [Read more...]